HD 60364-7-710:2012
(Main)Low-voltage electrical installations - Part 7-710: Requirements for special installations or locations - Medical locations
Low-voltage electrical installations - Part 7-710: Requirements for special installations or locations - Medical locations
Applies to electrical installations in medical locations so as to ensure safety of patients and medical staff. These requirements, in the main, refer to hospitals, private clinics, medical and dental practices, health care centres and dedicated medical rooms in the work place.
Errichten von Niederspannungsanlagen - Teil 7-710: Anforderungen für Betriebsstätten, Räume und Anlagen besonderer Art - Medizinisch genutzte Bereiche
Installations électriques à basse tension - Partie 7-710: Règles pour les installations ou emplacements spéciaux - Locaux à usages médicaux
Les prescriptions sont applicables à des installations électriques de locaux à usages médicaux afin d'assurer la sécurité des patients et du personnel médical. Ces prescriptions se réfèrent généralement à des hôpitaux, des cliniques privées, des cabinets médicaux et dentaires, des centres de soins et à des locaux médicaux sur des sites de travail.
Nizkonapetostne električne inštalacije - 7-710. del: Zahteve za posebne inštalacije ali lokacije - Medicinski prostori (IEC 60364-7-710:2002, spremenjen)
Posebne zahteve tega dela standarda HD 60364 se uporabljajo za električne inštalacije v medicinskih prostorih, da se zagotovi varnost pacientov in zdravniškega osebja. Te zahteve se nanašajo predvsem na bolnišnice, zasebne klinike, zdravstvene in zobozdravstvene ambulante, zdravstvene domove ter namenske medicinske prostore na delovnem mestu. Zahteve tega dela se ne uporabljajo za medicinsko električno opremo. Ta del se uporablja tudi za električne inštalacije v prostorih, namenjenih medicinskim raziskavam.
OPOMBA 1: Morda je treba spremeniti obstoječo električno inštalacijo v skladu s tem standardom,
kadar pride do spremembe rabe prostora. Posebna pozornost naj se nameni izvajanju kardioloških posegov
v obstoječih inštalacijah.
OPOMBA 2: Ta standard se lahko po potrebi uporablja tudi za veterinarske klinike.
OPOMBA 3: Za medicinsko električno opremo in medicinske električne sisteme glejte skupino standardov EN 60601.
OPOMBA 4: Paziti je treba, da druge inštalacije ne vplivajo negativno na inštalacije.
OPOMBA 5: Te zahteve se na primer uporabljajo za električne inštalacije za medicinske prostore v:
– bolnišnicah in klinikah (vključno z zasnovo zabojnika);
– sanatorijih in zdravstvenih klinikah;
– namenskih prostorih v domovih za starejše občane in oskrbo starostnikov, kjer so pacienti deležni zdravstvene oskrbe;
– medicinskih centrih, ambulantah in oddelkih, nezgodnih oddelkih;
– drugih ambulantnih ustanovah (industrijskih, športnih in drugih).
OPOMBA 6: Uporaba tega harmonizacijskega dokumenta ne izključuje upoštevanja nacionalnih predpisov.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST HD 60364-7-710:2012
01-maj-2012
1DGRPHãþD
SIST IEC 60364-7-710:2006
1L]NRQDSHWRVWQHHOHNWULþQHLQãWDODFLMHGHO =DKWHYH]DSRVHEQHLQãWDODFLMH
DOLORNDFLMH0HGLFLQVNLSURVWRUL ,(& VSUHPHQMHQ
Low-voltage electrical installations - Part 7-710: Requirements for special installations or
locations - Medical locations
Errichten von Niederspannungsanlagen - Teil 7-710: Anforderungen für spezielle
Installationen oder Standorte - Medizinische Standorte und zugehörige Bereiche
Installations électriques à basse tension - Partie 7-710: Règles pour les installations ou
emplacements spéciaux - Locaux à usages médicaux
Ta slovenski standard je istoveten z: HD 60364-7-710:2012
ICS:
11.020 0HGLFLQVNHYHGHLQ Medical sciences and health
]GUDYVWYHQRYDUVWYHQL care facilities in general
SULSRPRþNLQDVSORãQR
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST HD 60364-7-710:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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HARMONIZATION DOCUMENT
HD 60364-7-710
DOCUMENT D'HARMONISATION
March 2012
HARMONISIERUNGSDOKUMENT
ICS 29.020; 91.140.50
English version
Low-voltage electrical installations -
Part 7-710: Requirements for special installations or locations -
Medical locations
(IEC 60364-7-710:2002, modified)
Installations électriques à basse tension - Errichten von Niederspannungsanlagen -
Partie 7-710: Règles pour les installations Teil 7-710: Anforderungen für
ou emplacements spéciaux - Betriebsstätten, Räume und Anlagen
Locaux à usages médicaux besonderer Art -
(CEI 60364-7-710:2002, modifiée) Medizinisch genutzte Bereiche
(IEC 60364-7-710:2002, modifiziert)
This Harmonization Document was approved by CENELEC on 2012-01-09. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this
Harmonization Document at national level.
Up-to-date lists and bibliographical references concerning such national implementations may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.
This Harmonization Document exists in three official versions (English, French, German).
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. HD 60364-7-710:2012 E
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Foreword
This document (HD 60364-7-710:2012) consists of the text of IEC 60364-7-710:2002 prepared by IEC/TC 64
"Electrical installations and protection against electric shock", together with the common modifications
prepared by CLC/TC 64, "Electrical installations and protection against electric shock".
The following dates are fixed:
• latest date by which the document has to be
(dop) 2013-01-09
implemented at national level
by publication of an identical
national standard or by endorsement
• latest date by which the national standards conflicting
(dow) 2015-01-09
with the document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60364-7-710:2002 was approved by CENELEC as a European
Standard with common modifications.
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Introduction
The requirements of this part of HD 60364 supplement, modify or replace certain of the general requirements
as contained in Parts 1 to 6 of HD 60364.
The clause numbering following 710 are those of the corresponding parts or clauses from Parts 1 to 6 of
HD 60364. The absence of reference to a part or a clause means that Parts 1 to 6 of HD 60364 are
applicable.
In medical locations it is necessary to ensure the safety of patients likely to be subjected to the application of
ME (medical electrical) equipment. For every activity and function in a medical location, the particular
requirements for safety have to be considered. Safety can be achieved by ensuring the safety of the
installation and the safe operation and maintenance of ME equipment connected to it. The use of ME
equipment on patients undergoing critical care has called for enhanced reliability and safety of electrical
installations in hospitals so as to improve the safety and continuity of supplies which is met by application of
this Harmonization Document. Variations of this document to further enhance safety and reliability are
acceptable.
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710 Medical locations
710.1 Scope
The particular requirements of this part of HD 60364 apply to electrical installations in medical locations so
as to ensure safety of patients and medical staff. These requirements, in the main, refer to hospitals, private
clinics, medical and dental practices, health care centres and dedicated medical rooms in the work place.
The requirements of this part do not apply to ME equipment.
This part also applies to electrical installations in locations designed for medical research.
NOTE 1 It may be necessary to modify the existing electrical installation, in accordance with this standard, when a
change of utilization of the location occurs. Special care should be taken where intracardiac procedures are performed in
existing installations.
NOTE 2 Where applicable, this standard can also be used in veterinary clinics.
NOTE 3 For ME equipment and ME systems, refer to the EN 60601 series.
NOTE 4 Care should be taken that other installations should not impair the installations.
NOTE 5 These requirements concern, for example, electrical installations for medical locations in:
− hospitals and clinics (including container design);
− sanatoriums and health clinics;
− dedicated locations in homes for senior citizens and aged care, where the patients are subjected to medical care;
− medical centres, outpatients’ clinics and departments, casualty wards;
− other outpatients’ institutions (industrial, sports and others).
NOTE 6 The application of this Harmonization Document does not exempt to respect the national regulations.
710.2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 61439 (all parts), Low-voltage switchgear and controlgear assemblies (IEC 61439 series)
EN 60601 (all parts), Medical electrical equipment (IEC 60601 series)
EN 60601-1:2006, Medical electrical equipment – Part 1: General requirements for basic safety and
essential performance (IEC 60601-1:2005)
EN 61557-8:2007, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. –
Equipment for testing, measuring or monitoring of protective measures – Part 8: Insulation monitoring
devices for IT systems (IEC 61557-8:2007 + corr. May 2007)
EN 61557-9:2009, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or monitoring of protective measures – Part 9 : Equipment for insulation
fault location in IT systems (IEC 61557-9:2009)
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EN 61558-2-15:2001 + Corrigendum 2004, Safety of power transformers, power supply units and similar –
Part 2-15: Particular requirements for isolating transformers for the supply of medical locations
(IEC 61558-2-15:1999, mod.)
HD 60364-4-41:2007, Low-voltage electrical installations – Part 4-41: Protection for safety – Protection
against electric shock (IEC 60364-4-41:2005, mod.)
HD 60364-6:2007, Low voltage electrical installations – Part 6: Verification (IEC 60364-6:2006, mod.)
IEC 60364-5-53: 2001, Electrical installations of buildings – Part 5-53: Selection and erection of electrical
equipment – Isolation, switching and control
IEC 60364-5-55:2001, Electrical installations of buildings – Part 5-55: Selection and erection of electrical
equipment – Other equipment
710.3 Definitions
For the purposes of this document, the following terms and definitions apply.
710.3.1
medical location
location intended for purposes of diagnosis, treatment (including cosmetic treatment), monitoring and care of
patients
710.3.2
patient
living being (person or animal) undergoing a medical, surgical or dental procedure
[SOURCE: EN 60601-1:2006, 3.76]
Note 1 to entry: The person under treatment for cosmetic purposes may be considered, as far as this standard is
concerned, as a patient.
710.3.3
medical electrical equipment
ME equipment
electrical equipment having an applied part or transferring energy to or from the patient or detecting such
energy transfer to or from the patient and which is
a) provided with not more than one connection to a particular supply mains, and
b) intended by its manufacturer to be used
− in the diagnosis, treatment, or monitoring of a patient, or
− for compensation or alleviation of disease, injury or disability
Note 1 to entry: ME equipment includes those accessories as defined by the manufacturer that are necessary to
enable the normal use of the ME equipment.
[SOURCE: EN 60601-1:2006, 3.63]
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710.3.4
applied part
part of ME equipment that in normal use necessarily comes into physical contact with the patient for ME
equipment or an ME system to perform its function
[SOURCE: EN 60601-1:2006, 3.8]
710.3.5
group 0
medical location where no applied parts are intended to be used and where discontinuity (failure) of the
supply cannot cause danger to life
710.3.6
group 1
medical location where discontinuity of the electrical supply does not represent a threat to the safety of the
patient and where applied parts are intended to be used as follows:
− externally;
− invasively to any part of the body in locations outside of group 2 locations
710.3.7
group 2
medical location where applied parts are intended to be used in applications such as:
− intracardiac procedures; or
− vital treatments or surgical operations where discontinuity (failure) of the supply can cause danger to
patients
Note 1 to entry: An intracardiac procedure is a procedure whereby an electrical conductor is placed within the heart of
a patient or is likely to come into contact with the heart, such conductor being accessible outside the patient’s body. In
this context, an electrical conductor includes insulated wires such as cardiac pacing electrodes or intracardiac ECG
electrodes, or insulated tubes filled with conducting fluids.
710.3.8
medical electrical system
ME system
combination, as specified by its manufacturer, of items of equipment, at least one of which is
ME equipment to be inter-connected by functional connection or by use of a multiple socket-outlet
[SOURCE: EN 60601-1:2006, 3.64]
Note 1 to entry: The system includes those accessories which are needed for operating the system and are specified
by the manufacturer.
710.3.9
patient environment
any volume in which intentional or unintentional contact can occur between a patient and parts of the ME
equipment or ME system or between a patient and other persons touching parts of the
ME equipment or ME system
[SOURCE: EN 60601-1:2006, 3.79]
Note 1 to entry: For illustration see Figure 710A.
Note 2 to entry: This applies when the patients position is pre-determined, if not, all possible patient positions should
be considered.
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710.3.10
medical IT system
IT electrical system fulfilling specific requirements for medical applications
Note 1 to entry: These supplies are also known as medical isolated power supply systems.
710.3.11
main distribution board
distribution board in the building which fulfils all the functions of a main electrical distribution for the supplied
building area assigned to it and where the voltage drop is measured for operating the main safety service
710.30 Assessment of general characteristics
Add:
Allocation of group numbers and classification of safety services to a medical location shall be made in
agreement with the medical staff and the person(s) responsible for the medical safety. In order to determine
the classification of a medical location, it is necessary that the medical staff indicate which medical
procedures will take place within the location. Based on the intended use, the appropriate classification for
the location shall be determined.
NOTE 1 Classification of a medical location should be related to the type of contact between applied parts and the
patient, the threat to the safety of the patient that represents a discontinuity (failure) of the electrical supply, as well as
the purpose for which the location is used (Guidance on the allocation of a group number and classification of safety
services for medical locations is shown in Annex B).
NOTE 2 To ensure protection of patients from possible electrical hazards, additional protective measures need to be
applied in medical locations. The type and description of these hazards can vary according to the treatment being
administered. The purpose for which a location is to be used may justify areas with different classifications (group 0, 1 or
2) for different medical procedures.
NOTE 3 Applied parts are defined by the particular standards for ME equipment.
NOTE 4 The possibility that certain medical locations could be used for different purposes which necessitate a higher
group should be addressed by risk management.
710.31 Purposes, supplies and structure
710.312.2 Types of system earthing
Add:
The TN-C system is not allowed in medical locations and medical buildings downstream of the main
distribution board.
710.313 Power supply
710.313.101 General
In medical locations the distribution system should be designed and installed to facilitate the automatic
change-over from the main distribution network to the electrical safety source feeding essential loads
(according to HD 60364-5-56:2010).
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710.41 Protection for safety – Protection against electric shock
710.410.3 General requirements
710.410.3.5
The protective provisions "obstacles" and "placing out of reach" as specified in HD 60364-4-41:2007,
Annex B, shall not be applied.
710.410.3.6
The protective provisions "non-conducting location", "earth-free local equipotential bonding" and "electrical
separation for the supply of more than one item of current-using equipment" as specified in HD 60364-4-
41:2007, Annex C, shall not be applied.
710.411 Protective measure: automatic disconnection of supply
710.411.3 Requirements for fault protection (protection against indirect contact)
710.411.3.2 Automatic disconnection in case of a fault
710.411.3.2.1
Add:
Care shall be taken to ensure that simultaneous use of many items of equipment connected to the same
circuit cannot cause unwanted tripping of the residual current protective device (RCD).
In medical locations of group 1 and group 2, where RCDs are required, only type A or type B shall be
selected, depending on the possible fault-current arising.
710.411.3.2.5
Add:
In medical locations of group 1 and group 2, the following shall apply:
− for IT, TN and TT systems, the conventional touch voltage U shall not exceed 25 V a.c. (U ≤ 25 V a.c.)
L L
or 60 V d.c. (U ≤ 60 V d.c.)
L
NOTE In the TN system 25 V a.c. (U ≤ 25 V a.c.) or 60 V d.c. (U ≤ 60 V d.c.) can be met with an additional
L L
equipotential bonding, by complying with the disconnection time in accordance with the general standard.
710.411.3.3
Where a medical IT system is used for protective measure 411.3.3 is not applicable.
710.411.4 TN system
Add:
In final circuits of group 1 rated up to 32 A residual current protective devices with a rated residual operating
current not exceeding 30 mA shall be used.
In medical locations of group 2 (except for the medical IT system) protection by automatic disconnection of
supply by means of residual current protective devices with a rated residual-operating current not exceeding
30 mA shall only be used on the following circuits:
− circuits for the supply of movements of fixed operating tables;
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NOTE 1 If the power consumption is less than 1 kVA, it could be connected to an ME IT system for touch voltage
reasons. Higher power consumption is acceptable, if the maximum touch voltage in the case of a first insulation fault will
be less than 10 mV.
− circuits for X-ray units;
NOTE 2 The requirement is mainly applicable to mobile X-ray units brought into group 2 locations.
− circuits for large equipment with a rated power greater than 5 kVA;
It is recommended that TN-S systems are monitored to ensure the insulation level of all live conductors
NOTE 3 A reduced insulation level of all live conductors should be reported to technical staff.
710.411.5 TT system
Add:
In medical locations of group 1 and group 2 residual current protective devices shall be used as
disconnection devices and the requirements of TN systems (see 710.411.4) apply.
710.411.6 IT system
710.411.6.3.101 Medical IT system
Add:
In group 2 medical locations, the medical IT system shall be used for final circuits supplying
ME equipment and ME systems intended for life support, surgical applications and other electrical equipment
located in the “patient environment” or that may be moved into the "patient environment", excluding
equipment listed in 710.411.4.
For each group of rooms serving the same function, at least one separate medical IT system is necessary.
The medical IT system shall be equipped with an insulation monitoring device (IMD) in accordance with
Annex A and Annex B of EN 61557-8:2007.
For each medical IT system, an acoustic and visual alarm system incorporating the following components
shall be arranged at a suitable place so that it can be permanently monitored (audible and visual signals) by
the medical staff and the technical staff:
− a green signal lamp to indicate normal operation;
− a yellow signal lamp which lights when the minimum value set for the insulation resistance is reached. It
shall not be possible for this light to be cancelled or disconnected;
− an audible alarm which sounds when the minimum value set for the insulation resistance is reached.
This audible alarm may be silenced;
− the yellow signal shall go out on removal of the fault and when the normal condition is restored.
NOTE 1 A written explanation should be easily readable in the medical location and it should include: the meaning of
each type of signalisation, alarm and the procedures to be followed in case of a first fault.
Monitoring of overload and high temperature for transformers for medical IT systems is required.
NOTE 2 When the IMD is designed for monitoring overload and temperature, it should be in accordance with Annex B of
EN 61557-8:2007.
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The equipment for insulation fault location which localizes insulation faults in any part of the medical IT
system may also be installed in addition to an insulation monitoring device.
The insulation fault location equipment shall be in accordance with EN 61557-9.
710.411.7 Functional extra-low voltage (FELV)
In medical locations functional extra-low voltage (FELV) is not permitted.
710.414 Protective measures: extra-low-voltage provided by SELV and PELV
710.414.1 General
Add:
When using SELV and/or PELV circuits in medical locations of group 1 and group 2, the nominal voltage
applied to current-using equipment shall not exceed 25 V r.m.s. a.c. or 60 V ripple free d.c. Protection by
basic insulation of live parts according to HD 60364-4-41:2007, Clause A.1 or by barriers or enclosures
according to HD 60364-4-41:2007, Clause A.2 shall be provided.
710.414.4.1
Add:
In medical locations of group 2, where PELV is used, exposed-conductive-parts of equipment (e.g. operating
theatre luminaries) shall be connected to the protective bonding conductor.
710.415.2 Additional protection: supplementary protective equipotential bonding
710.415.2.1
Add:
In each medical location of group 1 and group 2, supplementary protective equipotential bonding shall be
installed and the supplementary protective bonding conductors shall be connected to the equipotential
bonding busbar for the purpose of equalizing potential differences between the following parts, which are
located or which may be moved into the “patient environment”:
− protective conductors;
− extraneous-conductive-parts;
− screening against electrical interference fields, if installed;
− connection to conductive floor grids, if installed;
NOTE 1 If, due to floor grid connection to the supplementary equipotential bonding, an earth loop is formed, the
connection may be disregarded.
− metal screens of isolating transformers, via the shortest way to protective earthing conductor.
A sufficient number of supplementary equipotential bonding connection points for the connection of ME
equipment shall be available in group 2 and are recommended in group 1 (see also 710.30).
NOTE 2 Fixed conductive non-electrical patient supports such as operating theatre tables, physiotherapy couches and
dental chairs should be connected to the equipotential bonding conductor unless they are intended to be isolated from
earth.
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710.415.2.2
Add:
In medical locations of group 1 the resistance of the protective conductors, including the resistance of the
connections, between the terminals for the protective conductor of socket-outlets and of fixed equipment or
any extraneous-conductive-parts and the equipotential bonding bus bar, shall not exceed 0,7 Ω.
NOTE 1 National regulations ensuring equivalent safety may apply.
In medical locations of group 2, the resistance of the protective conductors, including the resistance of the
connections, between the terminals for the protective conductor of socket-outlets and of fixed equipment or
any extraneous-conductive-parts and the equipotential bonding bus bar shall not exceed 0,2 Ω.
NOTE 2 National regulations ensuring equivalent safety may apply.
Add:
710.415.2.101
The equipotential bonding shall be located in or near the medical location and it shall be connected to the
main protective earth conductor with a conductor having a cross sectional area equivalent to the larger cross
sectional area of the conductors connected with the equipotential bonding. Connections shall be so arranged
that they are accessible, labelled, clearly visible and that they can easily be disconnected individually.
NOTE 1 It is recommended to use star-shaped or tree-shaped wiring and to avoid “earth-loops”.
NOTE 2 For rooms used for intracardiac procedures special national requirements to isolate the equipotential bonding
bus bar may apply.
710.42 Protection for safety – Protection against thermal effects
710.422 Precautions where particular risks of fire exist
Add:
National legislation providing additional requirements may exist.
710.44 Protection for safety – Protection against voltage disturbances and electromagnetic
disturbances
710.444 Measures against electromagnetic disturbances
Add:
Special considerations shall be made concerning electromagnetic interference and electromagnetic
compatibility. Further information is provided in Annex C.
710.51 Selection and erection of electrical equipment – Common rules
710.510.101 Distribution boards
Distribution boards shall be in accordance with EN 61439 series.
Distribution boards for group 2 shall be installed in close proximity to the group 2 medical locations and shall
be clearly identifiable.
NOTE 1 Dedicated distribution boards should be provided for the general power supply and the safety power system.
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NOTE 2 Distribution boards should preferably be installed outside medical locations and should be safely guarded
against unauthorized persons.
NOTE 3 A distribution board for medical location is a board which fulfils all the functions for the supplied medical
location area assigned to it and where the voltage is monitored for operating the safety power system.
710.510.102 Electrical operating areas
Where electrical operating areas are arranged, national regulations prevail. If no national regulations are
available the following arrangements, if any, shall each be accommodated in their own enclosed electrical
operating areas:
− main transformer;
− switching stations with nominal voltages above 1 kV;
− main distributor for the general power supply;
− main distributor for the safety power supply;
− stationary generating set for the safety power supply;
− central batteries for the safety power supply, if the type of construction requires accommodation in an
enclosed electrical operating area, as well as converter and control cabinets for the additional safety
power supply.
See also 710.422.
710.512 Operational conditions and external influences
710.512.1 Operational conditions
710.512.1.101 Transformers for medical IT systems
Transformers shall be in accordance with EN 61558-2-15 with the following additional requirements.
The transformer shall be installed in close proximity to the medical location.
NOTE 1 A maximum distance for example of 25 m between the output terminals of the transformer and current using
equipment is strongly recommended.
The leakage current of the output winding to earth and the leakage current of the enclosure, when measured
in no-load condition and the transformer supplied at rated voltage and rated frequency, shall not exceed
0,5 mA.
At least one single-phase transformer per medical location or functional group of medical locations shall be
used to form the medical IT systems for portable and fixed equipment. The rated output shall not be less
than 0,5 kVA and shall not exceed 10 kVA. Where several transformers are needed to supply equipment in
one medical location, they shall not be connected in parallel.
NOTE 2 However, if national requirements allow a three-phase transformer to be applied for the supply of single-
phase loads, the construction or the method of connection should be such, that no voltage increase can occur on the
load side, not even in case of unbalanced load and other possible faults on the primary side. Under these conditions
three-phase transformers with secondary windings in either star or delta are acceptable.
If the supply of three-phase loads via an IT system is also required, a separate three-phase transformer shall
be provided for this purpose.
For monitoring see 710.411.6.3.101.
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No capacitors shall be used in transformers for medical IT systems.
NOTE 3 National specifications may apply, e.g. distinction between supply of final circuits for several socket-outlets
and supply of final circuits for a single item of equipment.
710.512.1.102 Power supply for medical locations of group 2
In case of a single fault of supply, a total loss of power in a group 2 medical location shall be prevented.
NOTE Regardless of the implementation of a medical IT system and management of the total selectivity of the
protection devices, this may be achieved by either
− provision of two independent supply lines (see also 710.536.101), or
− provision of a ring-structure, capable to backup the mains supply, or
− a local additional power supply unit, or
− an additional power supply unit for several rooms of group 2, or
− other equally effective technical measures to ensure the continuity of mains power.
710.512.2 External influences
NOTE Where appropriate, attention should be given to the prevention of electromagnetic interference (see Annex C).
710.512.2.1 Explosion risk
National legislation providing additional requirements may exist.
NOTE 1 Requirements for ME equipment for use in conjunction with flammable gases
...
SLOVENSKI STANDARD
oSIST prHD 60364-7-710:2008
01-september-2008
(OHNWULþQHLQãWDODFLMH]JUDGEGHO =DKWHYH]DSRVHEQHLQãWDODFLMHDOL
ORNDFLMH0HGLFLQVNLSURVWRUL ,(& VSUHPHQMHQ
Low-voltage electrical installations - Part 7-710: Requirements for special installations or
locations - Medical locations
Errichten von Niederspannungsanlagen - Teil 7-710: Anforderungen für spezielle
Installationen oder Standorte - Medizinische Standorte und zugehörige Bereiche
Installations électriques à basse tension - Partie 7-710: Règles pour les installations ou
emplacements spéciaux - Locaux à usages médicauxx
Ta slovenski standard je istoveten z: prHD 60364-7-710:2008
ICS:
29.020 Elektrotehnika na splošno Electrical engineering in
general
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
oSIST prHD 60364-7-710:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prHD 60364-7-710:2008
DRAFT
HARMONIZATION DOCUMENT
prHD 60364-7-710
DOCUMENT D'HARMONISATION
June 2008
HARMONISIERUNGSDOKUMENT
ICS 29.020; 91.140.50
English version
Low-voltage electrical installations -
Part 7-710: Requirements for special installations or locations -
Medical locations
(IEC 60364-7-710:2002, modified)
Installations électriques à basse tension - Errichten von Niederspannungsanlagen -
Partie 7-710: Règles pour les installations Teil 7-710: Anforderungen für spezielle
ou emplacements spéciaux - Installationen oder Standorte -
Locaux à usages médicaux Medizinische Standorte und zugehörige
(CEI 60364-7-710:2002, modifiée) Bereiche
(IEC 60364-7-710:2002, modifiziert)
This draft Harmonization Document is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2008-10-17.
The text of this draft consists of the text of IEC 60364-7-710:2002 with common modifications prepared by
CLC/SC 64A.
If this draft becomes a Harmonization Document, CENELEC members are bound to comply with the
CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization
Document on a national level.
This draft Harmonization Document was established by CENELEC in three official versions (English, French,
German).
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Warning : This document is not a Harmonization Document. It is distributed for review and comments. It is
subject to change without notice and shall not be referred to as a Harmonization Document.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 2282 Ref. No. prHD 60364-7-710:2008 E
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prHD 60364-7-710:2008 – 2 –
1 Foreword
2 The text of the International Standard IEC 60364-7-710:2002, prepared by IEC TC 64, Electrical
3 installations and protection against electric shock, together with the common modifications prepared
4 by WG 710 of SC 64A, Electrical installations and protection against electric shock – Protection
5 against electric shock, of Technical Committee CENELEC TC 64, Electrical installations and protection
6 against electric shock, is submitted to the CENELEC enquiry (4MP) for acceptance as a
7 Harmonization Document.
8 __________
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9 Text of prHD 60364-7-710
10 Introduction
11 The requirements of this part of HD 60364 supplement, modify or replace certain of the general
12 requirements as contained in Parts 1 to 6 of HD 60364.
13 The clause numbering following 710 are those of the corresponding parts or clauses from Parts 1 to 6
14 of HD 60364. The absence of reference to a part or a clause means that Parts 1 to 6 of HD 60364 are
15 applicable.
16 Clauses, subclauses, notes, tables and figures which are additional to those in IEC 60364-7-710:2002
17 are prefixed “Z”.
18 In medical locations it is necessary to ensure the safety of patients likely to be subjected to the
19 application of medical electrical equipment. For every activity and function in a medical location,
20 the particular requirements for safety have to be considered. Safety can be achieved by ensuring the
21 safety of the installation and the safe operation and maintenance of medical electrical equipment
22 connected to it. The use of medical electrical equipment on patients undergoing intensive care
23 (of critical importance) has called for enhanced reliability and safety of electrical installations in
24 hospitals so as to improve the safety and continuity of supplies which is met by application of this
25 Harmonization Document. Variations of this document to further enhance safety and reliability are
26 acceptable.
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27 710 Medical locations
28 710.1 Scope
29 The particular requirements of this part of HD 60364 apply to electrical installations in medical
30 locations so as to ensure safety of patients and medical staff. These requirements, in the main, refer
31 to hospitals, private clinics, medical and dental practices, health care centres and dedicated medical
32 rooms in the work place.
33 The requirements of this part do not apply to medical electrical equipment.
34 This part also applies to electrical installations in locations designed for medical research.
35 NOTE 1 It may be necessary to modify the existing electrical installation, in accordance with this standard, when a change of
36 utilization of the location occurs. Special care should be taken where intracardiac procedures are performed in existing
37 installations.
38 NOTE 2 Where applicable, this standard can also be used in veterinary clinics.
39 NOTE 3 For medical electrical equipment and medical electrical systems, refer to the EN 60601 series.
40 NOTE Z1 Care should be taken that other installations (e.g. data networks etc.) should not impair the installations. safety level.
41 NOTE Z2 These requirements concern, for example, electrical installations for medical locations in:
42 − hospitals and clinics (including container design);
43 − sanatoriums and health clinics;
44 − dedicated locations in homes for senior citizens and aged care, where the patients are subjected to medical care;
45 − medical centres, outpatients’ clinics and departments, casualty wards;
46 − other outpatients’ institutions (industrial, sports and others).
47 NOTE Z3 The application of this Harmonization Document does not exempt to respect the national rules.
48 710.2 Normative references
49 The following referenced documents are indispensable for the application of this document. For dated
50 references, only the edition cited applies. For undated references, the latest edition of the referenced
51 document (including any amendments) applies.
52 EN 60439 series, Low-voltage switchgear and controlgear assemblies (IEC 60439 series)
53 EN 60601 series, Medical electrical equipment (IEC 60601 series)
54 EN 60601-1:2006, Medical electrical equipment – Part 1: General requirements for basic safety and
55 essential performance (IEC 60601-1:2005)
56 EN 60601-1-1:2001, Medical electrical equipment – Part 1-1: General requirements for safety;
57 Collateral standard: Safety requirements for medical electrical systems (IEC 60601-1-1:2000)
1)
58 EN 61557-8:1997 , Electrical safety in low voltage distribution systems up to 1 000 V a.c. and
59 1 500 V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8:
60 Insulation monitoring devices for IT systems (IEC 61557-8:1997)
61 EN 61557-9, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -
62 Equipment for testing, measuring or monitoring of protective measures – Part 9 : Equipment for
63 insulation fault location in IT systems (IEC 61557-9)
———————
1) Will be superseded by EN 61557-8:2007, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8: Insulation monitoring devices for IT
systems (based on IEC 61557-8:2007) on 2010-05-01.
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64 EN 61558-2-15:2001, Safety of power transformers, power supply units and similar – Part 2-15:
65 Particular requirements for isolating transformers for the supply of medical locations
66 (IEC 61558-2-15:1999, mod.)
2)
67 HD 384.6.61 S2:2003 , Electrical installations of buildings – Part 6-61: Verification – Initial verification
68 (IEC 60364-6-61:1986, mod. + A1:1993, mod. + A2:1997, mod.)
69 HD 60364 series, Low-voltage electrical installations (IEC 60364 series, mod.)
70 HD 60364-4-41:2007, Low-voltage electrical installation – Part 4-41: Protection for safety – Protection
71 against electric shock (IEC 60364-4-41:2005, mod.)
72 IEC 60364-5-53, Electrical installations of buildings – Part 5-53: Selection and erection of electrical
73 equipment – Isolation, switching and control
74 IEC 60364-5-55:2001, Electrical installations of buildings – Part 5-55: Selection and erection of
75 electrical equipment - Other equipment
76 IEC 60670-24, Boxes and enclosures for electrical accessories for household and similar fixed
77 electrical installations – Part 24: Particular requirements for enclosures for housing protective devices
78 and similar power consuming devices
79 ISO 8528-1:2005, Reciprocating internal combustion engine driven alternating current generating
80 sets – Part 1: Application, ratings and performance
81 710.3 Definitions
82 For the purposes of this document, the following terms and definitions apply.
83 710.3.1
84 medical location
85 location intended for purposes of diagnosis, treatment (including cosmetic treatment), monitoring and
86 care of patients
87 710.3.2
88 patient
89 living being (person or animal) undergoing a medical, surgical or dental procedure
90 [EN 60601-1:2006, definition 3.76]
91 NOTE The person under treatment for cosmetic purposes may be considered, as far as this standard is concerned, as a
92 patient.
93 710.3.3
94 medical electrical equipment (ME equipment)
95 electrical equipment having an applied part or transferring energy to or from the patient or detecting
96 such energy transfer to or from the patient and which is
97 a) provided with not more than one connection to a particular supply mains, and
98 b) intended by its manufacturer to be used
99 − in the diagnosis, treatment, or monitoring of a patient, or
100 − for compensation or alleviation of disease, injury or disability
101 NOTE ME equipment includes those accessories as defined by the manufacturer that are necessary to enable the normal use
102 of the ME equipment.
103 [EN 60601-1:2006]
———————
2)
Will be superseded by HD 60364-6:2006, Low voltage electrical installations – Part 6: Verification (based on
IEC 60364-6:2006, mod.) on 2009-09-01.
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104 710.3.4
105 applied part
106 part of medical electrical equipment that in normal use necessarily comes into physical contact with
107 the patient for ME equipment or an ME system to perform its function
108 [EN 60601-1:2006, definition 3.8]
109 710.3.5
110 group 0
111 medical location where no applied parts are intended to be used and where discontinuity (failure) of
112 the supply cannot cause danger to life
113 710.3.6
114 group 1
115 medical location where discontinuity of the electrical supply does not represent a threat to the safety of
116 the patient and applied parts are intended to be used as follows:
117 − externally,
118 − invasively to any part of the body, except where 710.3.7 applies
119 710.3.7
120 group 2
121 medical location where applied parts are intended to be used in applications such as intracardiac
122 procedures, vital treatments and surgical operations where discontinuity (failure) of the supply can
123 cause danger to life
124 NOTE An intracardiac procedure is a procedure whereby an electrical conductor is placed within the heart of a patient or is
125 likely to come into contact with the heart, such conductor being accessible outside the patient’s body. In this context, an
126 electrical conductor includes insulated wires such as cardiac pacing electrodes or intracardiac ECG electrodes, or insulated
127 tubes filled with conducting fluids.
128 710.3.8
129 medical electrical system (ME system)
130 combination, as specified by its manufacturer, of items of equipment, at least one of which is medical
131 electrical equipment to be inter-connected by functional connection or by use of a multiple socket-
132 outlet
133 [EN 60601-1:2006, definition 3.64]
134 NOTE The system includes those accessories which are needed for operating the system and are specified by the
135 manufacturer.
136 710.3.9
137 patient environment
138 any volume in which intentional or unintentional contact can occur between a patient and parts of the
139 medical electrical equipment or medical electrical system or between a patient and other persons
140 touching parts of the medical electrical equipment or medical electrical system
141 [EN 60601-1:2006, definition 3.79]
142 NOTE 1 For illustration see Figure 710A.
143 NOTE 2 This applies when the patients position is pre-determined, if not, all possible patient positions should be considered.
144 710.3.10
145 medical IT system
146 IT electrical system fulfilling specific requirements for medical applications
147 NOTE These supplies are also known as isolated power supply systems.
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148 710.30 Assessment of general characteristics
149 Allocation of group numbers and classification of safety services to a medical location shall be made in
150 agreement with the medical staff and the authority responsible for safety. In order to determine the
151 classification of a medical location, it is necessary that the medical staff indicate which medical
152 procedures will take place within the location. Based on the intended use, the appropriate
153 classification for the location shall be determined.
154 NOTE 1 Classification of a medical location should be related to the type of contact between applied parts and the patient, as
155 well as the purpose for which the location is used (Guidance on the allocation of a group number and classification of safety
156 services for medical locations is shown in Annex B).
157 NOTE 2 To ensure protection of patients from possible electrical hazards, additional protective measures need to be applied in
158 medical locations. The type and description of these hazards can vary according to the treatment being administered. The
159 purpose for which a location is to be used may justify areas with different classifications (group 0, 1 or 2) for different medical
160 procedures.
161 NOTE 3 Applied parts are defined by the particular standards for medical electrical equipment.
162 NOTE 4 The possibility that certain medical locations could be used for different purposes which necessitate a higher group
163 should be addressed by risk management
164 710.31 Purposes, supplies and structure
165 710.312.2 Types of system earthing
166 The TN-C system is not allowed in medical locations and medical buildings downstream of the main
167 distribution board.
168 NOTE Main distribution board is a board in the building which fulfils all the functions of a main electrical distribution for the
169 supplied building area assigned to it and where the voltage drop is measured for operating the main safety service.
170 710.313 Power supply
171 710.313.1 General
172 In medical locations the distribution system should be designed and installed to facilitate the automatic
173 change-over from the main distribution network to the electrical safety source feeding essential loads
174 (according to IEC 60364-5-55:2001, Clause 556).
175 710.4 Protection for safety
176 710.41 Protection against electric shock
177 710.410.3 General requirements
178 Add:
179 Protection by insulation of live parts, according to HD 60364-4-41:2007, Clause A.1, or protection by
180 barriers or enclosures, according to HD 60364-4-41:2007, Clause A.2, are permitted.
181 NOTE Class II equipment is also permitted.
182 710.410.3.5
183 The protective measures "obstacles" and "placing out of reach" as specified in HD 60364-4-41:2007,
184 Annex B, shall not be applied.
185 710.410.3.6
186 The protective measures "non-conducting location", "earth-free local equipotential bonding" and
187 "electrical separation for the supply of more than one item of current-using equipment" as specified in
188 HD 60364-4-41:2007, Annex C, shall not be applied.
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189 710.411.3 Requirements for fault protection (protection against indirect contact)
190 710.411.3.2 Automatic disconnection in case of a fault
191 710.411.3.2.1
192 Add:
193 Care shall be taken to ensure that simultaneous use of many items of equipment connected to the
194 same circuit cannot cause unwanted tripping of the residual current protective device (RCD).
195 In medical locations of group 1 and group 2, where RCDs are required, only type A or type B shall be
196 selected, depending on the possible fault-current arising.
197 710.411.3.2.5
198 Add:
199 In medical locations of group 1 and group 2, the following shall apply:
200 − for IT, TN and TT systems, the conventional touch voltage U shall not exceed 25 V a.c.
L
201 (U ≤ 25 V a.c.) or 60 V d.c. (UL ≤ 60 V d.c.);
L
202 − for TN and IT systems, HD 60364-4-41:2007, Table 41.1, shall apply.
203 NOTE In the TN system 25 V a.c. (U ≤ 25 V a.c.) or 60 V d.c. (U ≤ 60 V d.c.) can be met with an additional equipotential
L L
204 bonding, by complying with the disconnection time in accordance with the general standard.
205 710.411.3.3
206 Where medical IT-System is used for protective measure this clause is not applicable.
207 710.411.4 TN system
208 In final circuits of group 1 rated up to 63 A residual current protective devices with a rated residual
209 operating current not exceeding 30 mA shall be used (this covers also additional protection).
210 In medical locations of group 2 protection by automatic disconnection of supply by means of residual
211 current protective devices with a rated residual-operating current not exceeding 30 mA may only be
212 used on the following circuits:
213 − circuits for the supply of operating tables;
214 − circuits for X-ray units;
215 NOTE 1 The requirement is mainly applicable to mobile X-ray units brought into group 2 locations.
216 − circuits for large equipment with a rated power greater than 5 kVA.
217 NOTE 2 It is recommended that TN-S systems are monitored to ensure the insulation level of all live conductors and that a
218 decrease should be reported to technical staff.
219 710.411.5 TT system
220 Add:
221 In medical locations of group 1 and group 2 residual current protective devices shall be used as
222 disconnection devices and the requirements of TN system (see 710.411.4) apply.
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223 710.411.6 IT system
224 710.411.6.3.1
225 Add:
226 In group 2 medical locations, the medical IT system shall be used for final circuits supplying medical
227 electrical equipment and systems intended for life support, surgical applications and other electrical
228 equipment located in the "patient environment", excluding equipment listed in 710.411.4.
229 For each group of rooms serving the same function, at least one separate medical IT system is
230 necessary. The medical IT system shall be equipped with an insulation monitoring device (IMD) in
231 accordance with EN 61557-8 with the following additional specific requirements:
232 − a.c. internal impedance shall be ≥ 100 kΩ;
233 − internal resistance shall be ≥ 250 kΩ;
234 − test voltage shall be ≤ 25 V d.c.;
235 − injected current, even under fault conditions, shall be ≤ 1 mA peak;
236 − indication shall take place at the latest when the insulation has decreased to 50 kΩ. If the
237 response value is adjustable, the lowest possible setpoint value shall be ≥ 50 kΩ. A test device
238 shall be provided;
239 − response and alarm-off time shall be ≤ 5 s.
240 NOTE 1 An indication is recommended if the protective earth (PE) or wiring connection of the IMD is lost.
241 NOTE 2 The necessary additional requirements on IMDs given above are at this time not covered in the equipment standard
242 EN 61557-8:1997. They will be removed from this publication as soon as they have been treated in the relevant equipment
243 standard.
244 NOTE 3 National regulations ensuring equivalent safety may apply.
245 For each medical IT system, an acoustic and visual alarm system incorporating the following
246 components shall be arranged at a suitable place so that it can be permanently monitored (audible
247 and visual signals) by the medical staff and furthermore is forwarded to the technical staff:
248 − a green signal lamp to indicate normal operation;
249 − a yellow signal lamp which lights when the minimum value set for the insulation resistance is
250 reached. It shall not be possible for this light to be cancelled or disconnected;
251 − an audible alarm which sounds when the minimum value set for the insulation resistance is
252 reached. This audible alarm may be silenced;
253 − the yellow signal shall go out on removal of the fault and when the normal condition is restored.
254 Monitoring of overload or high temperature for the medical IT-transformer is required. Monitoring of
255 both is recommended.
256 Fault location systems which localize insulation faults in any part of the medical IT system may also be
257 installed in addition to an insulation monitoring device.
258 The insulation fault location system shall be in accordance with EN 61557-9.
259 710.411.7 Functional extra-low voltage (FELV)
260 In medical locations functional extra-low voltage (FELV) is not permitted.
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261 710.414 Protective measures: extra-low-voltage provided by SELV and PELV
262 710.414.1 General
263 Add:
264 When using SELV and/or PELV circuits in medical locations of group 1 and group 2, the nominal
265 voltage applied to current-using equipment shall not exceed 25 V r.m.s. a.c. or 60 V ripple free d.c.
266 Protection by basic insulation of live parts according to HD 60364-4-41:2007, Clause A.1, and by
267 barriers or enclosures according to HD 60364-4-41:2007, Clause A.2, is essential.
268 710.414.4.1
269 Add:
270 In medical locations of group 2, where PELV is used, exposed-conductive-parts of equipment (e.g.
271 operating theatre luminaries), shall be connected to the protective bonding conductor.
272 710.415.2 Additional protection: supplementary protective bonding conductor
273 710.415.2.1
274 Add:
275 In each medical location of group 1 and group 2, supplementary protective equipotential bonding shall
276 be installed and the protective bonding conductors shall be connected to the equipotential bonding
277 busbar for the purpose of equalizing potential differences between the following parts, located in the
278 “patient environment”:
279 − protective conductors;
280 − extraneous-conductive-parts;
281 − screening against electrical interference fields, if installed;
282 − connection to conductive floor grids, if installed;
283 NOTE 1 If due to floor grid connection to the supplementary equipotential bonding an earth loop is formed, then the
284 connection may be disregarded.
285 − metal screens of isolating transformers, via the shortest way to PE-line.
286 A sufficient number of supplementary equipotential bonding connection points for the connection of
287 medical electrical equipment shall be available in group 2 and are recommended in group 1 (see also
288 710.30).
289 NOTE 2 Fixed conductive non-electrical patient supports such as operating theatre tables, physiotherapy couches and dental
290 chairs should be connected to the equipotential bonding conductor unless they are intended to be isolated from earth.
291 710.415.2.2
292 Replace the text by the following:
293 In medical locations of group 1, the resistance of the conductors, including the resistance of the
294 connections, between the terminals for the protective conductor of socket-outlets and of fixed
295 equipment or any extraneous-conductive-parts and the equipotential bonding bus bar shall not exceed
296 0,7 Ω.
297 NOTE National regulations ensuring equivalent safety may apply.
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298 In medical locations of group 2, the resistance of the conductors, including the resistance of the
299 connections, between the terminals for the protective conductor of socket-outlets and of fixed
300 equipment or any extraneous-conductive-parts and the equipotential bonding bus bar shall not exceed
301 0,2 Ω.
302 Add:
303 710.415.2.3
304 The equipotential bonding busbar shall be located in or near the medical location. Connections shall
305 be so arranged that they are accessible, labelled, clearly visible and can easily be disconnected
306 individually.
307 NOTE 1 It is recommended to use star-shaped or tree-shaped wiring and avoid ”earth-loops”.
308 NOTE 2 For rooms used for intracardiac procedures special national requirements to isolate the equipotential bonding bus bar
309 may apply.
310 710.422 Fire protection
311 National legislation providing additional requirements may exist.
312 710.444 Protection against electro-magnetic interferences (EMI) in installations of
313 buildings
314 NOTE Disturbances are not expected, if the magnetic induction B at 50 Hz is not exceeding the following values at the patient
315 position:
-7
316 − Btt = 1 • 10 Tesla for Electromyogram (EMG);
-7
317 − Btt = 2 • 10 Tesla for Electroencephalogram (EEG);
-7
318 − Btt = 4 • 10 Tesla for Electrocardiogram (ECG).
319 In general these limit values are not exceeded, if the following minimum distances in all directions are observed between
320 electrical equipment, which can cause magnetic disturbances, and the places of patient examination.
321 a) When foremost inductive equipment with large output is used, a distance of 6 m in general is sufficient.
322 Examples of such equipment:
323 − transformer of the electrical power installation, e.g. of the IT system;
324 − permanently installed motors, especially motors with nominal output exceeding 3 kW.
325 b) Between multi-strand cables and lines of the electrical power installation and patient positions to be protected:
Conductor cross section Min. distance
10 mm² to 70 mm² 3 m
95 mm² to 185 mm² 6 m
> 185 mm² 9 m
326 Larger distances may be required with single conductors. If there is a requirement to check the adherence of limit values, it is
327 recommended to commission experts.
328 See EN 50174-2 for additional information.
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329 710.5 Selection and erection of electrical equipment
330 710.51 Common rules
331 710.51.1 Distribution boards
332 Distribution boards shall be in accordance with EN 60439 series or IEC 60670-24.
333 Distribution boards for group 2 shall be installed in close proximity to the group 2 medical locations
334 and clearly identified.
335 NOTE 1 Dedicated distribution boards should be provided for the general power supply and the safety power system.
336 NOTE 2 Distribution boards should preferably be installed outside medically used locations and be safely guarded against
337 unauthorized persons.
338 NOTE 3 Distribution board for medical location is a board which fulfils all the functions for the supplied medical location area
339 assigned to it and where the voltage drop is measured for operating the safety power system, if it necessary.
340 710.51.2 Electrical operating areas
341 Where electrical operating areas are arranged, national regulations prevail. If no national regulations
342 are available the following arrangements shall each be accommodated in their own enclosed electrical
343 operating areas:
344 − main t
...
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