Electrical safety - Classification of interfaces for equipment to be connected to information and communications technology networks

No doa/dop/dow

Elektrische Sicherheit - Klassifizierung der Schnittstellen für den Anschluss von Geräten an Informations- und Kommunikationsnetze

Sécurité électrique - Classification des interfaces pour les matériels destinés à être connectés à des réseaux de traitement de l'information et de communication

Električna varnost – Klasifikacija vmesnikov za opremo, namenjeno priključevanju na omrežja z informacijsko in komunikacijsko tehnologijo (IEC/TR 62102:2005)

General Information

Status
Published
Publication Date
30-Jun-2006
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2006
Due Date
01-Jul-2006
Completion Date
01-Jul-2006

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SLOVENSKI STANDARD
SIST-TP CLC/TR 62102:2006
01-julij-2006
1DGRPHãþD
SIST-TP CLC/TR 62102:2005
(OHNWULþQDYDUQRVW±.ODVLILNDFLMDYPHVQLNRY]DRSUHPRQDPHQMHQRSULNOMXþHYDQMX
QDRPUHåMD]LQIRUPDFLMVNRLQNRPXQLNDFLMVNRWHKQRORJLMR ,(&75

Electrical safety - Classification of interfaces for equipment to be connected to

information and communications technology networks

Elektrische Sicherheit - Klassifizierung der Schnittstellen für den Anschluss von Geräten

an Informations- und Kommunikationsnetze

Sécurité électrique - Classification des interfaces pour les matériels destinés à être

connectés à des réseaux de traitement de l'information et de communication
Ta slovenski standard je istoveten z: CLC/TR 62102:2006
ICS:
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST-TP CLC/TR 62102:2006 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST-TP CLC/TR 62102:2006
---------------------- Page: 2 ----------------------
SIST-TP CLC/TR 62102:2006
TECHNICAL REPORT
CLC/TR 62102
RAPPORT TECHNIQUE
April 2006
TECHNISCHER BERICHT
ICS 35.020; 29.020 Supersedes CLC/TR 62102:2005
English version
Electrical safety –
Classification of interfaces for equipment
to be connected to information and communications
technology networks
(IEC/TR 62102:2005 )
Sécurité électrique – Elektrische Sicherheit –
Classification des interfaces Klassifizierung der Schnittstellen
pour les matériels destinés à être für den Anschluss von Geräten an
connectés à des réseaux de traitement Informations- und Kommunikationsnetze
(IEC/TR 62102:2005 )
de l'information et de communication
(CEI/TR 62102:2005 )
This Technical Report was approved by CENELEC on 2005-10-08.

CENELEC members are the national electrotechnical committees of Austria, Belgium, 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.
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

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. CLC/TR 62102:2006 E
---------------------- Page: 3 ----------------------
SIST-TP CLC/TR 62102:2006
CLC/TR 62102:2006 - 2 -
Foreword

The text of the Technical Report IEC/TR 62102:2005, prepared by IEC TC 108, Safety of electronic

equipment within the field of audio/video, information technology and communication technology, was

submitted to the formal vote and was approved by CENELEC as CLC/TR 62102 on 2005-10-08.

Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the Technical Report IEC/TR 62102:2005 was approved by CENELEC as a Technical

Report without any modification.
__________
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SIST-TP CLC/TR 62102:2006
- 3 - CLC/TR 62102:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

NOTE Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
Publication Year Title EN/HD Year
IEC 60950-1 2001 Information technology equipment – Safety EN 60950-1 2001
(mod) Part 1: General requirements
IEC 60950-21 2002 Information technology equipment - Safety EN 60950-21 2003
Part 21: Remote power feeding
---------------------- Page: 5 ----------------------
SIST-TP CLC/TR 62102:2006
---------------------- Page: 6 ----------------------
SIST-TP CLC/TR 62102:2006
TECHNICAL IEC
REPORT TR 62102
Second edition
2005-05
Electrical safety –
Classification of interfaces for equipment
to be connected to information and
communications technology networks
 IEC 2005  Copyright - all rights reserved

No part of this publication may be reproduced or utilized in any form or by any means, electronic or

mechanical, including photocopying and microfilm, without permission in writing from the publisher.

International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland

Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch

PRICE CODE
Commission Electrotechnique Internationale T
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
---------------------- Page: 7 ----------------------
SIST-TP CLC/TR 62102:2006
– 2 – TR 62102  IEC:2005(E)
CONTENTS

FOREWORD...........................................................................................................................3

INTRODUCTION.....................................................................................................................5

1 Scope...............................................................................................................................6

2 Normative references........................................................................................................6

3 Terms and definitions .......................................................................................................7

3.1 Definitions from IEC 60950-1 ...................................................................................7

3.2 Definitions from IEC 60950-21 .................................................................................9

3.3 Additional definitions for this document ....................................................................9

3.4 Abbreviations.........................................................................................................10

4 Reference configuration..................................................................................................10

5 Safety categories of interfaces provided for connection to an information and

communications technology network ...............................................................................13

5.1 SELV circuits.........................................................................................................13

5.2 TNV circuits...........................................................................................................13

5.3 User information ....................................................................................................13

5.4 RFT circuits...........................................................................................................13

6 Phenomena affecting the safety of interface ports ...........................................................13

6.1 Network Environment 0..........................................................................................14

6.2 Network Environment 1..........................................................................................14

7 Determination of circuit type............................................................................................15

Annex A (informative) Consideration of interface phenomenon .............................................16

Annex B (informative) Worked examples of certain network interfaces..................................19

Annex C (informative) Conditions for Network Environment 0................................................22

Annex D (informative) Voltage ranges of SELV circuits and TNV circuits...............................23

Bibliography ..........................................................................................................................24

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SIST-TP CLC/TR 62102:2006
TR 62102  IEC:2005(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICAL SAFETY –
CLASSIFICATION OF INTERFACES FOR EQUIPMENT
TO BE CONNECTED TO INFORMATION AND
COMMUNICATIONS TECHNOLOGY NETWORKS
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

The main task of IEC technical committees is to prepare International Standards. However, a

technical committee may propose the publication of a technical report when it has collected

data of a different kind from that which is normally published as an International Standard, for

example "state of the art".

IEC 62102, which is a technical report, was prepared by IEC technical committee 108: Safety

of electronic equipment within the field of audio/video, information technology and

communication technology, previously organized as IEC technical committee 74: Safety and

energy efficiency of IT equipment.

This second edition cancels and replaces the first edition published in 2001. This edition

constitutes a technical revision. The principal changes in this edition as compared with the first

edition of IEC 62102 are as follows (small changes are not listed):
− this 2nd edition was updated to accord with IEC 60950-1:2001;

− RFT (remote feeding telecommunication) circuits from IEC 60950-21 have been added;

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SIST-TP CLC/TR 62102:2006
– 4 – TR 62102  IEC:2005(E)
− in Annex B more interfaces have been added;
− in Annex B the category of xDSL interfaces have replaced ADSL interfaces.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
108/128/DTR 108/130/RVC

Full information on the voting for the approval of this technical report can be found in the report

on voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

Terms printed in bold in the text are defined in Clause 3.

The committee has decided that the contents of this publication will remain unchanged until the

maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this document may be published at a later date.
---------------------- Page: 10 ----------------------
SIST-TP CLC/TR 62102:2006
TR 62102  IEC:2005(E) – 5 –
INTRODUCTION

This technical report is a guide to the determination of the interface requirements for

equipment in terms of safety. It lists a number of interfaces and indicates the safety category of

each listed interface. This technical report does not contain sufficient detail for conformance

testing purposes, except when used in conjunction with product standards such as
IEC 60950-1 and IEC 60950-21.

The equipment safety standards IEC 60950-1 and IEC 60950-21 specify the requirements for

categories of circuits as SELV circuits, TNV circuits, RFT circuits and hazardous voltage

circuits (among others). For stand-alone equipment it is a relatively simple matter to determine

the different categories of circuits. However, an equipment which has data port interfaces is

intended to be connected to other equipment, either locally or via a network. In this case, the

safety categories of the interfaces which will be connected together have to be compatible with

each other. Furthermore, the category of the interface of the remote equipment may be

unknown. This is the case in systems where telecommunication equipment and data

processing equipment are connected together via different types of interfaces and networks.

To overcome this situation it is necessary to classify the interfaces of equipment in such

configurations according to the application and to select the safety category for the interfaces

of the equipment and for the type of the network. Similarly, the interfaces have to be classified

for protection against damage of the equipment and of the network. Aspects of protection are

dealt with in the ITU-T K series of recommendations.
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SIST-TP CLC/TR 62102:2006
– 6 – TR 62102  IEC:2005(E)
ELECTRICAL SAFETY –
CLASSIFICATION OF INTERFACES FOR EQUIPMENT
TO BE CONNECTED TO INFORMATION AND
COMMUNICATIONS TECHNOLOGY NETWORKS
1 Scope

This technical report applies to equipment interfaces. These interfaces within the equipment

may be connected to telecommunication networks, may form part of the telecommunication

network infrastructure or may provide localized transfer of data. This technical report provides

guidance on the classification of interfaces in accordance with the circuit types defined in

IEC 60950-1 and IEC 60950-21 following an analysis of the telecommunication network

characteristics.

This technical report only covers equipment appropriately interconnected. Furthermore, it does

not address damage caused by one equipment to another equipment to which it is connected.

Exceptionally, interfaces may be designed for higher or lower levels for special applications. In

such cases it should be ensured that only interfaces having the same safety category and

protection level are connected together. This is based on the available specifications of the

equipment manufacturers and network providers, and on information regarding the installation

category of the mains interface.

This technical report is intended to be used by equipment designers, network operators,

network regulators/authorities, standards writers and network installers. It is applicable to

various interfaces of equipment. Network presentations are not equipment and so are not

covered by IEC 60950-1 and IEC 60950-21; hence they are also not covered by this technical

report. However, it is necessary to consider the characteristics, installation and presentation of

telecommunication networks when determining what equipment interface requirements apply

(for example, SELV circuit, TNV-1 circuit, TNV-2 circuit, TNV-3 circuit etc.).

If a standard other than IEC 60950-1 or IEC 60950-21 is used for designing the equipment and

its interface (for example, IEC 62151 in conjunction with other product safety standards), then

the corresponding requirements of these other standards are to be preferred.

If there is a conflict between this technical report and a more detailed specification, the latter

prevails.

This technical report applies regardless of ownership or responsibility for installation and

maintenance of the equipment or network.

NOTE Terminal equipment is often connected to customer premises cabling when used in a business

environment, and there are standards covering such cabling.
2 Normative references

The following referenced documents are indispensable for the application of this document. For

dated references, only the edition cited applies. For undated references, the latest edition of

the referenced document (including any amendments) applies.

IEC 60950-1:2001, Information technology equipment – Safety – Part 1: General requirements

IEC 60950-21:2002, Information technology equipment – Safety – Part 21: Remote power

feeding
---------------------- Page: 12 ----------------------
SIST-TP CLC/TR 62102:2006
TR 62102  IEC:2005(E) – 7 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Definitions from IEC 60950-1
3.1.1
a.c. mains supply

a.c. power distribution system external to the equipment for supplying power to a.c. powered

equipment. These power sources include public or private utilities and, unless otherwise

specified in the standard, equivalent sources such as motor-driven generators and

uninterruptible power supplies
[IEC 60950-1, definition 1.2.8.1]
3.1.2
hazardous voltage

voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit which does not meet the

requirements for either a limited current circuit or a TNV circuit
[IEC 60950-1, definition 1.2.8.5]
3.1.3
limited current circuit

circuit which is so designed and protected that, under both normal operating conditions and

single fault conditions, the current which can be drawn is not hazardous
[IEC 60950-1, definition 1.2.8.8]
3.1.4
primary circuit

circuit which is directly connected to the a.c. mains supply. It includes, for example, the

means for connection to the a.c. mains supply, the primary windings of transformers, motors

and other loading devices
[IEC 60950-1, definition 1.2.8.3]
3.1.5
secondary circuit

circuit which has no direct connection to a primary circuit and derives its power from a

transformer, converter or equivalent isolation device, or from a battery
[IEC 60950-1, definition 1.2.8.4]
3.1.6
SELV circuit

secondary circuit which is so designed and protected that under normal operating conditions

and single fault conditions, its voltages do not exceed a safe value
[IEC 60950-1, definition 1.2.8.7]
3.1.7
TNV circuit (including TNV-1 circuit, TNV-2 circuit, TNV-3 circuit)

circuit that is in the equipment and to which the accessible area of contact is limited and that is

so designed and protected that, under normal operating conditions and single fault conditions,

the voltages do not exceed specified limit values
[IEC 60950-1, definition 1.2.8.10]
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SIST-TP CLC/TR 62102:2006
– 8 – TR 62102  IEC:2005(E)
3.1.8
telecommunication network

metallically terminated transmission medium intended for communication between equipment

that may be located in separate buildings, excluding:

– the mains system for supply, transmission and distribution of electrical power, if used as a

telecommunication transmission medium;
– cable distribution systems;
– SELV circuits connecting units of data processing equipment

NOTE 1 The term telecommunication network is defined in terms of its functionality, not its electrical

characteristics. A telecommunication network is not itself defined as being either an SELV circuit or a TNV

circuit. Only the circuits in the equipment are so classified.
NOTE 2 A telecommunication network may be:
– publicly or privately owned;

– subject to transient overvoltages due to atmospheric discharges and faults in power distribution systems;

– subject to longitudinal (common mode) voltages induced from nearby power lines or electric traction lines.

NOTE 3 Examples of telecommunication networks are:
– a public switched telephone network;
– a public data network;
– an Integrated Services Digital Network (ISDN);

– a private network with electrical interface characteristics similar to the above.

[IEC 60950-1, definition 1.2.13.8]
3.1.9
cable distribution system

metallically terminated transmission medium using coaxial cable, mainly intended for

transmission of video and/or audio signals between separate buildings or between outdoor

antennas and buildings, excluding:

– the mains system for supply, transmission and distribution of electric power, if used as a

communication transmission medium;
– telecommunication networks;
– SELV circuits connecting units of information technology equipment
NOTE 1 Examples of cable distribution systems are:

– local area cable networks, community antenna television systems and master antenna television systems

providing video and audio signal distribution;

– outdoor antennas including satellite dishes, receiving antennas, and other similar devices.

NOTE 2 Cable distribution systems may be subjected to greater transients than telecommunication networks.

[IEC 60950-1, definition 1.2.13.14]
3.1.10
service person

person having appropriate technical training and experience necessary to be aware of hazards

to which that person may be exposed in performing a task and of measures to minimize the

risks to that person or other persons
[IEC 60950-1, definition 1.2.13.5]
3.1.11
user
any person, other than a service person
[IEC 60950-1, definition 1.2.13.6]
---------------------- Page: 14 ----------------------
SIST-TP CLC/TR 62102:2006
TR 62102  IEC:2005(E) – 9 –
3.2 Definitions from IEC 60950-21
3.2.1
RFT circuit
remote feeding telecommunication circuit

a secondary circuit within the equipment, intended to supply or receive d.c. power via a

telecommunication network at voltages equal to or exceeding the limits for TNV circuits, and

on which overvoltages from telecommunication networks are possible
[IEC 60950-1, definition 3.1]
3.2.2
RFT-C circuit

an RFT circuit which is so designed and protected that under normal operating conditions and

single fault conditions, the currents in the circuit do not exceed defined values

[IEC 60950-1, definition 3.2]
3.2.3
RFT-V circuit

an RFT circuit which is so designed and protected that under normal operating conditions and

single fault conditions the voltages are limited and the accessible area of contact is limited

[IEC 60950-1, definition 3.3]
3.3 Additional definitions for this document
3.3.1
antenna interface
a port for connection of a radio frequency antenna to equipment
3.3.2
coaxial cable interface

a port for connection of a coaxial cable providing for asymmetrical transmission to equipment

NOTE In this technical report the use of both indoor and outdoor coaxial cables is considered separately.

3.3.3
network termination point

the physical point at the boundary of a network intended to accept the connection of a terminal

equipment or to be interconnected to another network
3.3.4
paired conductor interface

a port for connection of a cable providing for symmetrical transmission (for example, twisted

pair) to equipment

NOTE In this technical report the use of both indoor and outdoor twisted pair cables is considered separately.

3.3.5
terminal connection point

the physical point of the terminal equipment intended to be connected to a network

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SIST-TP CLC/TR 62102:2006
– 10 – TR 62102  IEC:2005(E)
3.4 Abbreviations

For the purposes of this technical report, the following abbreviations apply to Clause 4,

Annex B and Annex C:
ADSL Asymmetric Digital Subscriber Line
DLL Digital Local Line
DSL Digital Subscriber Line
ESD Electrostatic Discharge
HPNA Home Phone-Line Networking Architecture
ISDN Integrated Services Digital Network
KYBD Keyboard
LAN Local Area Network
LEPM Primary Multiplex
LPZ Lightning Protection Zone
LTU Line termination unit
NCP Network Connection Point
NO Network Operator
NT Network Termination
NTBA Network Termination, Basic Access
NTP Network Termination Point
NTU Network Terminating Unit
PABX Private Automatic Branch Exchange
PC Personal Computer
PCM Pulse Code Modulation
PNO Public Network Operator
POTS Plain Old Telephone Service
PSTN Public Switched Telephone Network
RFT Remote Feeding Telecommunication
RPS Remote Power Supply
RS Recommended Standard
SDH Synchronous Digital Hierarchy
TA Terminal Adapter
TCP Terminal Connection Point
TE Terminal Equipment
USB Universal Serial Bus
VGA Video Graphics Array
ZWRBA Regenerator, Basic Access
4 Reference configuration

Figure 1 illustrates a hypothetical configuration of "network clouds" giving examples of the

types of equipments covered by this technical report. Certain of these equipments will only

have one or two interface types, others may have many. Certain of the "network clouds" will be

elements within the PSTN (where the possibility of more than one network operator exists) and

others may be private networks. The equipment connected to this "network cloud" and part of

the "network cloud" itself can be any type covered by the scope of this technical report.

---------------------- Page: 16 ----------------------
SIST-TP CLC/TR 62102:2006
TR 62102  IEC:2005(E) – 11 –

This technical report provides a framework for safety requirements and protection levels by

reference to the particular examples given in Figures 1 and 2. Configurations not covered

should be treated using the same principles.
e.g. Analogue
e.g. Facsimile
PNO
telephones
machines
e.g. Digital
e.g. Network
telephones
transmission
e.g. PABX
equipment &
multiplexers
PNO
e.g. Modems
e.g. Network & switching
e.g. Terminal
equipment
e.g. Telephone
answering
machines
IEC 741/05
Figure 1 – Reference configuration

Where, in a practical situation, an equipment has two or more interfaces of different types, it is

normally necessary to provide safety separation within the equipment between those interfaces

in accordance with IEC 60950-1 and IEC 60950-21.

Figure 2 illustrates examples of possible network configurations. Included are some of the

network elements involved in such networks and an indication of the various commercial

organizations, both Public Network Operators (PNOs) and Network Operators (NOs) generally

(public or private) that are involved in providing network infrastructures to service the end

customer.
---------------------- Page: 17 ----------------------
SIST-TP CLC/TR 62102:2006
– 12 – TR 62102  IEC:2005(E)
Example 1
NTP2 TCP
NTP1
PNO
IEC 742/05
Example 2
NTP4 TCP
NTP1 NTP3
NTP2
PNO NO
NTU
IEC 743/05
Example 3
e.g. Analogue
NO 2
telephones
NT2
NT1
e.g. Basic
access ISDN
e.g. Digital
telephone
PABX
handsets
NT1
Public network
Public network
Street
Distribution
NO 1
Cabinet
frame
(e.g. multiplexer)
e.g. SDH Fibre,
e.g. ISDN
ISDN ‘U’, etc.
Primary rate
PNO 1
PNO 2
Customer’s building
IEC 744/05
Figure 2 – Examples of network configurations
---------------------- Page: 18 ----------------------
SIST-TP CLC/TR 62102:2006
TR 62102  IEC:2005(E) – 13 –
5 Safety categories of interfaces provided for connection to an information
and communications technology network

NOTE Both primary circuits and secondary circuits can be subject to transient overvoltages. Refer to

IEC 60950-1.
5.1 SELV circuits
The requirements for SELV circuits are as specified in IEC 60950-1.
5.2 TNV circuits

The requirements for TNV circuits are as specified in IEC 60950-1. TNV circuits are further

sub-divided into TNV-1 circuits, TNV-2 circuits and TNV-3 circuits, depending on their

nominal operating voltage and on the likelihood of their being subject to overvoltages.

5.3 User information
The safety classificat
...

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