Low-voltage electrical installations - Part 7-709: Requirements for special installations or locations - Harbours, marinas and similar locations - Special requirements for shore supply to ships

20170505: project on hold, waiting for TC to take a decision and provide new text for a homegrown amendment and not a revision

Errichten von Niederspannungsanlagen - Teil 7-709: Anforderungen für Betriebsstätten, Räume und Anlagen besonderer Art - Häfen, Marinas und ähnliche Bereiche - Besondere Anforderungen an die Versorgungseinrichtungen für den elektrischen Landanschluss von Schiffen

Installations électriques à basse tension - Partie 7-709 : Installations et emplacements spéciaux - Ports, marinas et emplacements analogues - Exigences spécifiques pour l'alimentation à quai des navires

Les exigences particulières spécifiées dans la présente partie de la série HD 60364 s’appliquent uniquement aux circuits destinés à l’alimentation des engins flottants utilisés pour les activités administratives, commerciales, industrielles, de loisir ou sportives, ci-après dénommés « navires », dans les ports, les ports de plaisance et les emplacements analogues. Les exigences particulières ne s’appliquent pas: - aux installations à terre destinées à l’alimentation des bateaux de navigation intérieure à des fins commerciales et administratives; NOTE 1 Les exigences s’appliquant à de telles installations sont définies dans le document HD 60364-7-730. - aux systèmes d’alimentation à quai destinés aux navires qui exigent de synchroniser leur production d'énergie avec l'alimentation du quai, pour prévenir tout black-out, NOTE 2 Les exigences s’appliquant à de telles installations sont définies dans l’IEC/ISO/IEEE 80005-3. - aux installations électriques à bord des navires; - à l’alimentation des péniches, quand elles sont directement alimentées depuis le réseau public de distribution; - à l’alimentation des navires au mouillage; - à l’alimentation des navires en cale sèche; - à l’alimentation des navires par des groupes électrogènes autonomes à terre. Pour le reste de l'installation électrique et les installations électriques des péniches, les exigences générales de la série HD 60364, ainsi que les exigences particulières pertinentes du document HD 60364-7, s’appliquent.

Nizkonapetostne električne inštalacije - 7-709. del: Zahteve za posebne inštalacije ali lokacije - Pristanišča, marine in podobne lokacije - Posebne zahteve za napajanje ladij z obale - Dopolnilo A12

General Information

Status
Published
Publication Date
08-Aug-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-Jul-2019
Due Date
29-Sep-2019
Completion Date
09-Aug-2019

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SLOVENSKI STANDARD
SIST HD 60364-7-709:2009/A12:2019
01-september-2019

Nizkonapetostne električne inštalacije - 7-709. del: Zahteve za posebne inštalacije

ali lokacije - Pristanišča, marine in podobne lokacije - Posebne zahteve za
napajanje ladij z obale - Dopolnilo A12

Low-voltage electrical installations - Part 7-709: Requirements for special installations or

locations - Harbours, marinas and similar locations - Special requirements for shore

supply to ships

Installations électriques à basse tension - Partie 7-709 : Installations et emplacements

spéciaux - Ports, marinas et emplacements analogues - Exigences spécifiques pour
l'alimentation à quai des navires
Ta slovenski standard je istoveten z: HD 60364-7-709:2009/A12:2019
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
93.140 Gradnja vodnih poti, Construction of waterways,
pristanišč in nasipov ports and dykes
SIST HD 60364-7-709:2009/A12:2019 en,fr

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

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SIST HD 60364-7-709:2009/A12:2019
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SIST HD 60364-7-709:2009/A12:2019
HARMONIZATION DOCUMENT HD 60364-7-709:2009/A12
DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT
April 2019
ICS 29.020; 91.140.50
English Version
Low-voltage electrical installations - Part 7-709: Requirements
for special installations or locations - Harbours, marinas and
similar locations - Special requirements for shore supply to ships

Installations électriques à basse tension - Partie 7-709: Errichten von Niederspannungsanlagen - Teil 7-709:

Exigences pour les installations et emplacements spéciaux Anforderungen für Betriebsstätten, Räume und Anlagen

- Ports, ports de plaisance et emplacements analogues - besonderer Art - Häfen, Marinas und ähnliche Bereiche -

Exigences spécifiques pour l'alimentation à quai des Besondere Anforderungen an die

navires Versorgungseinrichtungen für den elektrischen
Landanschluss von Schiffen

This amendment A12 modifies the Harmonization Document HD 60364-7-709:2009; it was approved by CENELEC on 2019-02-10.

CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of

this amendment 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 amendment 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. HD 60364-7-709:2009/A12:2019 E
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SIST HD 60364-7-709:2009/A12:2019
HD 60364-7-709:2009/A12:2019 (E)
Contents Page

European foreword ............................................................................................................................................ 4

Introduction ........................................................................................................................................................ 5

709.1 Scope .................................................................................................................................................. 6

709.2 Normative references .......................................................................................................................... 6

709.3 Terms and definitions .......................................................................................................................... 7

709.31 Purposes, supplies and structure ....................................................................................................... 9

709.312 Conductor arrangement and system earthing ................................................................................. 9

709.312.2 Types of system earthing ............................................................................................................. 9

709.312.2.1 TN-systems .................................................................................................................................. 9

709.313 Supplies ........................................................................................................................................... 9

709.4 Protection for safety ............................................................................................................................ 9

709.41 Protection against electric shock ......................................................................................................... 9

709.411.2 Requirements for basic protection ............................................................................................. 10

709.41.C.1 Non-conductive location ............................................................................................................. 10

709.41.C.2 Protection by earth-free local equipotential bonding ................................................................. 10

709.411.2 Requirements for basic protection ............................................................................................. 10

709.413 Protective measure by electrical separation .................................................................................. 10

709.5 Selection and erection of electrical equipment ................................................................................ 10

709.512 Operational conditions and external influences............................................................................. 10

709.512.2 External influences ..................................................................................................................... 10

709.512.2.1.1 Presence of water (AD) .......................................................................................................... 11

709.512.2.1.2 Presence of solid foreign bodies (AE) .................................................................................... 11

709.512.2.1.3 Presence of corrosive or polluting substances (AF) .............................................................. 11

709.512.2.1.4 Impact (AG) ............................................................................................................................ 11

709.513 Accessibility ................................................................................................................................... 11

709.513.1 General ...................................................................................................................................... 11

709.521 Types of wiring............................................................................................................................... 12

709.521.7 Wiring ......................................................................................................................................... 12

709.521.7.4 Underground cables ................................................................................................................... 13

709.521.7.5 Overhead cables or overhead insulated conductors ................................................................. 13

709.531 Devices for protection against indirect contact by automatic disconnection of supply.................. 13

709.531.2 Residual current protective devices (RCDs) .............................................................................. 13

709.533 Devices for protection against overcurrent .................................................................................... 13

709.536 Isolation and switching .................................................................................................................. 14

709.536.2 Isolation ...................................................................................................................................... 14

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HD 60364-7-709:2009/A12:2019 (E)

709.536.2.1 General ................................................................................................................................... 14

709.55 Other equipment................................................................................................................................ 14

709.55.1 Socket-outlets ................................................................................................................................ 14

709.55.1.1 General ...................................................................................................................................... 14

709.6 Maintenance ...................................................................................................................................... 15

709.8 Functional Aspects ............................................................................................................................ 15

709.8.1 Energy Efficiency ........................................................................................................................... 15

Annex A (informative) Ship connection .......................................................................................................... 16

Annex B (informative) Examples of supply ..................................................................................................... 17

Annex C (informative) Example of an instruction notice for a marina ............................................................ 21

Annex D (informative) Example of an instruction notice for the harbour master ............................................ 22

Annex ZA (normative) Special national conditions To be checked by NCs ................................................... 23

Annex ZB (informative) A-deviations .............................................................................................................. 25

Bibliography ..................................................................................................................................................... 26

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SIST HD 60364-7-709:2009/A12:2019
HD 60364-7-709:2009/A12:2019 (E)
European foreword

This document (HD 60364-7-709:2009/A12:2019) has been prepared by CLC/TC 64 “Electrical installations

and protection against electric shock”.
The following dates are fixed:
• latest date by which this document has (dop) 2020-02-10
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2022-02-10
standards conflicting with this 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 shall not be held responsible for identifying any or all such patent rights.

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SIST HD 60364-7-709:2009/A12:2019
HD 60364-7-709:2009/A12:2019 (E)
Introduction

The requirements of this part of HD 60364 series supplement, modify or replace certain of the general

requirements contained in other parts of HD 60364 series.

The clause numbering appearing after 709 refers to the corresponding parts or clauses of other Parts 1 to 6

of HD 60364. Numbering of clauses does not, therefore, necessarily follow sequentially. Numbering of

figures and tables takes the number of this part followed by a sequential number.

The absence of reference to a part or a clause means that the general requirements contained in other Parts

1 to 6 of HD 60364 are applicable.
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SIST HD 60364-7-709:2009/A12:2019
HD 60364-7-709:2009/A12:2019 (E)
709.1 Scope

The particular requirements specified in this part of the HD 60364 series apply only to circuits intended to

supply floating crafts used for administrative, commercial, industrial, leisure or sport activities, hereinafter

referred to as “ships”, in harbours, marinas and similar locations.
The particular requirements do not apply to:

— onshore installations dedicated to supply inland navigation vessels for commercial and administrative

purpose;
NOTE 1 Such requirements are defined in HD 60364-7-730.

— shore connection systems dedicated to ships that require, to prevent blackout, synchronisation of their

power generation with the shore power supply,
NOTE 2 Such requirements are defined in IEC/ISO/IEEE 80005-3.
— internal electrical installations of ships;

— the supply of houseboats when they are directly supplied from the public network;

— the supply of anchored ships;
— the supply of ships in dry docks;
— the supply of ships by on-shore stand-alone generating sets.

For the remainder of the electrical installation and for the electrical installations of houseboats, the general

requirements of HD 60364 series together with the relevant particular requirements of HD 60364-7 apply.

709.2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes

requirements 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.

EN 60309-1, Plugs, socket-outlets and couplers for industrial purposes — Part 1: General requirements

(IEC 60309-1)

EN 60309-2, Plugs, socket-outlets and couplers for industrial purposes — Part 2: Dimensional

interchangeability requirements for pin and contact-tube accessories (IEC 60309-2)

EN 60309-4, Plugs, socket-outlets and couplers for industrial purposes — Part 4: Switched socket-outlets

and connectors with or without interlock

EN 61386-24, Conduit systems for cable management — Part 24: Particular requirements — Conduit

systems buried underground (IEC 61386-24)

EN 61558-2-4, Safety of transformers, reactors, power supply units and similar products for supply voltages

up to 1 100 V — Part 2-4: Particular requirements and tests for isolating transformers and power supply units

incorporating isolating transformers (61558-2-4)

HD 60364-4-41:2017, Low-voltage electrical installations — Part 4-41: Protection for safety — Protection

against electric shock
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HD 60364-7-709:2009/A12:2019 (E)

HD 60364-4-43, Low-voltage electrical installations — Part 4-43: Protection for safety — Protection against

overcurrent
709.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
709.3.1
ship

floating craft used for administrative, commercial, industrial, leisure or sport activities (e.g.: boat, yacht, motor

launch, vessel, or houseboat)
709.3.2
harbour

facility for the mooring of ships with fixed wharves, jetties, piers or a pontoon arrangement, capable of

berthing one or more ships

Note 1 to entry: A harbour performs industrial and/or commercial transit and/or storage functions.

709.3.3
marina

facility for the mooring of pleasure crafts with fixed wharves, jetties, piers or a pontoon arrangement, capable

of berthing one or more pleasure crafts

Note 1 to entry: The term “Marina” exists in French but with a different meaning.

709.3.4
pleasure craft
any craft used exclusively for sport or leisure
709.3.5
houseboat

floating decked structure which is designed or adapted for use as a place of permanent residence

709.3.6
accessory
plugs, socket-outlets, ship connectors and ship inlets
[SOURCE: EN IEC 62613-1:2018, 3.1]
Note 1 to entry: The application of accessories is shown in Figure 1.
709.3.6.1
socket-outlet
shore socket-outlet

part intended to be installed with the fixed wiring (shore side) or incorporated in equipment

[SOURCE: EN IEC 62613-1:2018, 3.2 modified: addition of “(shore side)”]

Note 1 to entry: A socket-outlet may also be incorporated in the output circuit of an isolating transformer.

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HD 60364-7-709:2009/A12:2019 (E)
709.3.6.2
plug
shore plug

part intended to be attached directly to one flexible cable, and to be connected to the shore socket-outlet

[SOURCE: EN IEC 62613-1:2018, 3.3 modified: addition of “and do be connected to the shore socket-outlet”]

709.3.6.3
ship coupler

means of enabling the connection at will of a flexible cable to the ship, and which consists of two parts, a

ship connector and ship inlet
[SOURCE: EN IEC 62613-1:2018, 3.4]
709.3.6.3.1
ship connector

part intended to be attached to one flexible cable connected to the supply, and to be connected to the ship

inlet

[SOURCE: EN IEC 62613-1:2018, 3.5 modified: addition of “and to be connected to the ship inlet”]

709.3.6.3.2
ship inlet
part incorporated in, or fixed to, the ship
[SOURCE: EN IEC 62613-1:2018, 3.6]
709.3.7
power pillar, supply pillar
enclosure designed for the electric supply of ships
709.3.8
mobile power unit
mobile enclosure designed for the electric supply of ships
709.3.9
service pillar

enclosure designed to supply ships with electricity, water, telecommunication, etc.

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SIST HD 60364-7-709:2009/A12:2019
HD 60364-7-709:2009/A12:2019 (E)
Key
A Power pillar
B Shore socket-outlet
C Shore plug
D Ship connector
E Ship inlet
F Ship coupler
Figure 1 — Diagram showing the use of the accessories
709.31 Purposes, supplies and structure
709.312 Conductor arrangement and system earthing
709.312.2 Types of system earthing
709.312.2.1 TN-systems
Add the following:

For a TN-system, the final circuits for the supply of ships shall not include a PEN conductor.

709.313 Supplies
Add the following:

709.313.1.2 The nominal supply voltage shall not exceed 250 V single-phase, or 690 V three-

phase.
709.4 Protection for safety
709.41 Protection against electric shock
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SIST HD 60364-7-709:2009/A12:2019
HD 60364-7-709:2009/A12:2019 (E)
709.410.3.5 The protective measures
— obstacles, and
— placing out of reach
as specified in Annex B of HD 60364-4-41:2017 shall not be used.
709.41.C.1 Non-conductive location
Protective measures by non-conducting location shall not be used.
NOTE 1 This precludes the use of class 0 equipment.
709.41.C.2 Protection by earth-free local equipotential bonding
Protective measures by earth-free local equipotential bonding shall not be used.
709.411.2 Requirements for basic protection
709.413 Protective measure by electrical separation
Add the following:

Where electrical separation is used, compliance with all the requirements of Clause 413 and of 709.413.3.2

and 709.413.3.6 shall be provided.
709.413.3.2 Add the following:

The circuit shall be supplied through a fixed isolating transformer complying with EN 61558-2-4.

The protective conductor of the supply to the isolating transformer shall not be connected to the earth

terminal in the socket-outlet supplying the ship.
NOTE 1 See Annex B.
709.413.3.6 Add the following:

The equipotential bonding of the ship shall not be connected to the protective conductor of the shore supply.

709.443 Add the following:

In cases where the risk analysis of the present clause indicates the need for overvoltage protection, SPDs

shall be provided in the pillar.
709.5 Selection and erection of electrical equipment
709.512 Operational conditions and external influences
709.512.2 External influences
Add the following:

Particular attention shall be given to the likelihood of corrosive elements, movement of structures,

mechanical damage, presence of flammable fuel and the increased risk of electric shock due to:

— presence of water;
— reduction in body resistance;
— contact of the body with earth potential.
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SIST HD 60364-7-709:2009/A12:2019
HD 60364-7-709:2009/A12:2019 (E)
709.512.2.1.1 Presence of water (AD)

Equipment installed on or above a jetty, wharf, pier or pontoon shall be selected as follows, according to the

external influences which may be present:
— water splashes (AD4): IPX4;
— water jets (AD5): IPX5;
— water waves (AD6): IPX6.
709.512.2.1.2 Presence of solid foreign bodies (AE)

Equipment installed on or above a jetty, wharf, pier or pontoon shall be selected with a degree of protection

of at least IP4X in order to protect against the ingress of very small objects (AE3).

709.512.2.1.3 Presence of corrosive or polluting substances (AF)

Equipment installed on or above a jetty, wharf, pier or pontoon shall be suitable for use in the presence of

atmospheric corrosive or polluting substances (AF2). If hydrocarbons are present AF3 is applicable.

Equipment installed in presence of sea water shall be adequately protected.
Equipment shall be designed in order to avoid corrosion and pollution of water.
NOTE 1 See European directive n°2455/2001/CE concerning polluting substances.

NOTE 2 Additional recommendations are given in CWA 16387 Clean Harbour Guideline.

709.512.2.1.4 Impact (AG)

Equipment installed on or above a jetty, wharf, pier or pontoon shall be protected against mechanical

damage (impact of medium severity AG2). Protection shall be afforded by one or more of the following:

— the position or location of the equipment shall be selected to avoid being damaged by any reasonably

foreseeable impact;
— local or general mechanical protection shall be provided;

— equipment with a minimum degree of protection for external mechanical impact of IK07 shall be

installed.
709.513 Accessibility
709.513.1 General
Add the following:

Socket-outlets shall be adequately illuminated in order to allow their use at night.

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HD 60364-7-709:2009/A12:2019 (E)
709.521 Types of wiring
Add the following:
709.521.7 Wiring
709.521.7.1 The following wiring methods are suitable for distribution circuits:
a) underground cables;
b) overhead cables or overhead insulated conductors;

c) cables with copper conductors and thermoplastic or elastomeric insulation and installed within an

appropriate product complying with cable management system standard or a cable management system

taking into account external influences such as movement, impact, corrosion and ambient temperature;

d) mineral-insulated cables with PVC protective covering;
e) armoured cables with a thermoplastic or elastomeric covering;

f) other cables and materials that are no less suitable than those listed under a), b), c), d) or e) above.

All precautions shall be taken to prevent cables from being submersed.

Considerations shall be given to the surrounding substances and their potential corrosive effect.

Measures shall be taken to prevent cables from being driven over (e.g. truck, cranes).

709.521.7.2 The following wiring systems shall not be used on or above a jetty, wharf, pier,

pontoon, or over water in the areas with circulation of ships or mooring:

a) overhead cables and overhead conductors in free air suspended from or incorporating a support wire,

e.g. as installation method Nos. 35 and 36 in of HD 60364-5-52 Table A52-3;

b) insulated conductors in conduits, trunking etc., e.g. as installation methods Nos. 4 and 6 in

HD 60364-5-52 Table A52-3;
c) cables with aluminium conductors;
d) mineral-insulated cables.
The use of cables in conduits, trunking systems, etc. is allowed.

In the case where the wharf or floating pontoon needs to be moved, its connections to the pier shall be made

with plugs and socket-outlets according to EN 60309-1.
The degree of protection to the plug shall be at least IP67 when not connected.

709.521.7.3 Cables, products complying with a cable management system standard and cable

management systems shall be selected and installed so that mechanical damage due to tidal and

other movement of floating structures is prevented.

Products complying with a cable management system standard or cable management systems shall be

installed to allow the drainage of water/condensate.
EXAMPLE By sloping and/or drainage holes.
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HD 60364-7-709:2009/A12:2019 (E)
709.521.7.4 Underground cables

Underground distribution circuits shall, unless provided with additional mechanical protection, be buried at a

sufficient depth to avoid being damaged, e.g. by movement of vehicles.

NOTE 1 A depth of 0,5 m is generally considered as a minimum depth to fulfil this requirement.

NOTE 2 For conduit systems buried underground, see EN 61386-24.
709.521.7.5 Overhead cables or overhead insulated conductors
All overhead conductors shall be insulated.

Poles and other supports for overhead wiring shall be located or protected so that they are unlikely to be

damaged by any foreseeable movement of vehicles.

Overhead cables and overhead insulated conductors shall be at a height above ground of not less than 6 m

in all areas subjected to movement of vehicles and 3,5 m in all other areas.

709.531 Devices for protection against indirect contact by automatic disconnection of

supply
709.531.2 Residual current protective devices (RCDs)
Add the following:

Socket-outlets with a rated current up to 63 A shall be individually protected by an RCD having a rated

residual operating current not exceeding 30 mA. The RCD selected shall disconnect all poles, including the

neutral.

Socket-outlets with a rated current above 63 A shall be individually protected by an RCD having a rated

residual operating current not exceeding 300 mA. The RCD selected shall disconnect all poles, including the

neutral.

Account shall be taken of the need for selectivity, e.g. by the use of Type S at the origin of an installation with

RCDs in series.
709.533 Devices for protection against overcurrent
Add the following:

Socket-outlets shall be individually protected by an overcurrent protective device, in accordance with the

requirements of HD 60364-4-43.
709.534 Add the following:

In the case where protective devices are required by 60364-4-443. Type 1 SPDs shall be installed at the

supply source, and Type 2 SPDs shall be installed in switchboards and pillars. SPDs shall be coordinated.

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HD 60364-7-709:2009/A12:2019 (E)
709.536 Isolation and switching
Add the following:
709.536.2 Isolation
709.536.2.1 General

709.536.2.1.1 At least one means of isolation shall be installed in each distribution board. This

means shall disconnect all poles, including the neutral.
709.55 Other equipment
Add the following:
709.55.1 Socket-outlets
709.55.1.1 General
In marinas:

— socket-outlets with a rated current up to 63 A shall comply with EN 60309-2 and EN 60309-4;

— socket-outlets with a rated current exceeding 63 A shall comply with EN 60309-1 and EN 60309-4;

— dual-voltage socket-outlets 230 V/400 V shall comply with EN 60309-1 and EN 60309-4;

— socket-outlets and connectors shall be shuttered or interlocked to prevent live contacts from being

accessible.

In other harbours and similar locations, or where interchangeability is not required:

— socket-outlets shall comply with EN 60309-1 and EN 60309-4 or EN 60309-2 and EN 60309-4.

In both marinas, other harbours and similar locations:

— Socket-outlets complying with a domestic national standard and not exceeding 16 A may be used.

— Socket-outlets shall have a degree of protection of at least IP44 or such protection shall be provided by

an enclosure.

Where the codes AD5 or AD6 are applicable the degree of protection shall be at least IPX5 or IPX6

respectively.

709.55.1.2 Socket-outlets shall be located as close as practicable to the berth to be supplied.

Socket-outlets shall be installed in the distribution board or in separate enclosures.

Socket-outlets shall be installed for the sole purpose to supply ships. For other usages, e.g. exhibition or

markets, dedicated general purpose socket-outlets shall be installed.

709.55.1.3 No more than four socket-outlets shall be grouped together in any one switchboard,

pillar, or any other enclosure.

NOTE 1 See Annex C regarding recommended notices to be placed in facilities adjacent to each group of socket-

outlets.
709.55.1.4 One socket-outlet shall supply one ship only.

Only one socket-outlet shall be connected to the secondary winding of an isolating transformer if any.

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...

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