FprEN IEC 61439-5:2023
(Main)Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution in public networks
Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution in public networks
IEC 61439-5:2023 is available as IEC 61439-5:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61439-5:2023 defines the specific requirements for public electricity network distribution assemblies (PENDAs). PENDAs have the following criteria: - used for the distribution of electrical energy in three phase systems for which the rated voltage does not exceed 1 000 V AC (see Figure 101 for a typical distribution network) and DC systems not exceeding 1 500 V DC; - stationary; - open type assemblies are not covered by this document; - suitable for installation in places where only skilled persons have access for their use, however, outdoor types can be installed in situations that are accessible to ordinary persons - intended for use in energy distribution in public power grids; - indoor use: assemblies for installation inside of electric power substations; - outdoor use: assemblies containing an enclosure suitable for open air installation. This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) omission of the requirement to conduct mechanical tests at -25 °C when enclosures are made of a metallic material; b) addition of assumed loading factors generation supplies and electric vehicle charging applications; c) additional dielectric tests when a PENDA is used in a distribution substation with separate HV and LV earths; d) further clarification of representative samples for design verification.
Niederspannungs-Schaltgerätekombinationen - Teil 5: Schaltgerätekombinationen in öffentlichen Energieverteilungsnetzen
Ensembles d'appareillage à basse tension - Partie 5: Ensembles pour réseaux de distribution publique
IEC 61439-5:2023 est disponible sous forme de IEC 61439-5:2023 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61439-5:2023 définit les exigences spécifiques aux ensembles pour réseaux de distribution publique d'électricité (ERD). Les ERD remplissent les critères suivants: - ils sont utilisés pour la distribution de l'énergie électrique dans des systèmes triphasés pour lesquels la tension assignée ne dépasse pas 1 000 V en courant alternatif (se reporter à la Figure 101 qui représente un réseau de distribution classique) et des systèmes à courant continu qui ne dépassent pas 1 500 V en courant continu; - ils sont fixes; - les ensembles ouverts ne sont pas couverts par le présent document; - ils sont adaptés à une installation dans des emplacements où seules des personnes qualifiées ont accès pour leur utilisation; cependant, les types pour l'extérieur peuvent être installés dans des endroits accessibles à des personnes ordinaires; - ils sont destinés à être utilisés dans les réseaux de distribution publique; - à l'intérieur: ensembles installés à l'intérieur de postes d'alimentation électrique; - à l'extérieur: ensembles avec une enveloppe adaptée à une installation en plein air. Cette troisième édition annule et remplace la deuxième édition parue en 2014. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) omission de l'exigence de réalisation d'essais mécaniques à -25 °C lorsque les enveloppes sont en matériau métallique; b) ajout d'application de charge de véhicules électriques et de production d'énergie avec des facteurs de charge présumés; c) ajout d'essais diélectriques lorsqu'un ERD est utilisé dans un poste avec terres HT et BT séparées; d) description plus détaillée des échantillons représentatifs pour la vérification de la conception.
Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 5. del: Sestavi za distribucijo električne energije v javnih omrežjih
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 61439-5:2022
01-september-2022
Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 5. del: Sestavi za
distribucijo električne energije v javnih omrežjih
Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power
distribution in public networks
Niederspannungs-Schaltgerätekombinationen - Teil 5: Schaltgerätekombinationen in
öffentlichen Energieverteilungsnetzen
Ensembles d'appareillage à basse tension - Partie 5: Ensembles pour réseaux de
distribution publique
Ta slovenski standard je istoveten z: prEN IEC 61439-5:2022
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
29.240.99 Druga oprema v zvezi z Other equipment related to
omrežji za prenos in power transmission and
distribucijo električne energije distribution networks
oSIST prEN IEC 61439-5:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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121B/155/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61439-5 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-06-10 2022-09-02
SUPERSEDES DOCUMENTS:
121B/143/CD, 121B/153/CC
IEC SC 121B : LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES
SECRETARIAT: SECRETARY:
Germany Mr Jörg Hußmann
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
SC 17B,TC 18,TC 44,TC 64,SC 121A
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
TITLE:
Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution
in public networks
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it, for
any other purpose without permission in writing from IEC.
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1 CONTENTS
2 FOREWORD . 3
3 1 Scope . 5
4 2 Normative references. 6
5 3 Terms and definitions . 6
6 4 Symbols and abbreviations . 8
7 5 Interface characteristics . 8
8 6 Information . 8
9 7 Service conditions . 9
10 8 Constructional requirements . 9
11 9 Performance requirements . 12
12 10 Design verification . 12
13 11 Routine verification . 26
14 Annexes . 27
15 Annex O (informative) Guidance on temperature rise verification . 28
16 Annex AA (normative) Cross-section of conductors . 29
17 Annex BB (informative) Items subject to agreement between the ASSEMBLY
18 manufacturer and the user . 31
19 Annex CC (informative) Design verification . 35
20 Annex DD (informative) List of notes concerning certain countries . 36
21 Bibliography . 37
22
23 Figure 101 – Typical distribution network . 6
24 Figure 102 – Diagram of test to verify resistance to shock load of a PENDA-O . 15
25 Figure 103 – Diagram of test to verify impact force withstand of a PENDA-O . 16
26 Figure 104 – Diagram of test to verify the resistance to static load . 17
27 Figure 105 – Sandbag for test to verify the resistance to shock load . 18
28 Figure 106 – Diagram of test to verify resistance to torsional stress of a PENDA-O . 19
29 Figure 107 – Diagram of test to verify the mechanical strength of doors . 22
30 Figure 108 – Striker element for test of resistance to mechanical shock impacts
31 induced by sharp-edged objects . 23
32 Figure 109 – Typical test arrangement for mechanical strength of base . 24
33
34 Table 101 – Values of assumed loading . 8
35 Table 102 – Axial load to be applied to the inserts . 23
36 Table AA.1 – Minimum and maximum cross-section of copper and aluminium
37 conductors, suitable for connection (see 8.8) . 29
38 Table AA.2 – Standard cross-sections of round copper conductors and approximate
2
39 relationship between mm and AWG/kcmil sizes (see 8.8 of IEC 61439-1:2020) . 30
40 Table BB.1 – Items subject to agreement between the ASSEMBLY manufacturer and the
41 user 31
42 Table CC.1 – List of design verifications to be performed . 35
43
44
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45 INTERNATIONAL ELECTROTECHNICAL COMMISSION
46 ____________
47
48 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
49
50 Part 5: Assemblies for power distribution in public networks
51
52 FOREWORD
53 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
54 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
55 international co-operation on all questions concerning standardization in the electrical and electronic fields. To
56 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
57 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
58 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
59 in the subject dealt with may participate in this preparatory work. International, governmental and non -
60 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
61 with the International Organization for Standardization (ISO) in accordance with conditions determined by
62 agreement between the two organizations.
63 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
64 consensus of opinion on the relevant subjects since each technical committee has representation from all
65 interested IEC National Committees.
66 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
67 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
68 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
69 misinterpretation by any end user.
70 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
71 transparently to the maximum extent possible in their national and regional publications. Any divergence
72 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
73 the latter.
74 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
75 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
76 services carried out by independent certification bodies.
77 6) All users should ensure that they have the latest edition of this publication.
78 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
79 members of its technical committees and IEC National Committees for any personal injury, property damage or
80 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
81 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
82 Publications.
83 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
84 indispensable for the correct application of this publication.
85 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
86 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
87 International Standard IEC 61439-5 has been prepared by subcommittee SC121B: Low-
88 voltage switchgear and controlgear assemblies, of IEC technical committee 121: Switchgear
89 and controlgear.
90 This third edition cancels and replaces the second edition published in 2014. It constitutes a
91 technical revision.
92 This edition includes the following significant technical changes with respect to the latest
93 edition:
94 The text of this document is based on the following documents:
CDV Report on voting
95
96 Full information on the voting for the approval of this standard can be found in the report on
97 voting indicated in the above table.
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98 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
99 This document is to be read in conjunction with IEC 61439-1. The provisions of the general
100 rules dealt with in IEC 61439-1 are only applicable to this document insofar as they are
101 specifically cited. When this document states “addition”, “modification” or “replacement”, the
102 relevant text in IEC 61439-1:2020 is to be adapted accordingly. Subclauses that are
103 numbered with a 101 (102, 103 etc.) suffix are additional to the same subclause in IEC 61439-
104 1:2020.
105 Tables and figures in this Part 5 that are new are numbered starting with 101.
106 New annexes in this Part 5 are lettered AA, BB, etc.
107 The reader’s attention is drawn to the fact that Annex DD lists all of the “in-some-country”
108 clauses on differing practices of a less permanent nature relating to the subject of this
109 document.
110 A list of all parts of the IEC 61439 series, under the general title Low-voltage switchgear and
111 controlgear assemblies can be found on the IEC website.
112 The committee has decided that the contents of this publication will remain unchanged until
113 the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
114 related to the specific publication. At this date, the publication will be
115 • reconfirmed,
116 • withdrawn,
117 • replaced by a revised edition, or
118 • amended.
119
120
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121 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
122
123 Part 5: Assemblies for power distribution in public networks
124
125
126
127 1 Scope
128 This part of IEC 61439 defines the specific requirements for public electricity network
129 distribution assemblies (PENDAs).
130 PENDAs have the following criteria:
131 – used for the distribution of electrical energy in three phase systems for which the rated
132 voltage does not exceed 1 000 V AC (see Figure 101 for a typical distribution network)
133 and DC systems not exceeding 1500 V DC;
134 – stationary;
135 – open type assemblies are not covered by this document;
136 – suitable for installation in places where only skilled persons have access for their use,
137 however, outdoor types may be installed in situations that are accessible to ordinary
138 persons;
139 – intended for use in energy distribution in public power grids
140 - indoor use: assemblies for installation inside of electric power substations
141 - outdoor use: assemblies containing an enclosure suitable for open air installation
142 The object of this document is to state the definitions and to specify the service conditions,
143 construction requirements, technical characteristics and tests for PENDAs. Network
144 parameters may require tests at higher performance levels.
145 PENDAs may also include control and or signalling devices associated with the distribution of
146 electrical energy.
147 NOTE Control and monitoring devices can be used in smart grid applications or the transmission of smart grid data.
148 This document applies to all PENDAs whether they are designed, manufactured on a one-off
149 basis or fully standardised and manufactured in quantity.
150 The manufacture and/or assembly may be carried out other than by the original manufacturer
151 (see 3.10.1 of IEC 61439-1:2020).
152 This document does not apply to individual devices and self-contained components, such as
153 motor starters, fuse switches, electronic equipment, etc. which comply with the relevant
154 product standards.
155 If the substation is owned or operated by a public distribution system operator (DSO),
156 PENDA’s which are used as LV distribution panels in transformer substations are within the
157 scope of this standard,
158 This document does not apply to specific types of assemblies covered by other parts of
159 IEC 61439 series.
160
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PENDA-I or PENDA-O
PENDA-O
Customers
MV/LV substation
Connecting points
IEC
161
162 Figure 101 – Typical distribution network
163 NOTE 1 If a PENDA is equipped with additional equipment (for example meters), in such a way that the main
164 function is changed considerably, then other standards can also apply as agreed between user and manufacturer
165 (see 8.5 of IEC 61439-1:2020).
166 NOTE 2 Where local regulations and practices permit, a PENDA according to this standard can be used in other
167 than public networks.
168 NOTE 3 DSO’s may define additional requirements for their PENDA’s
169 2 Normative references
170 This clause of IEC 61439-1:2020 applies except as follows.
171 Addition:
172 IEC 60695-11-10:2013, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
173 vertical flame test methods
174 IEC 61439-1:2020, Low-voltage switchgear and controlgear assemblies – Part 1: General
175 rules
176 ISO 9223:2012, Corrosion of metals and alloys — Corrosivity of atmospheres —
177 Classification, determination and estimation
178 ISO 6506-1:2014:2014, Metallic materials – Brinell hardness test – Part 1: Test method
179 3 Terms and definitions
180 This clause of IEC 61439-1:2020 applies except as follows.
181 3.1 General terms
182 Additional terms:
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183 3.1.101
184 public electricity network distribution assembly
185 PENDA
186 Assembly, generally for installation in a public electricity network which in use, receives
187 electrical energy from one or more supplies and distributes that energy through one or more
188 cables to other equipment
189 Note 1 to entry: A PENDA is installed, operated and maintained solely by skilled persons.
190 Note 2 to entry: Some types of a PENDA were previously known as a cable distribution cabinet (CDC).
191 3.1.101.1
192 outdoor public electricity network distribution assembly
193 PENDA-O
194 cubicle type public electricity network distribution assembly that is suitable for outdoor
195 installation in places that may, or may not, be accessible to the public
196 3.1.101.2
197 indoor public electricity network distribution assembly
198 PENDA-I
199 public electricity network distribution assembly suitable for installation indoors, generally
200 without an enclosure, but including all structural parts necessary to support busbars,
201 functional units and other ancillary devices, necessary to complete the assembly.
202 3.1.102
203 Design life
204 Minimum duration for which specified performance characteristics of equipment are expected
205 when the equipment is operated as intended and regularly maintained by instructed persons
206 in accordance with the manufacturer’s instructions.
207 [SOURCE: IEC 60050-: 2014, 395-07-93, modified - Note to entry omitted and 'granted'
208 replaced by 'expected when . instructions.']
209
210 3.3 External design of assemblies
211 3.3.1
212 open-type assembly
213 This term of IEC 61439-1:2020 does not apply.
214 3.9 Verification
215 Modifications:
216 3.9.1
217 design verification
218 Delete the note.
219 3.9.1.2
220 verification comparison
221 This term of IEC 61439-1:2020 does not apply.
222 3.9.1.3
223 verification assessment
224 This term of IEC 61439-1:2020 does not apply.
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225 4 Symbols and abbreviations
226 This clause of IEC 61439-1:2020 applies.
227 5 Interface characteristics
228 This clause of IEC 61439-1:2020 applies except as follows.
229 5.4 Rated diversity factor (RDF)
230 Addition:
231 In the absence of an agreement between the assembly manufacturer and user concerning the
232 actual load currents, the assumed loading of the outgoing circuits of the assembly or group of
233 outgoing circuits may be based on the values given in Table 101.
234 For distribution and final circuits, it is assumed load current is the rated current of the
235 protective device, In, as required by the user, multiplied with the loading factor of Table 101.
236 Table 101 – Values of assumed loading
Application Assumed
Loading
factor
Regular distribution grid connections 0.9
2-3 circuits
Regular distribution grid connections 0.8
4-5 circuits
Regular distribution grid connections 0.7
6-9 circuits
Regular distribution grid connections 0.6
≥ 10 circuits
Generation supply (e,g. PV, wind farm, biomass) 1.0
Charging infrastructure for EV 1.0
237
238 6 Information
239 This clause of IEC 61439-1:2020 applies except as follows.
240 6.1 Assembly designation marking
241 Addition to first paragraph:
242 Designation plates may be placed inside an enclosure of an assembly provided their intended
243 place ensures good legibility and visibility when the door(s) is open or the cover is removed.
244 Replacement of item d):
245 d) IEC 61439-5.
246 6.3 Device and/or component identification
247 Additional paragraph:
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248 In the case of removable fuse-carriers which are specific to a fuseway, a label shall be placed
249 on the fuse carrier as well as on the fuse base, to avoid incorrect interchangeability of the
250 fuse-carrier.
251 Additional subclause:
252 6.101 Circuit identification
253 It shall be possible to identify each functional unit in a clearly visible manner.
254 7 Service conditions
255 This clause of IEC 61439-1:2020 applies except as follows.
256 7.1 Normal service conditions
257 7.1.1 Climatic conditions
258 Addition to the first paragraph:
259 Unless the user specifies a PENDA shall be suitable for use in an arctic climate, the lower
260 limit of ambient air temperature is –25 °C as specified in Table 15 of IEC 61439-1:2020. For
261 an arctic climate the lower limit of ambient temperature is –50 °C.
262 7.2 Special service conditions
263 Addition of the following note to item h):
264 Additional paragraph:
265 Additional requirements for a PENDA-O, to be installed where heavy snowfalls occur and
266 where they are adjacent to areas where there is snow clearance by ploughing, are subject to
267 agreement between manufacturer and user.
268 8 Constructional requirements
269 This clause of IEC 61439-1:2020 applies except as follows.
270 8.1 Strength of materials and parts
271 8.1.1 General
272 Addition:
273 A PENDA-O shall be arranged for ground mounting, transformer mounting, pole mounting,
274 surface wall mounting or mounting within a recess within a wall, as agreed between user and
275 manufacturer.
276 A PENDA may be direct coupled to a transformer by means of a flange coupling or it may
277 connect to its supply by means of cable or via busbars as agreed between user and
278 manufacturer. Outgoing circuits shall be suitable for connection by means of cables.
279 A reliable locking device shall be provided on outdoor enclosures which prevents access by
280 unauthorized persons. The fixings of any covers etc. which are removable for installation or
281 maintenance operations shall only be accessible while the door(s) are open
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282 Doors, lids and covers shall be so designed that, after they are locked, they do not open due
283 to subsequent moderate ground settlement, nor due to exposure to vibration arising from
284 traffic and/or ground excavation and reinstatement works.
285 Any auxiliary equipment, e.g. meters, relays, instruments, circuit breaker trip units,
286 communications equipment, that can be readily replaced, are excluded from the minimum
287 design life of a PENDA.
288 Note Typically the design live of a PENA is 30 years, assuming it is operated as intended and regularly maintained
289 by instructed personnel in accordance with the manufacturer’s instructions.
290 8.1.3.2 Resistance of insulating materials to heat and fire
291 Additional subclause:
292 8.1.3.2.101 Verification of category of flammability
293 The insulating materials used for enclosures, barriers and other insulating parts shall have
294 flame retardant properties in accordance with 10.2.3.101 of this document.
295 8.1.5 Mechanical strength
296 Additional subclause:
297 8.1.5.101 Verification of mechanical strength
298 The mechanical properties of a PENDA-O shall comply with 10.2.101 of this standard.
299 Parts of the PENDA-O intended to be embedded in the ground shall withstand the stresses
300 imposed on them during installation and normal service and comply with 10.2.101.9.
301 Additional subclause:
302 8.2 Degree of protection provided by an assembly enclosure
303 8.2.1 Protection against mechanical impact
304 Subclause 8.2.1 of IEC 61439-1:2020 does not apply.
305 The mechanical impact tests required by this document are at least equal to IK10 in
306 accordance with IEC 62262 (see 8.1.5.101).
307 8.2.2 Protection against contact with live parts, ingress of solid foreign bodies and
308 water
309 Addition:
310 Open type assemblies (IP00) are not covered by this document.
311 When a PENDA-O is intended to be installed in places accessible to the public, its enclosure
312 shall, when fully-installed in accordance with the manufacturer’s instructions, provide a
313 degree of protection of at least IP34D according to IEC 60529. In other locations, the
314 minimum level of protection shall be at least IP33.
315 PENDA-O’s that are intended to be installed in places accessible to the public shall, unless
316 otherwise stated by the user, be designed such that when any temporary cables are
317 connected, the enclosure shall provide a degree of protection of at least IP23C according to
318 IEC 60529. See 8.8 of this document.
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319 8.4 Protection against electric shock
320 NOTE: When agreed between the user and manufacturer, methods of carrying out specific tasks with the PENDA
321 energised shall be established. These are to take into account local health and safety practises and legislation.
322 8.4.2.1 General
323 The third paragraph does not apply.
324 Additional subclause:
325 8.4.2.101 Earthing and short-circuiting means
326 When specified by the user, the outgoing units in an assembly shall be so constructed that
327 they can be earthed and short-circuited in a secure manner by means of a device(s)
328 recommended by the manufacturer, which ensures the required degree of protection (IP
329 code) is maintained for all parts of the assembly. This requirement is not applicable if it could
330 cause a safety hazard arising from the system conditions and/or operational practice.
331 8.4.3.1 Installation conditions
332 Additional paragraph:
333 When a user specifies the assembly is to feed overhead cable lines, outgoing units shall be
334 designed in such a way that an attached cable(s) can be earthed at the termination(s).
335 8.8 Terminals for external conductors
336 Replacement of the first three paragraphs with the following:
337 In the absence of a special agreement between user and manufacturer, terminals shall be
338 capable of accommodating cables having copper or aluminium conductors from the smallest
339 to the largest cross-sectional area corresponding to the appropriate rated current (see
340 Table AA.1).
341 The terminations for outgoing circuits shall be located so that adequate spacing is provided
342 and to facilitate terminating the phase conductors of a cable irrespective of their lay.
343 When specified by the user the phase cable terminals of each outgoing circuit shall be
344 separated from all other hazardous live parts. When the terminals of an outgoing circuit are
345 exposed protection shall be provided against accidental contact with other hazardous live
346 parts. Separation and protection shall be from the normal direction of access and in
347 accordance with IPXXB of IEC 60529.
348 Where specified by the user, the incoming circuit shall be suitable for connection by means of
349 either bare or insulated bars.
350 Additional subclauses:
351 8.101 Marking as an obstacle to snow clearance
352 When specified by the user, a PENDA-O that is intended for use in regions where heavy
353 snowfalls occur in accordance with 7.2, shall be marked as an obstacle to snow clearance.
354 Holders shall be provided, attached to the PENDA-O, to accommodate marking rods and it
355 shall be possible to install and make adjustments to the position of the marking rod from
356 outside the PENDA-O.
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357 8.102 Ease of operation and maintenance
358 All parts of the assembly shall, as far as practicable, be readily accessible and replaceable
359 without excessive dismantling. The conditions for interchangeability of parts of the assembly
360 may be subject to an agreement between the user and the manufacturer.
361 The design shall be such that the cables can be readily connected from the front.
362 When a PENDA does not have a means of measurement incorporated, it shall be possible, by
363 the use of a portable instrument, to readily and safely measure voltages in all phases of
364 incoming units and on both sid
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