This corrigendum contains corrections to BS 7671:2008. For clarification, where appropriate, deleted text has been ruled through and additional text has been underlined. Sufficient of the existing text has been included to enable urs to identify the nature and extent of the change.
Amend Table 41.1, NOTE 2 and 411.4.5, NOTE by deleting “(typically 2I Δn )”. Amend 434.2.1 as follows:
434.2.1 The regulations in Regulation 434.2 shall not be applied to installations situated in locations prenting a fire risk or risk of explosion and or where the requirements for special installations and locations specify different conditions.
Amend 515.3.1 and 515.3.2 by replacing references to “BS EN 50082” and “BS EN 50081” with “BS EN 61000 ries”. Amend 533.3 as follows:
533.3
Selection of devices for protection of wiring systems against fault current
The application of the regulations of Chapter 43 for fault currents of duration up to 5 s shall take into account maximum fault current conditions. Where the device provides protection against fault current o
nly, account shall be taken of minimum short-circuit fault current conditions.
Where the standard covering a protective device specifies both a rated rvice short-circuit breaking capacity and a rated ultimate short-circuit breaking capacity, it is acceptable to lect the protective device on the basis of the ultimate fault current short-circuit breaking capacity for the maximum short-circuit fault current conditions. Operational circumstances may, however, make it desirable to lect the protective device on the rvice short-circuit breaking capacity, e.g. where a protective device is placed at the origin of the installation.
Where the short-circuit breaking capacity of the protective device is lower than the maximum prospective short-circuit or earth fault current that is expected at its point of installation, it is necessary to comply with the requirements of the last paragraph of Regulation 536.1 and Regulation 536.5.
Amend Table 53.2 as follows:
Device Standard Isolation (5)
Emergencysuperman什么意思
Switching (2)
Functional switching
chine simplified(5) In an installation forming part of a TT or IT system, isolation requires disconnection of all the live conductors.
See Regulation 537.2.2.1.
Replace 537.1.2 as follows:
537.1.2 Combined protective and neutral (PEN) conductors shall not be isolated or switched except as permitted by Regulation 543.3.4.
Except as required by Regulation 537.1.4, in a TN-S or TN-C-S system the neutral conductor need not be isolated or switched where it can be regarded as being reliably connected to Earth by a suitably low impedance. For supplies which are provided in accordance with the Electricity Safety, Quality and Continuity Regulations 2002, the supply neutral conductor (PEN or N) is considered to be connected to Earth by a suitably low impedance.
Corrigendum
(July 2008)
8810BRITISH STANDARD
BS 7671:2008 Requirements for Electrical Installations IEE Wiring Regulations, Seventeenth Edition
© The Institution of Engineering and Technology and BSI
2014考研英语
NO FURTHER ELECTRONIC COPYING WITHOUT WRITTEN PERMISSION
Amend 702.411 as follows:
702.411415Protective measure: Automatic disconnection of supply Additional protection Amend Regulation number 702.411.3.3 to 702.415.2
Note the changing of the above two Regulation numbers effectively moves that group from page 171 to 172. Amend 702.55.1(ii) and (iii) by replacing “702.411.3.3” with “702.415.2”.
Amend 705.1, NOTE by deleting “and BS EN 6100-1”
Amend Figure 705, bottom left-hand corner, by replacing “150 mm 150 mm” with “150 mm x 150 m
m” Appendix 1, British Standards to which reference is made in the Regulations
Amend as follows:
BS 6220:1983 (1999) Electric cables. Single core PVC insulated flexible cables of rated voltage
600/1000 V for switchgear and controlgear wiring
Deleted by BS 7671:2008, Corrigendum (July 2008)
Appx 15
BS EN 61000 Electromagnetic compatibility (EMC)
BS EN 61000 is a multiple part standard 515.3.1
515.3.2
Appx 5 AM Appx 11 para 1
BS EN 6100-1 Glossary of building and civil engineering terms
Deleted by BS 7671:2008, Corrigendum (July 2008)
罗曼蒂克英文705.1 note
Appendix 9, Definitions – multiple source, d.c. and other systems
Amend Figures 9D to 9M as follows:
Appendix 15, Ring and radial final circuit arrangements, Regulation 433.1 Amend Figures 1 and 2 as shown over page:
Indexbrisbane
Amend as shown:
Page 364
-
swimming pools-
- supplementary equipotential
bonding 702.411.3.3(ii) 415.2cricket
Page 366
- swimming pools 702.411.3.3 415.2
Page 372
- swimming pools 702.411.3.3 415.2
Page 373
- swimming pools 702.411 415.2
- swimming pools 702.411.3.3 415.2Page 379
kazuo ishiguro
- starting currents 522.1.1 552.1.1
Page 382
- swimming pools 702.411.3.3 415.2
Page 386
- swimming pools 702.411.3.3 415.2
- supplementary equipotential
bonding required 702.411.3.3 415.2
APPENDIX 15 (Informative)
RING AND RADIAL FINAL CIRCUIT ARRANGEMENTS,
REGULATION 433.1
This appendix ts out options for the design of ring and radial final circuits for houhold and similar premis in accordance with Regulation 433.1, using socket-outlets and fud connection units. It does not cover other aspects of the design of a circuit such as: – Protection against electric shock, C
hapter 41
– Protection against thermal effects, Chapter 42四级英语作文范文
– Protection against overcurrent, Chapter 43
– Selection and erection of equipment, Part 5.
1 Fig 15A RING FINAL CIRCUIT ARRANGEMENTS, REGULATION 433.1.5
The load current in any part of the circuit should be unlikely to exceed for long periods the current-carrying capacity of the cable (Regulation 433.1.5 refers). This can generally be achieved by:
(i) locating socket-outlets to provide reasonable sharing of the load around the ring
(ii) not supplying immersion heaters, comprehensive electric space heating or loads of a similar profile from the ring circuit (iii) connecting cookers, ovens and hobs with a rated power exceeding 2 kW on their own dedicated radial circuit
(iv) taking account of the total floor area being rved. (As a rule of thumb Historically, a limit of 100 m2 has been adopted.)
2 Fig 15B RADIAL FINAL CIRCUIT ARRANGEMENTS, REGULATION 433.1
1.5 mm2
peppapig
