Where can I find previous editions online?

Question

I&rsquo;m sure that there used to downloadable PDFs of older editions of BS7671 on the IET website. Can anyone direct me to them please. I want to check the original 17th. 
 Thanks in advance.

gkenyon · Accepted Answer

17th Edition BS 7671:2008 
 521.5.2 Ferromagnetic enclosures: electromagnetic effects Single-core cables armoured with steel wire or steel tape shall not be used for an a.c. circuit. The conductors of an a.c. circuit installed in a ferromagnetic enclosure shall be arranged so that all line conductors and the neutral conductor, if any, and the appropriate protective conductor are contained in the same enclosure. 
 Where such conductors enter a ferrous enclosure, they shall be arranged such that the conductors are only collectively surrounded by ferrous material. 
 16th Edition 1991 (including BS 7671:1992) to 16th Edition BS 7671:2001+A2:2004 
 521-02 Cables for a.c. circuits - electromagnetic effects 521-02-01 Single-core cables armoured with steel wire or tape shall not be used for a.c. circuits. Conductors of a.c. circuits installed in ferromagnetic enclosures shall be arranged so that the conductors of all phases and the neutral conductor (if any) and the appropriate protective conductor of each circuit are contained in the same enclosure. Where such conductors enter a ferrous enclosure they shall be arranged so that the conductors are not individually surrounded by a ferrous material, or other provision shall be made to prevent eddy (induced) currents. 
 15th Edition 1981 
 Cables for a.c. circuits - electromagnetic effects 521-8 Single-core cables armoured with steel wire or tape shall not be used for a.c. Conductors of a.c. circuits installed in ferrous enclosures shall be arranged so that the conductors of all phases and the neutral conductor (if any) are contained in the same enclosure. Where such conductors enter ferrous enclosures they shall be arranged so that the conductors are not separated by a ferrous material or provisions shall be made to prevent circulating eddy currents. 
 14th Edition (similar "topic" to cyan highlight) 
 B.100 Cables of a.c. circuits installed in steel conduit shall always be so bunched that the cables of all phases and the neutral conductor (if any) are contained in the same conduit. 
 So, it looks like "eddy currents" for cables entering enclosures came in with 15th Edition, but "all conductors of AC circuits being enclosed together when enclosed by ferrous metal" was a concept existing in 14th Edition (or perhaps earlier ... I haven't looked back any further). Hopefully this is what you're looking for, and that my highlights for 15th, 16th and 17th Editions are helpful?

Where can I find previous editions online?

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