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Topic Title: Standby generators
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Created On: 15 March 2006 08:06 PM
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 15 March 2006 08:06 PM
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00458807370

Posts: 8
Joined: 13 May 2003

C certificate regulations question,
I have come accross this question on an old C cert paper, can any body help with the answer.

A generator set is to be used as a temporary standby supply for a work shop whilst essential work is conducted on the sub station transformer.
1, describe the requirements of BS7671 with regard to,

the means of earthing the standby gen in relation to the public supply

the precautions to be taken regarding isolation of the public supply

a suitable means for automatic disconnection of the standby supply.

I have worked on my answers, but would appreciate anybody elses opinion on this.
cheers sn
 22 March 2006 11:11 PM
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mapj1

Posts: 9366
Joined: 22 July 2004

Well, in reality I'd make sure N-E bond at the generator and spike it, and have all-poles (LNE) isolation from the suppliers cables, either by 4 pole two position switch (break B4 make), or suitably chunly plug and socket.. The sizze of the workshop is not given which is a shame, as it affect which is the more appropriate, if we are talking 32A single phase or 600A 3 phase!
regsards M.
Ps reading you again, what you want is what the regs say - well, protection against foire and shock, needs to be as good with generator or mains, and the two shall never be both connected. sorry - dozy.

-------------------------
regards Mike
 28 August 2016 03:05 PM
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weirdbeard

Posts: 3116
Joined: 26 September 2011

Bump!

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:beer)
 28 August 2016 08:02 PM
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mapj1

Posts: 9366
Joined: 22 July 2004

good lord we are resurrecting the dead. I still stand by my answer though. Though what I meant of course was a 'chunky switch'.
Maybe an RCD or an earth break relay nowadays.

-------------------------
regards Mike
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