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tomodo

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Hi guys working in a factory having to spur off a ring main problem is its already got a fuse spur coming off it for some fans. The ring main is on a 32A breaker and wired in 4mm guessing this might be for volt drop. Question is can i spur off this socket twice using 4mm cable? Then the cabel is protected and safe still. so i can get wires in terminals was thinking to relocate fused spur for fans into new added socket. so it will go RING MAIN spured to new socket then out of there to fused spur. All wired in 4mm. cheers
 
I've not got the book in front of me but I thought that was where there is a full page illustration of the standard ring final circuit with spurs etc clearly illustrated.

Yes it shows you a typical arrangement, no design spec. The standard circuits in the onsite guide have prerequsites set out, if these are not met then you need to design the circuit and show compliance.

Cheers
 
i wouldn't just guess its 4mm based on vd.

we were laughing at the way overspeced supplies on some jobs.

they were told your not allowed to use anything smaller than 4mm XD

it was for little smoke damper boxes controlling an individual smoke damper.

another personal favorite was a 70mm supply to a panel that only had 50a isolator
 
Also that little diagram is based on the ring being wired in 2.5.
In this case as initially explained the ring is wired in 4mm with a proposed 4mm spur

Without further information we have to assume a worst case scenario that 4mm has been used due to de-rating factors making the ccc of 2.5mm too low for a ring. So without further information we cannot assume that the 4mm when de-rated has only got the ccc of the 2.5 in the standard circuit.
 

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