briars

I have been challenged by an installer who has installed a 32A TPN fused switch and then ran 6 individual single phase spur units (each rated at 16amp) from the isolator fuse carriers ie used the fused switch as a sub-distribution board in a temporary 3 day exhibition type environment. I can't find anything in the regulations (BS7671:2008) which specifically states this is not recommended but I do feel this is very bad practice, what is other electricians view or is there something specific I can refer to in the Regulations

Shakey

well the fuse is the overcurrent protective device and also effectively the current limiting device, so its no diffenrence to unlimited sockets off a fused spur, except that they are all coming from the same point instead of a radial

I cant think of anything that specifially prohibits this

danzor

exhibition work is so poor. I was told the regs aren't so strict on them, but don't quote me on that. Never looked it up

electro

briars
Reg 314.4 says where an installation comprises more than one final circuit, each final circuit shall be connected to a separate way in the distribution board, this will the same for your situation.

Regards

Shakey

i see what you are saying, but are they seperate final circuits? Why would it be any different to say, a lighting circuit, where you could go from light to light, or equally two or three 'radials' from the same point? Or a ring main, where it is quite accpetable to take a spur dirctly from the breaker rather than a socket or JB?

electro

but the wiring should be electrically seperated the isolator is been used as dis board not a JB because of the use of the overcurrent device.