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Discuss Looking for electrician to swap MCB in OL10 area. in the Electrical Work Up For Grabs |Electrical Jobs area at ElectriciansForums.net

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JakubKot

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Hi.
Im looking for electrician to swap mcb in my consumer unit for one suitable for single phase welder with max input current of 16A. In my consumer unit there is 32A type B mcb that was used with electric shower that is disconnected. I need it swapped for 16A type C (been told its a right one). Welder will use interlocked 16A socket on wall of garage that is part of house. I'm planning to use 4mm cable about 7m long. I need electrician to provide and swap suitable mcb. Consumer unit manufactured by Live Electrical.
Job in Heywood OL10.
 
if your 4mm cable is installed clipped direct. not in insulation, the 32A MCB can stay.
 
the MCB is there to protect the cable from overload. 4mm cable is rated at 32A ( ref. method applied). using the equation Ib<In<Iz, ...16A<32A<32A, (the<symbol being equal to or less, can't do the proper symbol on pc.)
 
A 16A socked should be protected by a device not exceeding 20A. This can be applied where the circuit incorporates more than one socket, for a single point a 16A device makes sense not 32A.
that's debatable. the MCB is to protect the cable, not the socket. OK. BS1363 sockets are protected (downstream) by plug fuses, wheras toe 16A socket is not, but I'm sure a 32A MCB would trip before an overload is sufficient to destroy the socket. is there a reg. to dispute this?
 
that's debatable. the MCB is to protect the cable, not the socket. OK. BS1363 sockets are protected (downstream) by plug fuses, wheras toe 16A socket is not, but I'm sure a 32A MCB would trip before an overload is sufficient to destroy the socket. is there a reg. to dispute this?

I'm sure you could argue that the regs allow it, but I'd say common sense needs to play a part in this. Why wouldn't you want to protect a 16A socket with a 16A ocpd?
 
I'm sure you could argue that the regs allow it, but I'd say common sense needs to play a part in this. Why wouldn't you want to protect a 16A socket with a 16A ocpd?
ideasl situation is a 16A or 20A MCB. my point was that OP could leave the 32A in, esp. if there were other outlets on the circuit. in this case it seems that it will be a dedicated circuit so, yes reduce the In to suit.
[automerge]1569852032[/automerge]
a bit off topic, but according to Wylex in an article in PE, they say that a AFDD negates the need for a RCD. I can't see how.

 

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