17th Ed Part P Question

[ccrowe]

A customer wants to add a spured socket to an existing ring final. The CU has MCBs with no RCD protection and no spare ways. There's no way they'll go for a CU change just for one socket and I very much doubt that adding a socket with built-in RCD is good enough to conform to Regs.

How would you get around this?

 

[ban-all-sheds]

I very much doubt that adding a socket with built-in RCD is good enough to conform to Regs.

Why?

It's only your addition that has to comply, so an RCD socket would.

And don't forget 522.6.6 - it may be that putting an RCD FCU directly onto the existing circuit and then running to the new socket is the best idea.

 

[ccrowe]

I understand the rules to be that any circuit I work on has to be compliant with the regs, not just any extension I do to an existing circuit. If I've got this wrong then I'll be a very happy bunny indeed.

 

[ban-all-sheds]

 

[bongos]

Could you replace the MCB with an RCBO? Or is the board too old?

 

[Spark123]

I very much doubt that adding a socket with built-in RCD is good enough to conform to Regs.

Why?

It's only your addition that has to comply, so an RCD socket would.

How do you ensure the additional cable, assuming it is unprotected and concealed less than 50mm is also RCD protected?

 

[ban-all-sheds]

How do you ensure the additional cable, assuming it is unprotected and concealed less than 50mm is also RCD protected?

And don't forget 522.6.6 - it may be that putting an RCD FCU directly onto the existing circuit and then running to the new socket is the best idea.