Discuss No RCD on entire installation in the Commercial Electrical Advice area at ElectriciansForums.net

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Hi all,

I have done a small job of installing a radial circuit and adding a spur to a ring final circuit.
I am not too sure about the existing installation. It is in a commercial premises office type with a single phase CU. I have an issue with the fact that there is not an RCD to be found. I think there should be one but I have done mainly domestic. Would it be possible to install a stand alone 30ma RCD before the CU or does it need a new CU. Please correct me if I am wrong.
Cheers
 
Hi all,

I have done a small job of installing a radial circuit and adding a spur to a ring final circuit.
I am not too sure about the existing installation. It is in a commercial premises office type with a single phase CU. I have an issue with the fact that there is not an RCD to be found. I think there should be one but I have done mainly domestic. Would it be possible to install a stand alone 30ma RCD before the CU or does it need a new CU. Please correct me if I am wrong.
Cheers
Does your new work require one cables buried in walls installing a socket for example?
 
Does your new work require one cables buried in walls installing a socket for example?

Yes, probably 1/3 of both ring final circuits is buried in the wall with plastic capping as I can see it coming out of the wall above the suspended ceiling. The rest is run round the perimeter of the office in plastic dado trunking with sockets.
 
Needed to undertake a risk assessment before works were carried as this requires a Minor Works.
 
Yes, probably 1/3 of both ring final circuits is buried in the wall with plastic capping as I can see it coming out of the wall above the suspended ceiling. The rest is run round the perimeter of the office in plastic dado trunking with sockets.
If your cables you've installed are not in the wall then you might not need rcd protection for the cables anyway
 
Thought it was from an existing circuit.

The spur was from an existing circuit but I also reinstated an existing radial the had been disconnected by a previous spark. The reason it was disconnected was that they had floor sockets removed and the 2 MCB's labelled floor sockets were disconnected and removed. One of these had already been changed to a radial and was disconnected by mistake.
 
This radial is directly below the CU. The ring final circuit I added a spur to has cables buried in the wall.
Only the work you install needs to comply so if existing cables are in walls but the ones you install are not then you don't need an rcd for cables in the wall anyway.
If you want to improve the installation it's up to you and the paying client
 
Regs give 2 exceptions for not providing rcd protection to sockets up to 20amps and one is for providing one item of equipment suitably labelled for its purpose if you wanted to go down that route
 
Regs give 2 exceptions for not providing rcd protection to sockets up to 20amps and one is for providing one item of equipment suitably labelled for its purpose if you wanted to go down that route

So I could simply label the 2 double sockets for the servers and inform the client. Could I also label the spur as this is connected to an existing circuit.
 

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