Does a CPC require mechanical Protection

[dodge26]

We have been asked to carry out some linking up eart bars on 5 blocks of flats, they want the CPC running in metal conduit, where I think that a CPC can be clipped direct, anyone know the answer and possible reg number.

 

[johnboy6083]

anything less than 4mm needs mechanical protection as per 544.2.2 (new green regs)

 

[oxocube]

If the client wants it in conduit then thats what you do, he who pays the piper etc.

 

[Engineer54]

If the job's specification calls for earth cables to be run in metallic conduit, then that is exactly what you provide the client. It doesn't matter a jot, what you think, or how you want to install these earth cables, the job's Specification is what you work too!! It's the same on all projects, where the Specification can and often does over rule Regulations, provided is of a higher order!!

 

[Simlec]

I would say they what it in conduit so as to stop it getting nicked!!

 

[johnboy6083]

to be honest, i dont like clipping cables anyway. It has its place, but that place is not anywhere near where people can pull it off the wall.

 

[Knobhead]

Right I’m going to pi$$ on everyone’s parade.

If the CPC is run through steel conduit you have circulating currents and reactance to take in to account. A single conductor through a magnetic conductive trunk is a NoNo! Plastic, aluminium or stainless steel protection is OK, but not plain conduit!

 

[telectrix]

but, tony, surely the only time a current will flow is during a fault condition, for a short duration till the ocpd operates.

 

[Knobhead]

I’m not quoting regulations but “pure physics”.

Remember what you were taught about induced circulating currents?

 

[Simlec]

Right I’m going to pi$$ on everyone’s parade.

If the CPC is run through steel conduit you have circulating currents and reactance to take in to account. A single conductor through a magnetic conductive trunk is a NoNo! Plastic, aluminium or stainless steel protection is OK, but not plain conduit!

Are you referring to Mr. Eddie currents ?