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I've been on this job to do an inspection before fitting a new RCD OR RCBO board. In most of my career until now the CPC is inside the T+E cable. This property has a separate CPC all through out the building. Only where there has been modifications, modern wiring has been used. If I can prove the ZS is good, is it ok to connect to this system. It's seems to be mainly the lighting that is wired in single sheathed cable which has been ran in conduit. I am hoping if anyone has any information regarding the regs about separate bare earth running through the property. There is a risk of borrowed neutrals if changing to an rcd or rcbo board. The customer does not want a Rewire but wants spots fitted and sockets moving. I have convinced him to change the board, now I am worried about nuisance tripping. However if you could advice about the earth mainly would be a great help. Personally I feel the wiring was good for it's day.

[ElectriciansForums.net] I'm not sure if the Regs allowed separately bare earths.
 
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I have seen a few lengths of copper clad aluminium, I have some 7/.029 here somewhere. I have only once seen a house wired with solid aluminium cables, horrible stuff just breaks off when disturbed.
 
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freddo said:
I have seen a few lengths of copper clad aluminium, I have some 7/.029 here somewhere. I have only once seen a house wired with solid aluminium cables, horrible stuff just breaks off when disturbed.
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I suspect the 7/.029 is actually 4.0mm as I am pretty sure although not certain it was never produced under imperial sizes.
 
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davesparks said:
Why do you say that?
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The bonding isn’t exactly satisfactory And when doing ELI certain meters can pump up to 26A down the earth that would hurt like hell and might have some bad consequences... I’d be wanting to do a full range of dead tests first before doing a Zs
 
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MFS Electrical said:
The bonding isn’t exactly satisfactory And when doing ELI certain meters can pump up to 260milliamps down the earth that would hurt like hell and might have some bad consequences... I’d be wanting to do a full range of dead tests first before doing a Zs
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0.26A? A normal Zs test should be more than that!
This is why we carry out dead tests before live tests and the regulations specify this order.

Anti-trip tests regularly give incorrect readings and are not a good replacement for a standard efli test,
 
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davesparks said:
0.26A? A normal Zs test should be more than that!
This is why we carry out dead tests before live tests and the regulations specify this order.

Anti-trip tests regularly give incorrect readings and are not a good replacement for a standard efli test,
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I did at first say 26 amps but i edited it and I don’t know why I changed it to be honest
 
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MFS Electrical said:
I’d disconnect the bonding and the bare earths from the board and do an R2 on the bare earth from the end at the board to ensure its complete and then again at the bit your going to connect into and to the board itself and then the pipes themselves just to rule out that the bare earth was coming from elsewhere I reckon if you do that you’ve pretty much proved beyond reasonable doubt that the earth is suitable and actually coming from the CU and not the pipes or anywhere else.
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I did hint at doing the dead tests first several times throughout the thread as well
 
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