New CU

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MarcoM

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Hello,

As part of a partial rewire I am having the consumer unit changed.

The proposal so far is for "Installation of 12 MK 18th edition consumer unit with individual RCBO per circuit".

I take it this is a decent quality box?

Thanks
 
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That will be ok

Make sure they carry out a full test of existing circuits and rectify any faults before the change. This is because there maybe existing faults that could effect RCBO operation. And better to find any such faults sooner rather than later.

If your spark says he will test after the change, get a new spark, because that is a crooks way of doing a change.

Edit - It should not be necessary to explain to an electrician why the testing should be done before changing a cu.
 
Last edited:
out of interest. do you just know the signs of a borrowed neutral then RF ?
and move both onto the same RCBO/RCD ?
or how do you cope with it RF?
 
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How does anyone deal with it if found before the CU change?

Whatever your answer, which way is better?
 
It should not be necessary to explain to an electrician why the testing should be done before changing a cu.
 
When do you mean by before? Immediately prior, the day before, an?

What do you do? Please explain.

Do you take someone's installation to pieces, discover a so-called reason not to change the CU, put it back together, and leave without charging?


Would a new CU not be better for all the other circuits - and the customer, of course?
 
EFLImpudence said:
When do you mean by before? Immediately prior, the day before, an?

What do you do? Please explain.

Do you take someone's installation to pieces, discover a so-called reason not to change the CU, put it back together, and leave without charging?


Would a new CU not be better for all the other circuits - and the customer, of course?
Click to expand...

Read post Nos 2 and 9, nothing else to say
 
For myself would not bother testing, if there is a fault it needs fixing and with all RBCO easy enough to temp drop in a MCB while locating the fault. But for a customer you want paying, and to tell the customer after complete all is done, but you have a fault on these circuits which needs curing before I can turn circuit on is not going to go down well.

OK with my house where the fuse box is in the ceiling I would expect the electrician to fit new consumer unit then look for faults, it is going to be hard enough working in that space as it is.

However what is considered as testing? If the main isolator is off and all fuses/mcb's on and total is less than one meg to earth then there should not be a problem, it has been tested and it will set.

If some one in the past has split the lights and caused a borrowed neutral if you find it then circuits should be de-energised until fault removed regardless of if new consumer unit fitted or not. So why test for that fault before changing?
 
ericmark said:
If some one in the past has split the lights and caused a borrowed neutral if you find it then circuits should be de-energised until fault removed regardless of if new consumer unit fitted or not.
Click to expand...
Why not just put them on the same MCB? Safer than leaving the shared neutral connection outside the DB and also better than leaving it disconnected.
 
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