Consumer unit change and RCD ramp testing

[pencilpusher]

I have three questions re changing a CCU: I have seen the "CCU change and you" thread but I don't believe it mentions anything about inspection dates.

1) I believe I need to put "Consumer Unit change only" on the periodic label but what date do I put for the next inspection. I am working towards 2391 but have done a periodic of sorts before changing the CU. However, I am not qualified to do periodics yet.

2) I have installed 2 Hager RCD's and 1 hager RCBO. The RCBO trips at 19mA and the RCD's at 21mA. I was expecting something between 25-29 mA. Are these trips currents normal for a 30mA RCD/RCBO.

3) On the schedule of inspections I can tick most boxes but not the "cables in safe zones" becuase I cannot be sure. I presume LIM goes in there?

Thanks PP

 

[topquark]

I have three questions re changing a CCU: I have seen the "CCU change and you" thread but I don't believe it mentions anything about inspection dates.

1) I believe I need to put "Consumer Unit change only" on the periodic label but what date do I put for the next inspection. I am working towards 2391 but have done a periodic of sorts before changing the CU. However, I am not qualified to do periodics yet.

If it's domestic, max 10 years or on change of owner, change of usage ... unless condidition or usage of the instalation dictates otherwise.

2) I have installed 2 Hager RCD's and 1 hager RCBO. The RCBO trips at 19mA and the RCD's at 21mA. I was expecting something between 25-29 mA. Are these trips currents normal for a 30mA RCD/RCBO.

A little on the low side, take them back to the wholesaler for exchange.

3) On the schedule of inspections I can tick most boxes but not the "cables in safe zones" becuase I cannot be sure. I presume LIM goes in there?

That should be N/A on the EIC.
LIM on a EICR/PIR, just make sure that it's also agreed with the owner.

Thanks PP

Inserts in blue.

 

[pencilpusher]

Thank you topquark. My point is that I don't have 2391 so am not doing periodics as such but with the tests I have done for this CU change, I have done these tests anyway to ensure all is OK. If I put 10 years then I am saying I have done a periodic when I shouldn't do really. The tests done help me to know that this installation is safe before CU change. Am I making sense here?

Thanks PP

 

[topquark]

Thank you topquark. My point is that I don't have 2391 so am not doing periodics as such but with the tests I have done for this CU change, I have done these tests anyway to ensure all is OK. If I put 10 years then I am saying I have done a periodic when I shouldn't do really. The tests done help me to know that this installation is safe before CU change. Am I making sense here?

Thanks PP

Ten years would be the default for a new installation (or complete rewire), hence being the max you would state. Only you can determine, based on your testing results, what's appropriate for the next inspection. You will have to guage that by how old the existing instalation is, it's condition and the usage (I assume it's domestic). It's not really a question anyone (who hasn't seen the instllation) can answer for you.

 

[Deleted member 26818]

Thank you topquark. My point is that I don't have 2391 so am not doing periodics as such but with the tests I have done for this CU change, I have done these tests anyway to ensure all is OK. If I put 10 years then I am saying I have done a periodic when I shouldn't do really. The tests done help me to know that this installation is safe before CU change. Am I making sense here?

Thanks PP

No reason why you can't conduct a PIR, or state when you consider the next inspection should be.
There is no requirement for an Inspector to have a qualification.

 

[telectrix]

your RCD trip times may be lower than expected if you are testing with loads /circuits connected. this is because there may be a small amount of leakage on the installation.

 

[IQ Electrical]

I have three questions re changing a CCU: I have seen the "CCU change and you" thread but I don't believe it mentions anything about inspection dates.

1) I believe I need to put "Consumer Unit change only" on the periodic label but what date do I put for the next inspection. I am working towards 2391 but have done a periodic of sorts before changing the CU. However, I am not qualified to do periodics yet.

2) I have installed 2 Hager RCD's and 1 hager RCBO. The RCBO trips at 19mA and the RCD's at 21mA. I was expecting something between 25-29 mA. Are these trips currents normal for a 30mA RCD/RCBO.

3) On the schedule of inspections I can tick most boxes but not the "cables in safe zones" becuase I cannot be sure. I presume LIM goes in there?

Thanks PP

You will need to issue an Electrical Installation Certificate for the consumer unit change regardless of whether you carried out a PIR or not.

On the schedule of inspections, you should enter N/A for items such as 'safe zones' as the schedule will only relate to the work that you have carried out.

 

[pencilpusher]

No reason why you can't conduct a PIR, or state when you consider the next inspection should be.
There is no requirement for an Inspector to have a qualification.

I did not know that. Thanks. I just wanted to get it right. Regards PP

 

[pencilpusher]

You will need to issue an Electrical Installation Certificate for the consumer unit change regardless of whether you carried out a PIR or not.

On the schedule of inspections, you should enter N/A for items such as 'safe zones' as the schedule will only relate to the work that you have carried out.

Yep OK. There will be a lot of N/A's I suspect for a CCU change then?

 

[topquark]

Sorry, yes that should be N/A on the EIC for the CU change!

 

[telectrix]

i have a rubber stamp with N/A on it. LOL.

 

[pencilpusher]

i have a rubber stamp with N/A on it. LOL.

:shades_smile: