New C U Certification

[Tucosweep]

Hi,
Need the help of the pro's please.

I'm unsure to what I need to fill out on the test schedules for a new consumer change,
Do I input all test results of existing circuits which are not new?

I will be greatfull for any advice please

 

[malcolmsanford]

You put the tests that are relevant to your work that was carried out, there is no nothing in the regulations that tells you that when you change a CU you must test the entire installation

 

[trev]

Yeah, nothing in the regs to say you test everything, but I would just in case

 

[Tucosweep]

So I should just test all existing circuits and enter the results on the schedule? But just state that it was a CU change in the description of works,
Will it make me responsible for the existing circuits?

 

[micknew]

But you should have tested the installation before carrying out the works.

 

[trev]

If you test it you should record the results

 

[micknew]

So a CU change does not require a full installation test before or after the works?

 

[malcolmsanford]

But you should have tested the installation before carrying out the works.

And what would you say those tests should be

 

[tonycoysh]

As I understand it (I will probably be corrected - happy to be if so)

The extent installation covered by this certificate would be: Consumer Unit change only and tick the 'alteration box'

I personally then test every circuit so I can prove that by me changing the consumer unit has not effected the electrical safety of the rest of the installation.

 

[micknew]

Tests to verify the integrity of the installation so that the client can be advised of the works required to satisfy regs. following the cu change.

 

[Tucosweep]

Thanks Tonycoysh

 

[malcolmsanford]

What have you changed by replacing the new Cu ................have you installed extra circuits, so there is no additions apart from the CU itself

You have altered the protection device characteristics yes, so you need to ensure that the existing circuit will now activate the new protection devices .................. so Zs will be 1667.

You will do a global IR and as long as it is over 2 Mohm that is all you need to do.

Do you do R1 + R2 no ............I wouldn't unless I felt a need to do it.

I would certainly do all 7 RCD tests, that is a must ............

Would I do continuity of ring circuits ..........doubtful

 

[trev]

Maybe I'm a fusspot but I'd still do the whole range of tests just for my own peace of mind.
Maybe that's why I'm not getting many CU changes

 

[kamkam]

'Would I do continuity of ring circuits ..........doubtful'

so would you just put that ring final circuit on a 32a mcb and assume its ok

 

[Octopus]

"New consumer unit and upgrade (or) installation of bonding to water and gas" is what 90% of my CU installation certificates state.

Don't forget its notificable too.