How do I do this?

Goody · Sep 10, 2011

Hi folks,

There was a garage in the garden and it had a supply through a 2.5 mm (buried in the ground) connected to a RCD on the main DB. The garage is now converted into an “Out-house” and I have installed a mini DB with only MCB’s on that existing 2.5 mm cable that supplies a 13 amps socket and two lamps.

I need to do a “Major Work Certificate” for the installation on the new build; how do I complete the “EIC”?

I find Ze at the main DB and the R1+R2 of the distribution circuit to the point of the mini DB. Should I then test the circuits in the new build and record on the same sheet? If so, how it’s done?

Kind regards

telectrix · Sep 10, 2011

do 2 EICs. 1 for the distribution circuit and a 2nd 1 for the outbuilding. your Ze in the outbuilding would be recorded as Zdb.

Silly Sausage · Sep 10, 2011

I'm getting a horrible feeling this 2.5mm is a length of T&E.

When I moved into mine a long while back, garage was fed, perfectly satisfactorily, by a bit of a flex clipped to the garden wall.
It only failed when I had a bonfire.

GLENNSPARK · Sep 11, 2011

Could you not replace the feed with an armoured run off a breaker (without RCD) and RCD it at the garage board......better discrimination that way...........

malcolmsanford · Sep 11, 2011

In reality you will only issue the certificates for the work you have carried out. So that will be for installing the new garage type board. As you have changed the protection characteristics of the circuits in the out house then you need to test them and ensure that they are sound and fit for continuing use and these circuits are the one that go onto the SoI and SoTR.

As for the 2.5mm distribution cable you really do not need to certificate anything on that. You have not installed it and by the sounds of things you have not changed any of it's characteristics. Of course you should have made sure that the cable was sound for continued use as in reg 131.8, as I'm sure you have also dealt with the earthing and bonding issue under this reg.

You could add the tests of that circuit to the SoTR, I would, and then note on the EIC under existing installation that you have utilized an existing distribution circuit and results for this is on the attached SoTR, but in reality you don't need to do any of this.

Goody · Sep 11, 2011

malcolmsanford said:
In reality you will only issue the certificates for the work you have carried out. So that will be for installing the new garage type board. As you have changed the protection characteristics of the circuits in the out house then you need to test them and ensure that they are sound and fit for continuing use and these circuits are the one that go onto the SoI and SoTR.

As for the 2.5mm distribution cable you really do not need to certificate anything on that. You have not installed it and by the sounds of things you have not changed any of it's characteristics. Of course you should have made sure that the cable was sound for continued use as in reg 131.8, as I'm sure you have also dealt with the earthing and bonding issue under this reg.

You could add the tests of that circuit to the SoTR, I would, and then note on the EIC under existing installation that you have utilized an existing distribution circuit and results for this is on the attached SoTR, but in reality you don't need to do any of this.

Great advice; thanks!