Consumer unit change testing

[Ghost2011]

hi all I've got my first consumer unit change to do as I'm using this as my first nic assessment. My question is when doing my ir test the whole house is on led downlights about 30 of then plus under kitchen 12v led and a lot of sub sockets, will all,of theses need to be disconnected to do these test. Also do I need to do r1+r2 on every downlight.

Any advice is much appreciated as this is my first nic assessment after this change.

Thanks

 

[andyb]

Just IR test between LN together and earth.
R1+R2 from furthest point.

 

[westward10]

Agreed.

 

[Ghost2011]

So by doing the ln together and earth for each circuit this would mean that I don't need to disconnect all LEDs or sensitive equipment.

 

[Octopus]

Don't take this the wrong way but do you think you think you are ready for the assessment?

 

[Ghost2011]

I can see why you would ask that I just don't want to mess anything up as I haven't done the ir test this way before it just so happens this house has a lot of LEDs and sub sockets in and would take ages to go round and take everything out then put back in. So I would rather check first as this way will save a lot of time.

 

[Taylortwocities]

As above. Tie L & N together and IR test between that and earth.
If you are really unsure, wind your IR tester down to 250VDC for the test. No need to go for 500V if the test results at 250 are OK.

 

[charlie76]

Just IR test between LN together and earth.
R1+R2 from furthest point.

I would measure R1 + R2 at each light fitting. How is he proving continuity of protective conductors by only testing at the final light fitting?

 

[Octopus]

The ideal way to do proper tests is well and truly screwed by all these fittings.

 

[westward10]

As above. Tie L & N together and IR test between that and earth.
If you are really unsure, wind your IR tester down to 250VDC for the test. No need to go for 500V if the test results at 250 are OK.

500v is the required voltage.

 

[mark.]

I may be wrong, (I am new to this). but i thought you could use 250v as long as the results comply with 500v

 

[The Ghost]

Regs say 500v but sometimes I test at 250v where there is equipment sensitive to damage. But really speaking it will be a departure from regs to leave it at that.

 

[LankyWill]

I would measure R1 + R2 at each light fitting. How is he proving continuity of protective conductors by only testing at the final light fitting?

If there was a break in the earth conductor prior to the final light, he wouldn't be able to get the reading as there would be no earth path back to CU.

I rarely bother with R1+R2, usually Zs-Ze although i feel thats a brave statement on this forum

 

[HandySparks]

I would measure R1 + R2 at each light fitting. How is he proving continuity of protective conductors by only testing at the final light fitting?

House with, say, 100+ recessed downlights and you're going to pull each one out of the ceiling. Pull the other one.

 

[bigspark17]

Your testing to ensure the circuits are safe to renergise and surely put cu change only on eic extent. I would suggest end of line zs, L&N - earth IR, continuity of ring end-end conductors
On final circuits would achieve this.