Lighting Circuit r1+r2 values.

[CDB]

Hi,

I was doing my r1+r2 tests on a lighting circuit yesterday in a 6 bed house over 3 floors. Approximately 20 points not including switches. Mainly pendants but some light bars etc and almost all LED or low energy halogen type bulbs. Closed circuit r1+r2 values range from 0.88 on ground floor to 3.06 on top floor.

The lights all work ok. I believe I have found one pendant with a discontinuous earth not picked up on a recent EICR done by a 3rd party, which I will return to this week and fix.

However, a couple of pendants were giving me values of over 130 ohms when the switch was open (light off), which I check as part of the polarity test.

Can someone help me understand why these high r1+r2 values might be occurring?

Thanks

Chris

 

[westward10]

Hi Ian,

Dodgy switches was my first thought. They are old.

To determine your second suggestion I guess I would need to do a full IR which is pretty difficult given the installation.

Switches first!

Thanks for the ideas.

Why is it difficult to do a full IR you can ignore the L/N test.