r1+r2 test on 2 way lighting

Octopus · Mar 17, 2014

Are you using Kewtech adapters? They can give off unusual readings.....

Davem · Mar 17, 2014

All fluke pretty new kit too. It certainly is a head scratcher. Will definitely post what I find tomorrow thanks for help and advice guys

GLENNSPARK · Mar 17, 2014

Murdoch said:
Are you using Kewtech adapters? They can give off unusual readings.....

they shouldn`t do...as long as they are kept clean, are interfacing correctly with the fitting and the multi-lam sockets are also clean...

tazz · Mar 17, 2014

If you work this out.....the average 100w lamp is aprox 550 ohms, so unless there are over 10 still on the lighting circuit, the must be no lamps still in with 60 ohms, and a faulty switch or junction box, I would suggest at least a few hundred ohms when carbonised..this level would suggest a lighting or shaver transformer still in the circuit or bathroom fan

R G · Mar 17, 2014

There could be anything on this circuit , If as the Op says he has these readings and he has access to joint boxes , it shouldn't take much sorting with a wandering lead , see how he gets on with it and what he finds

tazz · Mar 17, 2014

Going to correct myself after talking to Glenn.....before someone see my mistake that a load can`t be measured on a R1/R2 test....so my theory, of a transformer or fan is out the window...

R G · Mar 18, 2014

As I said there could be anything on that circuit and we don't fully know how he has been testing it and wether he had fully isolated the circuits at the D/B , just have to see what he comes back with ….

telectrix · Mar 18, 2014

tazz said:
If you work this out.....the average 100w lamp is aprox 550 ohms, so unless there are over 10 still on the lighting circuit, the must be no lamps still in with 60 ohms, and a faulty switch or junction box, I would suggest at least a few hundred ohms when carbonised..this level would suggest a lighting or shaver transformer still in the circuit or bathroom fan

tazz.that 550 is when hot.cold resistance is much less, usually round 50-70.

telectrix · Mar 18, 2014

i'd be getting the wander lead out. first R2 and then R1. with the latter, test on both sides of switch as well. see if there's a significant difference across the switch.