Lighting Circuit Problem

[chloebear]

Hi All,

Just returned from trying to locate an issue with an upstairs lighting circuit -

with the circuit L/N/E disconnected from the board and breaker I get he following readings:-

(a) Type 2 Insulation Resistance Test = 49.7 taken at 250V
(b) Voltage reading on the (dead) circuit of 3.5V

when checking at one of the lighting outlets with the circuit connected & energised, but with the light switch turned off I get a voltage reading of 23.2V????

any ideas????????????

 

[jackhammerJIM]

chloebear what is the problem ?

49.7 million ohms

3.5 volts likely an induced voltage .


what are you testing between to get the 23 volts ?

 

[chloebear]

testing between L/N to get the 23V on a switched off circuit in a Class 2 housing

 

[jackhammerJIM]

its an induced voltage , nothing to worry about

 

[Specialist]

As Jackhammer said: It's induced ac pickup from parallel energised circuits & should'nt create any problems.
What was the original problem you were trying to find ?.

 

[MDJ]

downstairs light switch on and upstairs circuit blowing the RCD more than likely lol

 

[Octopus]

Hi All,

Just returned from trying to locate an issue with an upstairs lighting circuit -

with the circuit L/N/E disconnected from the board and breaker I get he following readings:-

(a) Type 2 Insulation Resistance Test = 49.7 taken at 250V
(b) Voltage reading on the (dead) circuit of 3.5V

when checking at one of the lighting outlets with the circuit connected & energised, but with the light switch turned off I get a voltage reading of 23.2V????

any ideas????????????

Whats the problem reported by the client?

 

[chloebear]

Client wanted their earthing checking out as they have ben experiencing 'some strange'!!!! effects - Earthing tests out Ok - incoming PME & Bonding, but stumbled across this in the process.

 

[MDJ]

Client wanted their earthing checking out as they have ben experiencing 'some strange'!!!! effects - Earthing tests out Ok - incoming PME & Bonding, but stumbled across this in the process.

how bizarre

 

[jackhammerJIM]

what strange effects ?

 

[R G]

Did you isolate the incoming supply to the whole dis board , and test each circuit in turn , not just isolate the lights only , give us some more info on the way you have tested the circuits,,,,

 

[alanl]

Was the 'strange effects' some CFL flashing occasionally?
Induced voltage. Some people still dont think it occurs. I had LED lamps in my kitchen, even when turned off there was a low glow from one of them.
I've been called out at least 3 times to look at flashing CFLs. I told them over the phone what it was, 2 of them still didnt beleive me.