Problem with a timer fan on light circuit

[Octopus]

Whats that?

Each reply to this thread has own unique number .......... just to the left of the + quote button .............. so you've just posted #60

 

[Midwest]

L-Nwas 1.4 Mohm. Its a dorma bungalow with aflat roof. Only access to the wiring is all the ceilings down as its got eyeball spots and no idea where the Jbs are.

You don't get much sleep Tilecutter. Bet you wished you hadn't taken on the job?

 

[davesparks]

Well this morning I turned up with my meters and did an insulation test on the upstairs lighting circuit L N -E was 1.2Mohm which is just scraping through. Volts must be inducing through the cables insulation. Took the timer fan back and fitted a pullcord model and an Rcbo. Advised the customer its a rewire. Thanks guys for the input.

Just scraping through?
Volts inducing through the insulation?
Advised a rewire?

Well that's a load of bovine excrement isn't it!
They don't need a rewire, they need an electrician.

 

[Tilecutter]

You've ruled out the fan as being the problem as far as I can see, so now you need to track down where the this 9V is coming from.

What have you measured the 9V with reference to, earth or neutral?
if you have a suitable multimeter then try measuring it with that, I suspect it will give a higher voltage reading.

I think the simplest explanation for a voltage on the S/L when it shouldn't be is that the switch is not operating correctly, so I'd be inclined to test that first.

The 9 v was in every room upstairs when the switches were off.

 

[Tilecutter]

Just scraping through?
Volts inducing through the insulation?
Advised a rewire?

Well that's a load of bovine excrement isn't it!
They don't need a rewire, they need an electrician.

Whats the answer then Einstein?

 

[buzzlightyear]

The 9 v was in every room upstairs when the switches were off.

and the best academy award and the winner for saying 9volts when the switches are off. goes to !

 

[Midwest]

View attachment 37809 and the best academy award and the winner for saying 9volts when the switches are off. goes to !

I try not to post late at night (for me), but keeping it all to yourself is just selfish.

 

[buzzlightyear]

looks like the mice in the house have stolen 221 volts from the upstairs lighting!
or their must have been a 9volts battery.
if thats the case I would have informed the person of the property .

 

[Des 56]

Just read this thread,what a palava over a fan
The conclusion is a rewire is recommended because the fan is playing silly games ?

I have never tried that one

 

[davesparks]

Whats the answer then Einstein?

Well it's certainly not that 'volts must be inducing through the insulation' As a result of a low insulation resistance.

No need to be Einstein to understand induction, it's taught in secondary schools after all!

I don't know the answer as I haven't visited the property and tested anything, but I'm pretty sure it wouldn't take very long to find the cause with a logical process and testing.