240v between neutral and earth??

[Gixxerdan]

Just recently bought a house and been looking at the electrics making sure it is all right. The property has a conservatory on the back and a light which doesnt work. When I measured between live and neutral I got 0v so went back to the switch. Here i also got 0v. Went to measure between earth and neutral and got 240v! Any ideas? Could it be a neutral fault which has shorted or broke somewhere? The switch works but it switches the neutral and earth on and off! No breaker trips or anything though.

Thanks

 

[MKS]

Polarity issues

 

[i=p/u]

if light doesnt work , broken neutral maybe.

polarity maybe. start from the start

 

[Octopus]

In your earlier threads you have said you are training to become an electrician - and in which case can you expand on what tests you've done and where? The more information you give, the less we are guessing, and the more you get back.

 

[sedgy34]

As mks says polarity problem or what you think is neutral is actually a live

 

[Des 56]

The switch works but it switches the neutral and earth on and off! ​

Best if you expand on this statement or re phrase your findings​

 

[vernam616]

Switched live not been identified maybes?, thinks its a neutral because its black/blue

 

[londonlec]

The black wire is not a neutral

 

[vernam616]

You have tried changing the lamp in the light havnt you?

 

[JD Hogg]

Are you sure there is just the one light? Maybe a light outside controlled from the same switch? Try changing the bulb and see what happens.

 

[Octopus]

The black wire is not a neutral

What makes you say this?

 

[telectrix]

if the polarity is correct, then it means a break in the neutral between the no-working fitting and the CU. some older installations may have fused neutrals. need more info, and a coulpe of pics would help.

 

[Knobhead]

My money is on he's testing an un marked switch wire.
My last guess until we get more info.

 

[telectrix]

well if it goes in the switch, it probably is a switched L. don't you just love these posts with so little info to go on.