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Discuss 240v between neutral and earth?? in the Electrical Forum area at ElectriciansForums.net

G

Gixxerdan

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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
 
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i=p/u

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Arms
if light doesnt work , broken neutral maybe.

polarity maybe. start from the start
 
O

Octopus

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  • #4
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.
 
S

sedgy34

  • Thread Starter Thread Starter
  • #5
As mks says polarity problem or what you think is neutral is actually a live
 

Des 56

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Arms
Esteemed
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
 
V

vernam616

  • Thread Starter Thread Starter
  • #7
Switched live not been identified maybes?, thinks its a neutral because its black/blue
 
L

londonlec

  • Thread Starter Thread Starter
  • #8
The black wire is not a neutral
 
V

vernam616

  • Thread Starter Thread Starter
  • #9
You have tried changing the lamp in the light havnt you?
 
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.
 

telectrix

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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.
 
K

Knobhead

  • Thread Starter Thread Starter
  • #13
My money is on he's testing an un marked switch wire.
My last guess until we get more info.
 

telectrix

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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.
 
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