400V between L&N

[guest119]

Lost neutral.
Seen it before, 380v at a 13a skt.
What is suposed to be the neutral is returning through the other phases, like an unearthed star point.

Boydy

 

[telectrix]

forgot to mention the calibration procedure for sledgehammers.

1. hit a plumber over the head with the hammer under test.

2. accurately measure, with a stopwatch, how long it takes from the impact with the hammer to the impact with the ground.

3. anything under 5 seconds, the hammer passed calibration.

4. if the installation is TT, however, you need to hit him twice. TW*T, TW*T.

 

[Darkwood]

http://www.electriciansforums.net/e...egulations/69309-suppliers-neutral-break.html

here's the link to another thread that gives a better understanding of floating neutrals... Sintra's posted diagrams explain it very well.

 

[bigbaddave]

Thanks Darkwood. I would like to discus further with you but your private message seems to be full.

I am sure you can access his box for a fee

 

[Darkwood]

I am sure you can access his box for a fee

Hey i dont swing that way .... thank you very much

 

[shagbite]

if you did, the o.p. would end up with dark wood. (sorry!)

 

[Ago4Ago]

Bingo! Dismantled half a staircase to gain access to Dis-Board feeding Consumer unit in question & sure enough a burnt out neutral. Not originally tightened enough by the looks of it.

 

[Darkwood]

Glad you found it .... bill as extra emergency repair keep any evidence or take pictures, be cautious of the damage the heat has caused if like where it was clamped if major discoloration has occured it best to replace the busbar or terminal bar when you get the chance as the heat will have altered the metal and it can become a weak point and re-occur.

 

[Nivag316]

Check to see if the neutral has gone high resistance.

 

[Nivag316]

Sorry only got half way cown the post before posting the previous

 

[C&H]

I got 400v at a 16a single phase socket one time doing a periodic. Couldn't believe my eyes, switched meter on/off a few times and the RCD, still got 400v. Socket was wired on the yellow phase, turned out flood light on the red phase had melted phase to cpc. Incoming earth had been disconnected from the HV transformer hence 400v live to earth lol. The mind boggles sometimes.