Thoughts on a supply

[Spoon242]

I have been asked to look at a consumer unit which is sometimes reading 310V on a meter as read by a plumber who was working on the boiler.

I am going to measure with something better than a multimeter to see what readings are there, but I believe sometimes it does read correctly at 230V.

Thoughts please,

 

[Spoon242]

A floating neutral? Every possibility with those kinds of voltages. Especially if the voltage shifts at specific times of day.

Surprising things haven’t started to go bang yet!

Spoon is this a rural or residential area?

Its a residential area

 

[IQ Electrical]

Cant open it IQ, could you backward save it please. Im at work and only have word 2003

Ok, try this:

 

[telectrix]

well first i wouldn't believe a plumber if he said "it'll be dark before morning". tea time usually results in a drop in supply voltage if anything, due to the increased load.

 

[philipb]

Hi there,
I had a similar thing last year,lamps blowing ect,tested volts at a socket and got a
300 plus reading,found nuetrol cable burning on dead side of isolator insibe the cu.

 

[Knobhead]

I’ve posted this before, it shows the effect of current on voltage with a floating neutral

Balanced

View attachment 7665

Unbalanced.

View attachment 7666

 

[Spoon242]

I have been to the customers house tonight and got back a short while ago. I did find that the neutral was loose at the incoming side before the meter, not overly loose, but a good 4 to 5 turns on the screw driver.
I went through all the split board and checked for anything that could have been loose. Seems good, just the incoming terminals loose.
She then went on to show me the socket that always trips in her utility room and the shower that always trips. Guess what they did not perform this time haha!

Her spilt board has on the rcd side, two ring circuits, down stairs lights, hmm, and the shower at 45A.

Lights normally not in rcd side right?
Shower correct?

 

[Deleted member 26818]

What was the voltage?

 

[Spoon242]

What was the voltage?

I only read a good steady 232v the whole time I was there.