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Andrew Smith
Andrew Smith, Electrical Technician
Category: Electrical
Satisfied Customers: 3586
Experience:  Central Heating Engineer, Part P registered electrical engineer
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I replaced a light and this works fine but lights in 3v

Customer Question

I replaced a light and this works fine but lights in 3v other rooms have stopped working
Submitted: 1 year ago.
Category: Electrical
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Mike G. replied 1 year ago.

Hi, I'm Mike G and I'll be glad to assist you. I send you the request for a phone call.

Expert:  Mike G. replied 1 year ago.

You might want to check the white wire connection in the box where you changed the light fixture.

Customer: replied 1 year ago.
there is no white wire
Expert:  Mike G. replied 1 year ago.

Sorry, didn't see you were in the UK. Check the neutral connection.

Customer: replied 1 year ago.
Sorry what is the NEU
Customer: replied 1 year ago.
Is this the connection at the point of where I changed the light or in the fuse box
Expert:  Mike G. replied 1 year ago.

Where you changed the light. If all was working before changing the fixture.

Customer: replied 1 year ago.
I have checked it and removed and put it back t make sure it is secure
Customer: replied 1 year ago.
The problem is this makes no difference. There is only one Neu wire I the circuit
Expert:  Mike G. replied 1 year ago.

To have voltage on the neutral, it means the neutral is open. It will be ahead of that box.

Customer: replied 1 year ago.
might that mean checking the junction box. How do I check if the neu is open
Expert:  Mike G. replied 1 year ago.

Visual inspection and pull on the individual wires at connections.

Customer: replied 1 year ago.
How long are you there for
Expert:  Mike G. replied 1 year ago.

Anytime. I'm notified when a reply is made.

Customer: replied 1 year ago.
okay will make the checks and get back ASAP
Expert:  Mike G. replied 1 year ago.

Very good.

Customer: replied 1 year ago.
Have checked the NEU wires - taken them out and reconnected and ensured they are secure but lights are still not coming on. Checked for current with a tester and the tester light comes on whether I touch the live or the NEU wires
Expert:  Mike G. replied 1 year ago.

Using a non contact tester makes troubleshooting harder. You need a 2 wire voltage tester to continue.

Customer: replied 1 year ago.
I have a multi meter
Expert:  Mike G. replied 1 year ago.

Good, needed to know. Go to the panel and test the circuit there.

Customer: replied 1 year ago.
Which panel and what setting do I need to put the multi meter
Expert:  Mike G. replied 1 year ago.

Set the meter to 300VAC and the panel that the circuit originates in.

Customer: replied 1 year ago.
my maximum is 250 VAC
Expert:  Mike G. replied 1 year ago.

That will do.

Customer: replied 1 year ago.
Get a reading of 48
Expert:  Mike G. replied 1 year ago.

On the hot, neutral or both. Are you testing to earth?

Customer: replied 1 year ago.
Testing on both but not on earth
Expert:  Mike G. replied 1 year ago.

Test to earth

Customer: replied 1 year ago.
With NUE and earth I am getting 201
Expert:  Mike G. replied 1 year ago.

What is it from hot to earth

Customer: replied 1 year ago.
Hot to earth is 238
Expert:  Mike G. replied 1 year ago.

The reading have me at a loss. I'm going to opt out and see if any of the other experts have a new thought on it. Stand by for the next expert.

Customer: replied 1 year ago.
Okay Mike thanks - did you expect to see a certain level of reading
Expert:  Mike G. replied 1 year ago.

I suspect that by those readings every circuit originating at that panel wouldn't work, due to a bad neutral connection on or ahead of the service equipment. Having only one not working is what stumps me at this point.

Customer: replied 1 year ago.
There are 3 rooms in which the lights are not working. The new fitting I put up is working fine
Customer: replied 1 year ago.
No other fittings in the house were touched and in fact with the new fitting I only had to connect a live and NEU wire and not touch any other wire in the ceiling connector
Customer: replied 1 year ago.
It is getting late will link tomorrow after 19:00
Customer: replied 1 year ago.
Is anyone taking up the case
Expert:  Andrew Smith replied 1 year ago.

It sounds like you have wired the light fitting incorrectly and not wired the live to the next light into the live into the light.

How many different cable were there - LN&E in, LN&E out, Switch wire in/out

Customer: replied 1 year ago.
There is one NEU, 3 live and 2 earth. To check if the new fitting was causing the problem I have also taken the new fitting off completely and the lights in the other three rooms have not worked. I then refitted the new fitting it again has worked fine. I have also changed the live and NUE around in the new fitting and the new fitting has worked fine but the other lights have not worked
Customer: replied 1 year ago.
I have switched wires in and out on the new fitting and it has worked fine. I have done the same on the ceiling rose with the other lights but they have not come on
Expert:  Andrew Smith replied 1 year ago.

ok,

try this - turn you other lights on, take one live at a time and touch to another until you get them coming on.

These two will need to go into the sme connection but not the same as the brown to the new lamp

Customer: replied 1 year ago.
are these the live wires where I connected the new light
Customer: replied 1 year ago.
Also thought the issue was with the NUE
Expert:  Andrew Smith replied 1 year ago.

Yes in the new light, take them out - but wait until it is light before you attempt this.

You will need that neutral for the neutral connection on the lamp itself

Earths in the earth block too

Customer: replied 1 year ago.
OKAY WILL TRY IT WHEN IT IS STILL LIGHT - SO WONT ATTEMPT TONIGHT IN WHICH CASE WILL NEED TO WAIT UNTIL THE WEEKEND
Customer: replied 1 year ago.
THANKS FOR THE SUGGESTION - BY DOING THIS DOES IT MEAN THE PROBLEM MIGHT BE WITH THE LIVE CIRCUIT
Expert:  Andrew Smith replied 1 year ago.

Yes, the live has to feed this light and then carry onto the next

Customer: replied 1 year ago.
WILL CHECK AT THE WEEKEND
Customer: replied 1 year ago.
I have done as asked with the live feed and nothing happened to the three lights they are still not working. With the lights not working I am still noticing when I touch the NEU wire with a tester the tester light comes on. I also noticed that the wires in the on/off switches are all live regardless of whether the switch is on or off.
Customer: replied 1 year ago.
Is anyone able to respond
Expert:  Andrew Smith replied 1 year ago.

This is the way it should be wired.

If you have a tester then we know which is the live loop in - even if it is a black wire.

Separate them all then turn the power back on and see how many are live, if it is just the one then try the black against each of the reds and see if the lights in the other rooms come on.

Customer: replied 1 year ago.
Okay will do
Expert:  Andrew Smith replied 1 year ago.

Again, try when it is light and come back to me.

Customer: replied 1 year ago.
Problem could not be sorted by doing the above so called out an electrician. Found the problem in another working light where the NUE had come loose from connecter. All lights working now
Expert:  Andrew Smith replied 1 year ago.

Ok, well done for sorting it but something that is nearly impossible via this means

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