Advice ref blinking lights all circuits

[Lukeowl]

Hi there,


I should start by saying I am not an electrician, but am after some advice as we have a problem that we aren’t getting any answers on.

In January, we had a new fuse board installed to replace an old edition one. This is a recent Wylex model with circuit breakers. The electricians who installed it also added some outdoor lights, a couple of sockets in the kitchen and updated a few sockets around the house for us.

Approx 10 days after the work completed we began to notice intermittent blinking on lights across both upstairs and downstairs lights and on lamps plugged into sockets. There is no rhyme nor reason to the blink – it doesn’t matter if any appliances are running or none, so we’ve ruled out a surge due to boiler, fridge, etc.

We spoke with the electrician who did the work, they inspected the connections at the board and said everything looked fine and they suggested it was likely to be a supply issue. Powergrid came out, inspected and setup voltage recording device and left that running for about 8 days. They say that there is no fluctuations from their side that would cause “flicker” so have said it’s not an issue from their end.

I’ve spoken with the electricians who did the install again, but they seem void of any idea on what to look for or what could be causing this problem.

Does anyone on this forum have experience of similar issues being related to anything non-supply related – so from the board onward internally? Is it possible a fault could be present on the board itself?

From searching google, there’s lots of suggestions that flicker on all circuits including sockets is likely to be a supply issue, but this isn’t really what I’d call a flicker. It’s a very short blink. More noticeable on filament bulbs than the LED types. Not ever so frequent enough to cause headaches or anything, but frustrating, annoying and worrying as I have 2 young kids and I am really paranoid about electrical safety (which is kind of the reason we had the old fuseboard replaced in the first place!).

Thanks in advance for any advice or ideas offered.

 

[MDJ]

It could be the main switch is not connected to the busbar properly and when there is load on the board it is making the circuits flash, get the sparks back to treble check all connections. If they refuse to do so, get a spark in to sort it, get his report and send the company the invoice.

 

[telectrix]

a favourite is the busbar incorrectly fitted to 1 or more MCBs. if you are competent to do this safely, with the board turned OFF at main switch , pull off the busbar cover and use a mirror if necessary to see if the busbar is behind the cage clamp. Remember to replace busbar cover before swiychting back on. DO NOT ATTEMPT UNLESS COMPETENT TO DO SO.

 

[Pete999]

Hi there,


I should start by saying I am not an electrician, but am after some advice as we have a problem that we aren’t getting any answers on.

In January, we had a new fuse board installed to replace an old edition one. This is a recent Wylex model with circuit breakers. The electricians who installed it also added some outdoor lights, a couple of sockets in the kitchen and updated a few sockets around the house for us.

Approx 10 days after the work completed we began to notice intermittent blinking on lights across both upstairs and downstairs lights and on lamps plugged into sockets. There is no rhyme nor reason to the blink – it doesn’t matter if any appliances are running or none, so we’ve ruled out a surge due to boiler, fridge, etc.

We spoke with the electrician who did the work, they inspected the connections at the board and said everything looked fine and they suggested it was likely to be a supply issue. Powergrid came out, inspected and setup voltage recording device and left that running for about 8 days. They say that there is no fluctuations from their side that would cause “flicker” so have said it’s not an issue from their end.

I’ve spoken with the electricians who did the install again, but they seem void of any idea on what to look for or what could be causing this problem.

Does anyone on this forum have experience of similar issues being related to anything non-supply related – so from the board onward internally? Is it possible a fault could be present on the board itself?

From searching google, there’s lots of suggestions that flicker on all circuits including sockets is likely to be a supply issue, but this isn’t really what I’d call a flicker. It’s a very short blink. More noticeable on filament bulbs than the LED types. Not ever so frequent enough to cause headaches or anything, but frustrating, annoying and worrying as I have 2 young kids and I am really paranoid about electrical safety (which is kind of the reason we had the old fuseboard replaced in the first place!).

Thanks in advance for any advice or ideas offered.

Sorry to hear about your problems Luke, did you have these flickering problems before you had your CU changed? When you called the Electricians back due to the problem, you say they looked at the connections in the CU and all looked OK, but did they actually check the soundness. tightness of all the connections? it's all very well them saying it looks OK but that's not the answer, checking the integrety of the connections would be the best option,
does the flicker occur randomly, is there any vibrations that may cause a loose connection to make and break, you say you have a couple kids, and we all know what they are like slamming doors etc.
Maybe one of the Forum Members close to your location, could offer to come and take a look, you're a bit to far away for me to offer, hope you get it sorted.
One more thing did the Electricians leave any certificates/paperwork with you when they left? you should have been in receipt of an Electrical Installation Certificate (EIR) on completion of the works.

 

[FatAlan]

Would really p*** me off if there were no issues before work was done and after so called ‘professional’ had conducted work that resulted in an issue, that ‘professional’ showed little interest in getting it fixed. You sure they were competent to do the work in the first place?

 

[Lukeowl]

Hi, thanks for the reply.

Yes, they checked the tightness of everything and I stood over them while they did it. In fairness, they've been very good, but seem stumped as to what the issue can be.

Yes, we have received the EIR paperwork and certificates.

This wasn't happening prior to the work being carried out, which is why I am making that link.

I also know for a fact that we didn't notice it in the immediate few days after the installation either - it was approx 9-10 days after that we begun to notice it.

The flicker is random - no vibrations - happens in all rooms at all different times of the day, even when kids are asleep.

It is really weird - there is no logical starting point to look for a fault as it is displaying on the upstairs lighting circuit, the downstairs lighting and also across table lamps plugged into sockets both upstairs and downstairs.

The one other thing that they did change was a previous shared neutral on the landing - they made use of a redundant cable that used to run to an old whirlpool bath pump that is was no longer in use to provide a neutral to the upstairs hall light. I have wondered if that could be a root cause, but then not sure why that would affect the sockets as well.

 

[shaun1]

If you have any high load apliences sutch as a shower or oven, or an electric heater, try switching these on and off and see if it affects the lights. A very slight dimming is normal but if its quite significant that could indicate a poor connection.

If you can get the electricians back, try and persuade them to remove and reterminate all the connections, including re fitting the busbars and neutral links to RCDs etc, and check both sides of the main switch. Any poor connections may become obvoius then, as if they have been arcing there will be some carbon buildup at the connections.

It could also be the connection of the meter tails into the meter that have worked loose if they were disturbed when the new board was fitted.

If you/they can get access to an IR camera this could help trace any high resistance connections whilst everything is switched on.

 

[Pete999]

Hi, thanks for the reply.

Yes, they checked the tightness of everything and I stood over them while they did it. In fairness, they've been very good, but seem stumped as to what the issue can be.

Yes, we have received the EIR paperwork and certificates.

This wasn't happening prior to the work being carried out, which is why I am making that link.

I also know for a fact that we didn't notice it in the immediate few days after the installation either - it was approx 9-10 days after that we begun to notice it.

The flicker is random - no vibrations - happens in all rooms at all different times of the day, even when kids are asleep.

It is really weird - there is no logical starting point to look for a fault as it is displaying on the upstairs lighting circuit, the downstairs lighting and also across table lamps plugged into sockets both upstairs and downstairs.

The one other thing that they did change was a previous shared neutral on the landing - they made use of a redundant cable that used to run to an old whirlpool bath pump that is was no longer in use to provide a neutral to the upstairs hall light. I have wondered if that could be a root cause, but then not sure why that would affect the sockets as well.

Bit naughty that last bit Luke, sounds like they had some RCD tripping problems and took the roughest route out of the problem, not something I would do, neither I suspect would anyone else, could be wrong of course.

 

[Lukeowl]

Thanks for all the replies everyone - really appreciate it.

I've just called to arrange a return visit from the electricians for a couple of weeks time - they are going to check all the connections and busbars again and also investigate the neutral that they took that existing cable for - they have even suggested putting that back as it was to see if it stops the issue. Not sure if that would be the cause though as it's happening on the sockets too.

@shaun1 - There doesn't seem to be any impact to the lighting when we put the oven on. The shower is a thermostatic valve mains pressured so that wouldn't give an indication. We have an electric fire that we don't really make much use of - I will try that this evening to see if that has any impact.

 

[Lukeowl]

Bit naughty that last bit Luke, sounds like they had some RCD tripping problems and took the roughest route out of the problem, not something I would do, neither I suspect would anyone else, could be wrong of course.

Indeed they had RCD tripping issues. They returned the following day with the intention of running a new cable from the board under the stairs up to the attic space above the light in the hallway. When they were seeking the easiest route to run the cable, they found the old cable that had been disconnected from the old bath pump and suggested using that as it was already there and would be less disruptive. I agreed because it made sense. Like I said above though, I am not sure if that would cause all the circuits to display these blinks?

Another point to add - we aren't experiencing any other issues with anything plugged into the sockets - TV's, chargers, radio, kettle, large appliances, etc - all running as normal.

 

[Pete999]

Indeed they had RCD tripping issues. They returned the following day with the intention of running a new cable from the board under the stairs up to the attic space above the light in the hallway. When they were seeking the easiest route to run the cable, they found the old cable that had been disconnected from the old bath pump and suggested using that as it was already there and would be less disruptive. I agreed because it made sense. Like I said above though, I am not sure if that would cause all the circuits to display these blinks?

Another point to add - we aren't experiencing any other issues with anything plugged into the sockets - TV's, chargers, radio, kettle, large appliances, etc - all running as normal.

Thanks for the update

 

[PEG]

Indeed they had RCD tripping issues. They returned the following day with the intention of running a new cable from the board under the stairs up to the attic space above the light in the hallway. When they were seeking the easiest route to run the cable, they found the old cable that had been disconnected from the old bath pump and suggested using that as it was already there and would be less disruptive. I agreed because it made sense. Like I said above though, I am not sure if that would cause all the circuits to display these blinks?

Another point to add - we aren't experiencing any other issues with anything plugged into the sockets - TV's, chargers, radio, kettle, large appliances, etc - all running as normal.

Hi,this would cause me to wonder,if they did adequate testing,prior to the fitting of the new DB,and,afterwards.

A few days later,is not the time this issue should have come to light.

Are the lighting circuits fed from one or two MCB's?
Where did the feeds originate from,for the outside lights?
Have the MCB's been removed and inspected,or just tightened?

 

[Pete999]

Hi,this would cause me to wonder,if they did adequate testing,prior to the fitting of the new DB,and,afterwards.

A few days later,is not the time this issue should have come to light.
Reckon you are spot on there PEG they must have had a tripping RCD problem, typical borrowed N on the two lighting circuits= no initial testing, connect up, conduct bang test etc.
Are the lighting circuits fed from one or two MCB's?
Where did the feeds originate from,for the outside lights?
Have the MCB's been removed and inspected,or just tightened?

 

[Lukeowl]

Hi,this would cause me to wonder,if they did adequate testing,prior to the fitting of the new DB,and,afterwards.

A few days later,is not the time this issue should have come to light.

Are the lighting circuits fed from one or two MCB's?
Where did the feeds originate from,for the outside lights?
Have the MCB's been removed and inspected,or just tightened?

Hi, thanks for the reply.

They are fed from 2 MCBs. One for upstairs and one for downstairs. As I understood it (I was at work while the work took place, my wife was home), when they connected it all up the lights kept tripping upstairs - so the options we were given were to leave the borrowed neutral as it was and only have them on a single MCB or to connect a new neutral to the board and the light - which is how we got to the scenario mentioned above where they utilised the existing disconnected cable.

The feeds from the outside lights - no idea on that. They are on a separate switch on the board (not sure if that indicates where they originate?) excuse my ignorance on this - I'm not electrically minded

The MCB's have not been removed and inspected - it was just a tightening that was performed.

 

[Octopus]

Just tightening isn't good enough ...

Make sure they check that the mcb's are clamped properly and the buzz bar is held securely ..