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Any electricians about? Need help with problem with lighting circuit.

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I recently wired (with my dad's help!!!) a new light for a bedroom where there was no light before. When you turn it on the light starts to light up for a split second then gives up. If you turn it of…
Benjimoron Avatar
7y, 8m agoPosted 7 years, 8 months ago
I recently wired (with my dad's help!!!) a new light for a bedroom where there was no light before. When you turn it on the light starts to light up for a split second then gives up. If you turn it off again and wait a few seconds you can then get another split second of light by turning it on again! Can't work out why it isn't working? Surely there's either electricity or there's not? No circuits trip out or anything. I've replaced the bulb holder part (not sure what the technical name is) but that made no difference. Have tried different bulbs and again no difference.

Is the problem likely to be in the switch, don't think either of us have changed that part. Only other thing it could be is the wires/wiring I assume but I really don't want to have to take the board up in the loft to get at it again.

Any help appreciated.

Thanks!!!
Benjimoron Avatar
7y, 8m agoPosted 7 years, 8 months ago
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#1
Sounds like some kind of trip which is reseting when you leave it off for a while. Recheck wiring. Check the switch to see if it has any electronics/dimmer circuit etc. Assume there was some kind of light somewhere as the switch was already in?
banned#2
ide replace the switch, if that doesnt sort it then its gonna have to be the lifting of the floor boards
#3
the lights are on a circuit and if the correct wires are used it can send the circuit haywie different switches will control different lights and dim different lights
#4
Where does the supply to the light come from?

p.s I wouldn't keep turning it on and off you could be shorting numerous wires out which could lead to the cables melting, fire and ultimately death. Don't want to scare you though. In fact take the bulb out for now as you don't kow whether it's live when off.
#5
marmalade47
Sounds like some kind of trip which is reseting when you leave it off for a while. Recheck wiring. Check the switch to see if it has any electronics/dimmer circuit etc. Assume there was some kind of light somewhere as the switch was already in?


Totally new light, basically one big bedroom made into two. Not sure exactly how we did it but the other bedroom's light was done the same way and works fine.

No dimmer stuff, very basic equipment (that's what she said!).
#6
sassie
ide replace the switch, if that doesnt sort it then its gonna have to be the lifting of the floor boards


I think that's what's gonna have to happen. Just wondering if anyone knew why it was happening before I go replacing each but one by one!
#7
the sedge
the lights are on a circuit and if the correct wires are used it can send the circuit haywie different switches will control different lights and dim different lights


Everything else works fine mate, just this switch only turns the light on for a split second.

If it was short circuiting wouldn't the system trip out. From what I remember the whole thing is very sensitive so it would trip at the drop of a feather.
#8
Benjimoron
I think that's what's gonna have to happen. Just wondering if anyone knew why it was happening before I go replacing each but one by one!


Why do you have to lift floorboards, do you live in a bungalow/downstairs bedroom?
#9
greg_68
Where does the supply to the light come from?

p.s I wouldn't keep turning it on and off you could be shorting numerous wires out which could lead to the cables melting, fire and ultimately death. Don't want to scare you though. In fact take the bulb out for now as you don't kow whether it's live when off.


Been off and out for ages mate.

Supply comes from the same place that the original light came from (and the same place the other bedroom's light comes from (which works fine)).

If it was shorting wouldn't the system trip out?
#10
thesaint
Why do you have to lift floorboards, do you live in a bungalow/downstairs bedroom?


Converted loft.
#11
Benjimoron
Everything else works fine mate, just this switch only turns the light on for a split second.

If it was short circuiting wouldn't the system trip out. From what I remember the whole thing is very sensitive so it would trip at the drop of a feather.


yeah it would trip the system in milli seconds what sort of light is it a ceiling rose type with a normal bulb or the new low voltage one
#12
Benjimoron
Converted loft.


So did you lift them originally? If so, then it shouldn't be too hard to lift again?
Personally, I would start again from scratch.
#13
So you've broken into the circuit that fed the light in the next door bedroom?
#14
the sedge
yeah it would trip the system in milli seconds what sort of light is it a ceiling rose type with a normal bulb or the new low voltage one


Just a standard, haven't seen any new low voltage ones but this is the same sort of thing that has always been around.
#15
thesaint
So did you lift them originally? If so, then it shouldn't be too hard to lift again?
Personally, I would start again from scratch.


They weren't there when we started the work!
#16
You need to check you have a crcuit with a meter or voltage checker. Circuit = live wire into switch, live out to Live terminal on light, other terminal on light to neutral. NB any metal parts have to be earthed. If your not sure get help from someone who knows, electricity can be lethal!
#17
greg_68
So you've broken into the circuit that fed the light in the next door bedroom?


if youve broken the circuit you need to bring a wire from the old light and then onto the next light in the circuit after the old light. i dont think you can just spur from the old light if you have then that will be your problem
#18
Benjimoron
They weren't there when we started the work!


No need for the exclamation mark, was only trying to help.
Sorry you can't reply to this thread. :-(
#19
sorry not very clear forget what uve done you need to ... bring cable from old light into the new bedroom light and then from the new bedroom light take a new cable to the next light on the circuit after the old light and take away the old cable between the old light and the next one in the circuit.

thats not very clear either ill try and think of a better way to explain
#20
right the circuit goes from the concumer box toone light to another to another etc and then back to the consumer box . you need to break that circuit with the other light so eg light A goes to light B then to light C. say you want to add a light between B and C we call Z . the main cable needs be taken away between B and C and a new one Btween B and Z and between Z and C is that easier to understand
#21
heres a link how to wire the rose and switch can be a bit tricky if youve not done it b4
http://www.ultimatehandyman.co.uk/diy/electrics/light_fitting/ceiling_rose_wiring.htm
#22
the sedge
is that easier to understand


He's suspended, he can't reply. :)
#23
wow they suspend you for asking for electrical help now.:w00t:

Man this sites tough.
#24
oh wot did he do wrong
#25
huh :?

seemed an ok thread to me :thinking:
#26
I had the exact same problem with a low voltage light, turned out the transformer was faulty inside it.
New transformer and light has worked ok ever since. :thumbsup:
#27
I recently wired (with my dad's help!!!) a new light for a bedroom where there was no light before.


Is the problem likely to be in the switch, don't think either of us have changed that part.


If there was no light, what was the purpose of the switch :p

Probably is the switch btw. Sounds like a bad contact that's making then instantly breaking.
#28
Shengis;5642323
If there was no light, what was the purpose of the switch :p

Probably is the switch btw. Sounds like a bad contact that's making then instantly breaking.


Yeah that sounds likely to me too, its probably 'making' as its partway pressed and 'breaking' when fully 'on'. Try pressing it halfway...

But if they are low-voltage lights (ie halogen spots) then it may very well be the transformer/circuit internal to the light fitting :thumbsup:
banned#29
is your dad an electrician then?

Bit dodgy if not and would probably invalidate your insurance in the event of a fire etc

dont the council have to issue a safety certificate these days for electrical work?
#30
Shengis
If there was no light, what was the purpose of the switch :p

Probably is the switch btw. Sounds like a bad contact that's making then instantly breaking.


I mean as in I have replaced the light fitting from the one we put in first. ie I have tried 2 light fittings and 2 bulbs. I have only tried the original switch that we put in (for this light), I haven't tried replacing the switch but may do soon.
#31
csiman

dont the council have to issue a safety certificate these days for electrical work?


Don't know mate, you offering to come fix it for me??
#32
Benjimoron
I mean as in I have replaced the light fitting from the one we put in first. ie I have tried 2 light fittings and 2 bulbs. I have only tried the original switch that we put in (for this light), I haven't tried replacing the switch but may do soon.


Tried bridging the wires at the switch? If it stays on the switch is ******ed, if not theres something wrong in your dodgy wiring. Lighting circuits are a pain.
banned#33
Benjimoron;5651263
Don't know mate, you offering to come fix it for me??

no lol!

I take it you used a new one way switch and the correct thickness of cable? I hope you didnt use mains cabling lol.
#34
tell you what mate
im two years through an an electrician course and i still dont get it!!
i think as THE SEDGE has said,check the site he said

http://www.ultimatehandyman.co.uk/di...ose_wiring.htm 01-07-2009 22:27


i been following this thread,hoping i might learn sumtin
but i agree,its probably connections IN the switch
but f**ked if i know
#35
csiman
no lol!

I take it you used a new one way switch and the correct thickness of cable? I hope you didnt use mains cabling lol.


Don't know mate, ask my dad!

Normal standard switch afaik. Don't have a clue about the cable, although it's the same cable as we used for the other light and that works fine.
#36
Shengis
Tried bridging the wires at the switch? If it stays on the switch is ******ed, if not theres something wrong in your dodgy wiring. Lighting circuits are a pain.


You mean just join the wires in the switch somehere when the power is off then turn power on and see if the light is on? Like doing a switch but manually?
banned#37
actually Benji,

I should have mentioned screwfix from the off.

great forum with lots of pros on there with really quick and helpful advice.

http://www.screwfix.com/talk/index.jspa?ts=01959
#38
Benjimoron
You mean just join the wires in the switch somehere when the power is off then turn power on and see if the light is on? Like doing a switch but manually?


Yeah.
#39
Shengis
Yeah.


Ah, good idea! Wish me luck, lol!!!
banned#40
jeeps, the easiest way to check is change the switch, whats with all the faffing about

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