Discuss HELP energy saving lamp flickering whilst off in the Industrial Electrician Talk area at ElectriciansForums.net

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salisbury spark

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2 way circuit - all works okay
When switch off - left with 32vac on circuit causing lamp to flicker....
Unplug lamp get 0v on circuit
Plug in normal bulb 0v on circuit
Plugged in another different energy saving lamp get 18v ac - with the switches OFF!!!!!
Take lamp out no volts accross lamp(checked just in case)

Circuit goes into breakout box - so have s/L and N at batten

Checked for earth fault from lights to sockets - 0.4 ohms

With no volts on this circuit get upto 32 volts when plug in energy lamps?

All readings taken on L and E

Old wiring (metal ccu)

Any ideas welcome.
 
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B

BEN5637

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  • #2
hey man, have had a few jobs whereby low energy lamps flicker while off. why? i dont know. all I do know that its a common thing to happen, more noticiable at night and only occuring on 2way switches
 
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G

GAZHUDDS

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  • #3
This is quite common, its caused by capacitive leakage in the strappers. I think its got something to do with the inverters in the lamp, but dont take my word for it.
 
S

salisbury spark

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  • #4
Thought it might be leakage between the insulation of the cable as nowhere else it can come from.

Tried it on a 1way circiut in my house and get 18 volts with an ESL in circuit.

What concerns me is maybe the more u add the higher the voltage on the installation. - If it gets over 50 volts isnt that starting to be dangerous?(from hazy memory).- wonder if the current would be there anyway because of the resistance of the cables.

Thanks guys for your replies

Have a couple of these will have to see if volts increase the more lamps added as my customer has several in circuit and i was measuring 32 volts
 
R

rumrunner

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  • #5
Thought it might be leakage between the insulation of the cable as nowhere else it can come from.

Tried it on a 1way circiut in my house and get 18 volts with an ESL in circuit.

What concerns me is maybe the more u add the higher the voltage on the installation. - If it gets over 50 volts isnt that starting to be dangerous?(from hazy memory).- wonder if the current would be there anyway because of the resistance of the cables.

Thanks guys for your replies

Have a couple of these will have to see if volts increase the more lamps added as my customer has several in circuit and i was measuring 32 volts
Is it not due to a capacitor in the ESL? How can current be there because of the resistance of the cable? ,and if it was "leaking" then an insulation resistance test should show it up
have fun:)
 
S

salisbury spark

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  • #6
energy saving lamp flickering whilst off

Tested for any volts(capacitance)accross esl - none
Does the same in my house with my esl lamp?

A insulation test was in order but as not charging customer (giving estimate) - werent gonna mess around.

Will have to try insulation test on my old wiring at the w/e just to see.

Will try esl in and kill supply to lights/rcd - even dissconnect at CCU to try and find where this voltage is coming from.

TBC


MARRIED MEN- watch your wedding video backwards -you give the ring back - walk back to the car and drive off - if only......
 
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rumrunner

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  • #7
Yes its interesting ,please post back when you discover the problem
 
B

BEN5637

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  • #8
am pretty sure that it is not a cas of poor insulation resistance. as far as I know it is literally just a "peculiarity" of the lamp and its internal workings
 
P

prideofengland

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  • #9
Salisbury Spark
Have you got a security swich connected on the circuit anywhere? This is the only time Ive come across the problem, turns out there not compatible with energy saving lamps.
 
A

Andy M

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  • #10
I had this on a job once, and again it was on a landing light 2-wayed

we put it down to an induced voltage as the 3 - core (2 way conversion) ran through the same holes as all the final circuits. (mutual inductance ?)

Since then i have encountered Induction Loop problems with Hearing Aids in a Church again on a 2 way with Low energy lamps fitted. (page 63 On site guide)

Not sure that i have helped?
 
S

sparkyork

i had this the other week when i changed a consumer unit. again was also the landing light on the 2 way, with energy saver fitted. mine was wired in twin strappers with single sw/wire coming from landing light switch to the rose. i also had a borrowed neutral situation that was another story, but as soon as i rectified the borrowed neutral i tried the energy lamp again and it didnt flicker.
 
M

mdshunk

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  • #12
I'm going with the poltergeist theory. The corrective action is to hire a priest or an exorcist to get the devil out of your light fittings.
 
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M

ms&electrical

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  • #13
i was called to repair a same fault a while ago on a 2way circuit. with around 50v when off and flikering... found 2way wiring in 2core and earth with earth used as the third live common core!!! rewired in 3 core and earth and when off 0v with no flikering. hope this helps
 
S

salisbury spark

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  • #14
REPLY TO PRIDE OF ENGLAND

Got a pir security light on my installation -and customer had an outside light (dont know if pir)

At the w/e will run a separate new cable off a reel from the ccu and try this while disconnecting the other circuits - to see if can make 'fault' go away -if so what is contributing to the voltage?

TBC
 
P

prideofengland

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  • #15
Salisbury Spark

PIR security light shouldnt effect it. When I said security switch I meant those timer switches, fits in place of a normal light switch and can be set to come on/off when your on holiday to make it look like someones in. Had another one Friday flickering like mad but ok with normal lamp.

Sorry for confusion. Let us know if you find out the cause.
 

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