gu10 mains lamp blowing

[james king]

hi all i have changed 6x gu10 downlights in a kithchen as the down lights befor kept blowing there were LV.

what may cause the lamps to blow regualy eg only 3-4 hours of being on? all suggestions would be grat

 

[Deleted member 9648]

Most likely rubbish lamps.
Second most likely insufficient ventilation.
Check voltage is within acceptable limits as well

 

[james king]

no lamps are good! so how come the lamps befor (LV) kept blowing aswell

insufficient ventaltion???

 

[Deleted member 9648]

Insulation over the top?
In the end if quality lamps are fitted to correct fittings with adequate ventilation,acceptable voltage and not subject to vibration etc they will last a reasonable time.

 

[Deleted member 9648]

May have misunderstood...are the GU10's blowing?or was it only the LV lamps which you have replaced with GU10?

 

[james king]

both the LV

and the GU10 lamp blow after about 4 hours four of the six go. there is clear ventilation no insulation over them. the new down lights are fire rated. all test seems ok >99 IR and 0.89 R1+R2

 

[james king]

am i correct in saying that GU10 lamps have a rating of 230V and say the Volts are 238 may be that may cause them to go??

 

[Hawk81]

am i correct in saying that GU10 lamps have a rating of 230V and say the Volts are 238 may be that may cause them to go??

I really do not think 8v will make the lamps blow.

 

[southwalesspark]

loose connection on the neutral somewhere along the line.

 

[james king]

ok maybe more i dont know im jusy asking and trying to learn

 

[james king]

can u explain why the loose connection of the N would effect the lamps going?

 

[Hawk81]

ok maybe more i dont know im jusy asking and trying to learn

You are right to ask and learn. and to try and think of all options. Is it the same four that blow as the four ELV lamps that kept blowing?

 

[robsparky1975]

lamps genarally have a tolerance,sounds just like poor quality lamps,halogens are so hit and miss,some last years,my bathroom ones have lasted 8 years(hope i dont tempt fate here)no failures,others like my kitchen go regular,although they might look pretty,downlights can be a real pain,the next client to ask me to fit a load im gonna recommend led spots as the saving over time pays.

 

[james king]

so i think what i shell do is do a continutity test between L-N and N-E so test for loose connection? what do u think. i fitted 6x low enegry lapms when i fitted them and they did not blow!! but she didnt like the light and wanted GU10 buls insted since then 4 have gone

 

[james king]

would that test be a start?

 

[Deleted member 9648]

Are you sure they are only lasting a few hours?...customers often say they have only lasted a short time when in reality they have got mixed up with what has been replaced. A loose connection serious to cause lamp failure would almost certainly produce noticable flickering.
I would still suggest it is lamps..(see robsparkys post)....try a different batch of a quality brand and get the customer to keep a plan of which lamps blow and when.

 

[james king]

hi all just to let u no i have been back and its not the lamps. they are fine and so are the fittens.. who ever wired it befor have done some thing wrong.

i have 230V between L&N
230V between N&E
0V between L&E

 

[telectrix]

definitely a wiring fault.

 

[james king]

thanks lol

 

[Deleted member 9648]

hi all just to let u no i have been back and its not the lamps. they are fine and so are the fittens.. who ever wired it befor have done some thing wrong.

i have 230V between L&N
230V between N&E
0V between L&E

Wrong polarity....the N and L are reversed......needs rectifying but wont affect lamp life.

 

[DaveyD]

Jiga. Alright? Did you get this resolved? If so what was the result please.

 

[Farmelectrics]

i agree with wirepuller wrong polarity wouldnt affect lamp life