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Burned Socket - New 8' HO

Zrxpilot

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Nov 19, 2011
Messages
62
Not sure what happened here. Recently installed 3, 8' H0 two lamp 110w t-12 fixtures that I bought from Menards. Cheap ones at like $50.00 each without bulbs. The only model they had that was meant for flush mount in lieu of a chain mount.

Did it right I think. 20 amp isolated breaker, 12 g wire, 20 amp switch. The whole nine yards in EMT. The entire max draw is about a 1000 watts including 5 standard 75 watt lights that run conventional light bulbs.

The install went fine and everything worked as it should. No flickering, no buzzing. All was well until last night

I was hanging out in the garage and had a fire going. About 3 hrs into the evening one of the bulbs literally fell out of the fixture. Luckily it didn't hit anyone and the bulb was incased in a clear protective tube. As you can imagine, it made quite a noise and the bulb shattered.

Before it fell out, I heard a buzzing noise for about 3 seconds. Giving the fixture a quick look I see one of the spring loaded sockets is severely melted.

Shut down the power to these lights and pulled the other bulb. Haven't had a chance to look under the fixture covers yet.

Not sure ill find anything obvious. Couple things I did notice. Not sure its a coincidence or not but this light is the closest to my fireplace in the garage and would be subject to some rapid expansion of the fixture. At this same location the rafters are not quite level at the ceiling (which is covered in steel sheet) and perhaps the fixture is bowed somewhat causing perhaps not a perfect bulb alignment with the fixture housing

Maybe these inexpensive lights from Menards are faulty.

Guess I wont know until I get up there and look at it. Not sure what it is I will be looking for. Could be lots of things I guess. Bare hot wire hitting the fixture. Who knows.
 
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jhelrey

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They melt when the bulb isn't fully seated and the pin makes contact with the side. I've replaced them numerous times when business owners decide to DIY.
 
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Zrxpilot

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Nov 19, 2011
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62
^ That's what I thought too. Seemed too easy tho.

With the clear plastic tube surrounding the bulb, its a bit difficult to feel if you have it in the socket properly.

That being the case, is it possible to just replace the socket?
 
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jhelrey

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Yes, HD sells them on the same shelf as the ballast. Just look up at eye level.

Cut the wires close to the holder, slid it out, slide new one in, push wire in, reattached bracket with screws, replace center cover, and install bulbs.
 
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Zrxpilot

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Nov 19, 2011
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Found this while searching the net.

https://www.osha.gov/dts/hib/hib_data/hib19970715.html

The jest is that the investigation concluded this fire was caused (like you said) by a bulb not properly seated into the holder. The resulting heat caused the plastic cap to catch fire.

I have these plastic tubes around my lights and now thinking of removing them. The plastic tubes not only make it a bit difficult to install the bulb (hard to get a good feel if its in the socket or not) and they appear to be a fire hazard.

Sure like the way the shop is lit up now. 3 - dual lamp 8' HO T-12's lit the shop up nicely.

Shop is 18' wide x 60' long.
 

Norcal

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Mar 16, 2008
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13,769
The tube guards yellow in addition to just being a PITA.
 
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