277v LED can with 120v thermal? - Page 2 - Electrician Talk - Professional Electrical Contractors Forum
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Old 02-12-2015, 12:21 AM   #21
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I'm not sure unless the higher voltage combined with the resistance if the smaller thermal actually caused it to reach its trip temperature pre-maturely.
My thoughts are that the thermal responds to ambient.
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Old 02-12-2015, 12:24 AM   #22
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Quote:
Originally Posted by RIVETER
My thoughts are that the thermal responds to ambient.
If the thermal itself gets hot, the ambient temp won't really matter any more.
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Old 02-12-2015, 12:27 AM   #23
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If the thermal itself gets hot, the ambient temp won't really matter any more.
A thermal is just a switch...possibly a KLIXON. Where would the heat come from...other than current.
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Old 02-12-2015, 12:34 AM   #24
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I'm not sure. There is obviously something about it (the operation of the thermal) related to the voltage applied. Otherwise it wouldn't have a 120 volt rating. It would be multi voltage.
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Old 02-12-2015, 12:38 AM   #25
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Originally Posted by btharmy View Post
I'm not sure. There is obviously something about it (the operation of the thermal) related to the voltage applied. Otherwise it wouldn't have a 120 volt rating. It would be multi voltage.
As I said, a thermal is just a switch. The only problem that I know of when using a 120 volt switch in a 277volt application is that the higher voltage may possibly arc across the gap. That does not sound like your case. SMARTER people...chime in.
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Old 02-12-2015, 02:12 AM   #26
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I'm going with the theory that the higher voltage heats up the device itself, thus the cycling.
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Old 02-12-2015, 05:04 AM   #27
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The only way the thermal can trip is excess heat !
Is the thermal on the fixture or the ballast ?
It could only be on the ballast
As this is the only part that would be working harder
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Old 02-12-2015, 10:06 AM   #28
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Originally Posted by dmxtothemax
The only way the thermal can trip is excess heat ! Is the thermal on the fixture or the ballast ? It could only be on the ballast As this is the only part that would be working harder
The driver (ballast) is multi volt 120-277 so it is fine. The only component not rated for the applied voltage is the thermal. They need to replace the fixtures or run 120 v circuits for the can lights. Simply replacing the thermals is possible but would void the listing of the fixture.
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Old 02-12-2015, 10:11 AM   #29
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Originally Posted by RIVETER View Post
A thermal is just a switch...possibly a KLIXON. Where would the heat come from...other than current.
Does that look like a klixon to you? Not even close. It also does not look like the normal cheap dry contacts on most recessed. My guess is there is some solid state circuitry in those thermals.
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Old 02-12-2015, 10:27 AM   #30
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My guess is it is a 3 wire sensor and yes voltage makes a difference.
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