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Joined: Jan 2005
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Picture submitted by Waymag. He'll fill in the details:
Last edited by renosteinke; 07/24/07 07:28 PM.
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Joined: Jun 2005
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Joined: Jan 2002
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We still do not know what made this switch have a melt down. It was on a 277volt circuit and the breaker never tripped. The breaker was a Cutler Hammer Power Line c style breaker. This is also a code violation type deal because 120 and 277 were in the same box. I know the contacts inside the switch had welded together.
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Joined: Dec 2000
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The 120V switch and 277V switch can be in the same box IF the voltage between 2 adjacent switches doesn't exceed 300V. It's in 404.8(B) (I wonder what the voltage between the 2 systems is?)
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Joined: Jan 2005
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Perhaps the switch was not rated for 277?
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Joined: Aug 2001
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(I wonder what the voltage between the 2 systems is?) Best case = 157V, worst case = 397V, depending upon phasing.
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Joined: Dec 2000
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My, how simple!
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Joined: Jan 2002
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Well it had 120v and basically 480v too because the other 2 switches were 277 on a phase and 277 on b phase... 1-120v switch and 2-277 volt switches...after repullint wire back up to j box I did an amp reading and got 4 amps on the 120v switch 3.5 on one of the 277 volt switches and 1.5 on the other 277 volt switch.
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