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Old 12-15-2017, 11:52 AM   #1
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Iím hooking up some equipment sent by others and came across a funky control drawing. IMO its a violation of ul508a but I thought I would see what everyoneís consensus was. the 5 devices shown in the drawing are all in separate enclosures.


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Old 12-15-2017, 01:01 PM   #2
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Is each enclosure listed separately as a UL508A Industrial Control Panel? How is the equipment Marked?

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Old 12-15-2017, 02:25 PM   #3
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Is each enclosure listed separately as a UL508A Industrial Control Panel? How is the equipment Marked?

Chris


Marked as ul508 compliant, but being a panel shop myself, I say that having no overcurrent protection for the control circuit leaving the enclosures is a violation. Along with not having a disconnecting means for the control circuit when it enters the 2nd starter. Also just not a fan a taking one leg from starter 1 and 1 leg from starter 2 to make the control circuit.


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Old 12-16-2017, 01:29 PM   #4
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Your points are valid even as an NEC issue.
But UL508 and UL508a are different things. 508 alone just means the components are UL listed. 508a means the ASSEMBLY as a whole is listed. Sometimes OEMs try to get away with not having to pay a UL508a panel shop by using separate UL listed enclosed parts and wiring them together, then taking advantage of the semantics of saying "UL 508 listed controls". In reality it's a dodge and in this case, puts the burden of making the system NEC compliant on the installer. No bueno.
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Old 12-16-2017, 11:18 PM   #5
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Your points are valid even as an NEC issue.
But UL508 and UL508a are different things. 508 alone just means the components are UL listed. 508a means the ASSEMBLY as a whole is listed. Sometimes OEMs try to get away with not having to pay a UL508a panel shop by using separate UL listed enclosed parts and wiring them together, then taking advantage of the semantics of saying "UL 508 listed controls". In reality it's a dodge and in this case, puts the burden of making the system NEC compliant on the installer. No bueno.
Marked as 508a compliant, even has the file number.
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