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Joined: Mar 2003
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I need some help finding exact articles on how the following application would be a code violation:
A disconnect with one auxiliary contact was ordered for a job. Going to the Disconnect from a control panel was 480VAC, 4/C #12 SH cable for the motor, 2#12 conductors for the disconnect auxiliary contact, and 2#12 conductors for the motor thermal switch. The 2#12's for the disconnect were wired to the auxiliary contact in the disconnect. The 2#12's for the motor thermal switch were wired directly to the mts but were routed through the disconnect. So, when the auxiliary contact for that disconnect is opened it takes out the motor but the motor thermal switch is still live.
Thank you for all of your help.
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Joined: Apr 2002
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The bible is in the truck, and of course it's rainin again.
The disco must open all ungrounded conductors to the equipment. Are the 2-12s for the thermal powered?? If so, then you have to break them when the disco is opened.
John
John
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Joined: Feb 2003
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NEC 2002 404.15 Marking.
(A) Ratings. Switches shall be marked with the current voltage, and, if horsepower rated, the maximum rating for which they are designed.
(B) Off Indication. Where in the off position, a switching device with a marked OFF position shall completely disconnect all ungrounded conductors to the load it controls.
Hope this helps!
Dave
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Joined: Nov 2000
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A thermal switch is a device, not a load.
Don
Don(resqcapt19)
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Joined: Mar 2003
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Hotline1,
The motor thermal switch is connected to an I/O module which is at 120VAC. Could you provide me with a code reference?
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Joined: Mar 2001
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Opening the disconnect will not remove the 120 VAC that is provided by the IO module.
Technically, this may not be an NEC violation any more than the presence of 2 voltage sources in any single enclosure, in this case, the peckerhead. However, most electricians probably would assume that if the disconnect is open, there is no voltage present.
At the very minimum, a warning that more than one voltage source is present should be posted somewhere.
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Joined: May 2002
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