Class III div. 1 - what Panelboard

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mjmike

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Ok, working on a woodworking facility classified as Class III division I. I am reading the code regarding this specifically (2005 code) 503.115 which states "switches, circuit breakers, motor controllers, and fuses, including pushbuttons, relays, and similar devices, shall be provided in a dusttight enclosure." I believe this is just for disconnects and enclosed CB's, but does a panelboard fall under this where I just need a dusttight enclosure like a NEMA 5 enclosure? Nowhere in article 503 does it state a panelboard must be identified for a Class II environment. All panels I have found for a Class III are basically the same as what would be used in a Class I environment.

Under 503.135(A) it specifically says a heater must be identified for Class III. Using this as an example, the code does not say this for panelboards.

Any thoughts? Thanks
 
Since the panelboard will contain circuit breaker then 503.115 would apply. Can this panel be placed outside the fiber/dust environment?
 
Then you will need a NEMA 5 or 12 enclosure.
Look at NEC 500.7(D) for purging and pressurization. This method may be another way to achieve the protection required.
 
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