Replacing capacitors in a Explosionproof motor

[prmmel]

Is it legal for a licensed electrician to replace a capacitor in a single phase explosion-proof motor? Baldor stated today that the motor looses its UL rating unless the capacitor is replaced in a UL motor shop. Very inconvenient for a 10 minute repair.

The motor capacitors are replaced by removing the tension rods, removing the rear cover, unplugging the bad capacitors, plugging in the new ones and then reassembling the cover. No different in my mind that servicing components inside an explosionproof junction box.

 

[DRWeig]

My understanding:

UL listed exlosionproof enclosure (UL 1203): You can put just about anything you want in there, and service what you put in there (being careful to torque the bolts properly and avoid scratching the flanges). Things that pierce the enclosure (pilot lights, switches, breaker operators, etc.) must be done by a UL hazardous locations panel shop or the enclosure manufacturer, though.

Listed custom explosionproof control panel (UL 698a): You can make the designated field connections only. Servicing a failed component that was installed by the panel shop is possible, if replacement component is exact make and model as originally installed by panel shop. The replacement make and model must also still be UL listed under same category code as it was at time the control panel was made. If not, panel must be returned to UL shop for repair.

Listed motor (UL 674) is a factory assembly. Opening it up in any way voids the UL listing completely unless done at a UL motor shop or at the original factory.

Sorry for the disappointing answer. Wait and see though, others may have experience with ways around it...

Good on ya,

Goober Dave

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