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What is the purpose of the screw installed in the bottom of the enclosure on a NEMA Type 12/3R (AWK suffix) Heavy Duty Safety Switch?

What is the screw at the bottom of the Safety Switch for?

Product Line:
Heavy Duty Safety Switch

Applies to all NEMA 12/3R Heavy Duty Safety Switch

Product Feature

The screw is a drain screw and should be removed for an outdoor, NEMA 3R application to provide a drain hole. The screw should remain in the bottom endwall of the switch is used in an indoor, NEMA Type 12 application. 
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