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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?

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

Product Line:
Heavy Duty Safety Switch

Resolution:
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 if the switch is used in an indoor, NEMA 12 application.