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Can anyone explain why they gave an exception to using a 'in use' weatherproof receptacle cover if you using a routine high-pressure spray washing? 2011 NEC 406(B)(1).

It appears one would need it (in use cover) more when spray washing is going on.

This issue came up and there was a debate on whether or not an 'in use' cover is required or not.
 

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because an in use cover is useless for high pressure spray down, everything inside is gonna get soaked.
 
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