I have a UPS (2200VA) that came with both a straight 15A plug and a non locking 20A plug. We're currently using the 15, but are moving offices. My new computer room has 2 30A twist lock outlets (each ...
I always *gently* rock the wratchet/extender/socket from side to side a few times before attempting to remove it from the plug. Never had any problems with that method.
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