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Original Message
RE: Receptacle grade specs
Posted by cdb on September 23, 2016 at 06:14:56:
There are only 4 grades of receptacles defined in ANSI/UL Standards.
General Use
Hospital
Federal Spec.
Combo Hospital/ Federal Spec.
All else - "Pro Line, Heavy Duty, Extra Heavy Duty, Industrial, Spec Grade, Commercial, Residential Grade" - is Marketing Dept. created. IOW there is no overarching standard governing what a "heavy duty" receptacle is. Or pickup truck, or drill, or screwdriver for that matter.
This is not to imply that there aren't differences between sub-$1.00 receptacles that come in "contractor packs" of 10 and individually packaged industrial heavy duty receptacles.
Since the below linky was written (2005), the General Use category may now have NEC required subsets of:
WR - Weather Resistant
TR - Tamper Resistant