Q. For a 20A, 125V, single-phase receptacle that supplies power to a cord-and-plug connected metering pump, which is integral to a continuous industrial process that cannot tolerate an unexpected loss of power, installed outdoors in an industrial facility, the 20A receptacle __________. Note that qualified personnel maintain this industrial facility and an assured equipment grounding conductor program is in place.
In general, all 15A and 20A, 125V, single-phase receptacles installed outdoors require GFCI protection. This is a change in the 2008 NEC [210.8(B)(4)(Exceptions 2 to 4)]. There is an exception to omit GFCI protection in an industrial facility where qualified personnel maintain the installation and an assured equipment-grounding program is in place to assure protection for personnel if those receptacles would create a greater hazard if the power were interrupted.
Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at firstname.lastname@example.org.