Your most pressing National Electrical Code (NEC) questions answered
Q. Is a 15A or 20A, 125V-rated maintenance receptacle required for an outdoor evaporative cooler at a dwelling unit?
A. Not according to the Exception listed in 210.63. The basic rules is that a 15A or 20A, 125V receptacle outlet must be installed at an accessible location for the servicing of heating, air-conditioning, and refrigeration equipment. The receptacle must be located within 25 ft of, and on the same level as, the heating, air-conditioning, and refrigeration equipment [210.63]. However, the exception states areceptacle outlet isn't required at one- and two-family dwellings for the service of evaporative coolers.
A receptacle outlet isn't required for ventilation equipment, because it's not heating, air-conditioning, or refrigeration equipment.
The HACR receptacle must be GFCI-protected if located outdoors [210.8(A)(3) and 210.8(B)(5)] or in the crawl space or unfinished basement of a dwelling unit [210.8(A)(4) and 210.8(A)(5)].
The outdoor 15A or 20A, 125V receptacle outlet required for dwelling units [210.52(E)(1)] can be used to satisfy this requirement.