210.8(B) Other Than Dwelling Units.  All single-phase receptacles rated 150 volts to ground or less, 50 amperes or less and three-phase receptacles rated 150 volts to ground or less, 100 amperes or less installed in the following locations shall have ground-fault circuit-interrupter protection for personnel.

(9) Crawl spaces – at or below grade level

Comment:  The requirement for GFCI protection in crawl spaces has been expanded to also include non-dwelling units as well as dwelling units, since the same hazard exists in both locations. Also expanded are the voltage and current requirements of 210.8(B).