EATON Cutler-Hammer Series Safety Switch, Heavy Duty Non-Fusible, Series: DH Series, 600 VAC, 30 A, 30 hp, 3 ph, 3 Pole, 3 Wires, TPST Contact Form, NEMA 3R Enclosure, Panel Mounting, 16.5 in L x 9.12 in W x 8.31 in H Dimensions, Steel, Galvanized/Painted. NEC Article 210.63 requires that a 125 V, 1-phase, 15 A or 20 A rated receptacle outlet be installed at an accessible location for the servicing of heating, air-conditioning and refrigeration equipment. The receptacle must be located on the same level and within 25 ft of the heating, air-conditioning and refrigeration equipment.heavy duty safety switch is an ideal solution for these applications, including elimination of the need for running a separate 120 V circuit to the rooftop.