Industrial Specification Grade duplex outlet featuring a molded nylon body. Isolated grounding path (indicated by orange triangle on face) separates the transient currents which can cause electronic equipment such as cash registers, computers and medical instruments to perform poorly. Feed-through and back wire through 8 deep-funneled wire wells. Double-wire copper power contacts for conductivity. Large-head deep-slotted terminal screws are backed out, staked, and spring backed. Use up to No. 10 copper wire. Break-off fins for 2-circuit wiring. UL (Underwriter's Laboratories) listed for use in hospitals (indicated by green dot on face). 20 amps/125volts, NEMA (National Electrical Manufacturer's Association) 5-20R. Limited 10-year warranty. Orange.