Electrical supplies are crucial components in the Tools & Hardware category, encompassing products with varying voltage and amperage ratings; when selecting, consider aspects like wire gauge, connector types, and safety features for a reliable and secure installation.One standard electrical outlet contains a 120-volt wire and a neutral wire which deliver power using one phase of your electrical service. 240-volt outlets use two 120-volt wires simultaneously, plus a neutral wire to power a single receptacle. Older homes and appliances may use three-prong 240-volt outlets.