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Residential
Structural Certifications
& Environmental Testing |
Cords and Plugs
Inspections
back to Residential Electrical Systems

The three basic kinds of plug are self-connecting,
terminal-screw, and three-prong. Lamps and small appliances most often use
self-connecting plugs, the prongs of which clamp onto the wires of the
cord, making an automatic connection.
With terminal-screw plugs, the wires attach to screws inside the cord
body; this type of plug is usually found on older appliances. An older
terminal-screw plug often has a removable insulating disk covering the
terminals and wires. Newer plugs have rigid insulating barriers.
Three-prong plugs are used for larger appliances such as washers, dryers,
refrigerators, and power tools, and include a prong that grounds the
appliance. When planning where you are going to place a large appliance,
be sure you have the appropriate kind of outlet available, or plan to
install one.