Description[ edit ] The wire may be wrapped directly under the head of a screw, may be held by a metal plate forced against the wire by a screw, or may be held by what is, in effect, a set screw in the side of a metal tube. The wire may be directly stripped of insulation and inserted under the head of a screw or into the terminal. Otherwise, it may be either inserted first into a ferrule , which is then inserted into the terminal, or else attached to a connecting lug. Depending on the design, a flat-blade screwdriver , a cross-blade screwdriver, hex key , Torx key, or other tool may be required to properly tighten the connection for reliable operation. Applications[ edit ] Screw terminals are used extensively in building wiring for the distribution of electricity - connecting electrical outlets , luminaires and switches to the mains , and for directly connecting major appliances such as clothes dryers and ovens drawing in excess of 15 amperes. Screw terminals are commonly used to connect a chassis ground , such as on a record player or surge protector.
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