Wire connector
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This allows a single-conductor bare wire to be pushed through the hole, forming a "pigtail" section which can be attached to a grounding screw. Special feedthrough twist-on wire connectors differ from standard wire connectors in that they have an additional opening at the top of the insulated cap.
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Specific twist-on wire connectors containing a conductive, anti-oxidant gel are registered for use on residential aluminum wiring in Canada, including when new copper wiring is connected to existing aluminum wiring. In spite of this, several companies manufacture twist-on connectors, which they claim are designed and rated for use with aluminum conductors. The US Consumer Product Safety Commission disapproves wire nuts for aluminum wire instead, special crimp connectors are called for, and as of 2011 the CPSC asserted qualified, second-preference approval of a certain kind of screw terminal. Twist-on wire connectors are not generally recommended for use with aluminum wire in the USA. Special gel-filled connectors must be used in this circumstance. Ordinary twist-on connectors are not rated for wet use (such as exposed outdoors or buried underground). Instead, set screw connectors, clamps or crimp connectors are used.Ĭeramic twist-on connectors are made for high-temperature applications, such as heating appliances. Twist-on connectors are not often used on wire gauges thicker than AWG #10 (5.26 mm²), because such solid wires are too stiff to be reliably connected with this method.
#WIRE CONNECTOR INSTALL#
They are commonly used as an alternative to terminal blocks or the soldering of conductors together, since they are quicker to install and, unlike soldered or crimped connections, allow easy subsequent removal for future modifications. Twist-on wire connectors are commonly color-coded to indicate the connector size and, hence, their capacity.
#WIRE CONNECTOR DRIVER#
Such extensions also allow these connectors to be installed with a common nut driver or a specialized tool. Winglike extensions are commonly molded into higher quality connectors to reduce operator muscle fatigue when installing a large number of the connectors.
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They may have external grooves to make them easier to handle and apply. Twist-on wire connectors are typically installed by hand. Electrical continuity is maintained by both the direct twisted wire-to-wire contact and by contact with the metal insert. When such a connector is twisted onto the stripped ends of wires, the wires are drawn into the connector's metal insert and squeezed together inside it. While their exterior covering is typically made from insulating plastic, their means of connection is a tapered coiled metal insert, which threads onto the wires and holds them securely. Twist-on wire connectors are available in a variety of sizes and shapes.
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