![]() ![]() After settling in the Toronto area, he was employed as an electrician contractor for Ontario Hydro, converting gas-lit homes to electrical incandescent lighting.Īt that time, the accepted practice for joining conductors was a process called “solder and tape”. Marr emigrated from Scotland to Ontario, Canada early in the twentieth century. If colored green, the assembly is intended to be used as a grounding pigtail, similar to the feedthrough twist-on wire connectors without a permanently-attached wire. If colored white, it typically may be used for splicing neutral wires in a device box, while leaving a pigtail free for connection to a device (such as a receptacle). The pigtail may be unterminated, or it may end in a preinstalled spade lug. ![]() These feedthrough connectors are typically green, and are also called "screw-on grounding connectors".Īnother specialized connector version has a permanently attached wire pigtail protruding from the top of the insulated cap. 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. ![]() 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. 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. Ordinary twist-on connectors are not rated for wet use (such as exposed outdoors or buried underground). Set screw connectors, clamps or crimp connectors are used instead.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. They are commonly used as an alternative to terminal blocks or soldering of conductors, 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. 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. 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 both by 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. One trade name for such connectors, Marrette, is derived from the name of their inventor ( see History) and, in Canada, this type of connector is often referred to as a marrette regardless of the actual brand of the product. Twist-on connectors are also known as wire nuts, wire connectors, cone connectors, or thimble connectors. They are widely used in North America and several European countries in residential, commercial and industrial building power wiring, but have been banned in some other jurisdictions. Twist-on wire connectors are a type of electrical connector used to fasten two or more low-voltage (or extra-low-voltage) electrical conductors. JSTOR ( January 2020) ( Learn how and when to remove this template message)Įnd view showing metal inserts Twist-on connectors used in a junction box Twist-on wire connectors.Please improve this article by adding secondary or tertiary sources.įind sources: "Twist-on wire connector" – news This article relies excessively on references to primary sources. ![]()
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