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 the client was the wife of a eye surgeon & had they been that destitute I would have gifted them 4 extra lamps.This article relies excessively on references to primary sources. Most of my folks added their initials to the date. installed - with magic marker - on every lamp we installed. Also, after one of my residential clients called (less than 24 hrs after a new 4 lamp fixture w/ 4 new lamps, all same brand) to complain of only 1 lit lamp and the arriving Journeyman found 4 lamps of 3 different brands, all with black ends, we all started marking the mo. 'tis a lot easier & less expensive to replace lamps than ballasts. Sure the client ate a second (at the time $1.84) 4' lamp - BUT 1 new & 1 old T-12's stressed out the ballasts & caused premature ballast failure. As an aside, until the electronic ballasts debut, I always had my people replace lamps in pairs (regardless if only one was dark). Needless to say, I sadly felt the need to let the re-use guy go. Not a single nut fell off in the 2000+ fixtures where the guys used new. call outs I found these re-used nuts rolling around inside the fixtures. One of my guys decided to re-use nuts (thinking to increase my bottom line). Power leads were replaced with Tan, (BTW, I had the crew replace ALL wire nuts with new to alleviate the chance of call backs as working over the lanes required care. When doing a switch to electronic ballasts in 6 Bowling Alleys and 1 Office bld'g I did utilize a bunch of the Orange ones. The Tan (having a broader range of conductor size they can accommodate) are my preference.
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