The ratio of the number of turns between windings in a transformer. Normally primary to secondary, except for current transformers where it is secondary to primary.

Another term for the device that collects the coils as they leave the production line (rolling or extruding). Often referred to as a spider.

Designation for: 1) thermoplastic insulated, vinyl-jacketed, moisture resistant building cable, 60°C (140°F) dry and wet locations. 2) For bare overhead, trapezoidal shaped wire.

Type of building wire used for general purpose at ratings up to 600 volts. It is designed to operate at temperatures up to 60°C (140°F) in wet and dry locations and is especially advantageous for rewiring as well as new installation. The wire is insulated with a PVC compound, designed to provide a tough wire that possesses excellent dielectric strength and is flame resistant. The smooth surface is treated with a silicone solution to ease pulling through conduit and ductwork.

Similar to Hollander Weave but with warp and weft wires of the same or similar size.

A type of weaving usually employed when making heavy gauge wire cloth of mesh so fine that the wire is as wide or wider than the average gap between the wires. In twill weaving the warp and waft wires go under or over two or more wires and the wires therefore do not have to be crimped round such a sharp radius.

Continuous casting operation where the molten material is poured through a die that consists of two belts moving in unison for the continuous release of the material after it is solidified.

A pair of insulated conductors twisted, sheathed or held together mechanically and not identifiable from each other in a common covering.

A single cable that consists of two separate coaxial cables laid adjacent and parallel or twisted together.

A type of transmission line that has a solid insulating material, in which the two conductors are placed parallel to each other and whose impedance is determined by the diameter and spacing of the conductors and the insulated material. Also known as twin lead.

A pair of insulated conductors of 9 AWG or smaller, twisted or bonded together and not identified from each other. Note: some wire insulations, such as telephone cables, have different colors to make it easier to locate each specific wire over long lengths.

This double-twist type of machine is used to twist or “twin” together two single wires or flexible cores. It is comprised of a counter-weighted cradle supported within a bow frame that can be rotated on trunnions around the cradle by a motor. It is this rotation that imparts the lay length in the product. The cradle is counter-weighted to prevent its rotation within the bow frame. The take-up reel, which is supported in the cradle, is free to rotate on its own axis and is driven by a independent motor. The relationship between the bow frame RPM and the take-up reel RPM sets the final lay in the product.

The main difference between a twinner and a buncher is that in most cases a twinner processes just two single wires or flexible cores that are supplied by motor-driven payoffs with a dancer control or a drag brake(s) and the take-up reel is the only means of setting the speed. Conversely, a buncher can process many wires from one or more reels or stem packs. The product speed is set by an internal capstan and the take-up reel is in torque mode.

Consists of twisting two insulated conductors together at high speed with the required length and direction of twist.

The rotation of a wire or cable around its axis.

Guide used to prevent twisting of the rod as it is moving from one rolling stand to another, particularly critical at high speeds.

See Torsion Test.

A cable composed of two small insulated conductors twisted together without a common covering. Two insulated conductors, twisted together and coded.

Any three individually insulated conductors that are twisted together.

Tube that has been twisted and has a symmetrical cross-section and nominally uniform wall thickness.