![]() Please check with your local code enforcement authority. and Canada, different color codes are used for grounded (earthed) and ungrounded systems. Colors used may adhere to International Standard IEC 60446, older standards, or to no standard at all, and may vary even within a single installation. These were standardized to 7 mil (180 µm) and 10 mil (250 µm) in 1948.Conductors of a three-phase system are usually identified by a color code, to allow for balanced loading and to assure the correct phase rotation for induction motors. Black became the standard industry color for vinyl standard tape, primarily because of its ultraviolet resistance. White tape, because of its instability in ultraviolet light, was eventually replaced with black tape, although colored vinyl tapes are still used as identification and marking tapes. There is also electrically conducting tape for shielding and similar applications. Some of the most popular types include electrically insulating adhesive tape and electrically insulating film, both of which provide reliable electronic isolation and ensure that direct electrical connection is not made between two or more circuits or their adjacent parts. Electrically insulating tapes are essential for enhancing functionality and reliability in a wide range of applications. Tapes formulated for high-temperature were yellow, and later versions were white. This original electrical tape wasn't black. ![]() The first commercially available version of the tape was sold for use as a wire-harness wrapping. ![]() Finally, in January 1946, inventors Snell, Oace, and Eastwold of 3M applied for a patent for a vinyl electrical tape with a plasticizer system and non-sulfur-based rubber adhesive that were compatible. Research chemists and engineers at 3M set out to create a dependable, pressure-sensitive tape made of vinyl film that would have the required electrical, physical and chemical properties.Įxperiments were conducted combining new plasticizers with the white, flour-like vinyl resin. Unfortunately, TCP tended to migrate, giving the surface of the vinyl film an oily quality and degrading every tape adhesive known. A major ingredient in vinyl film was tricresyl phosphate (TCP), which was used as a plasticizer. In the early 1940s, vinyl plastic emerged as a versatile material for a wide range of applications, from shower curtains to cable insulation. Because of this, no matter how it was used it stuck to itself very readily. It was commonly referred to as "friction tape", and had the unique property of being sticky on both sides. This type of tape was often used to insulate soldered splices on knob and tube wiring. The original electrical insulating tape was made of cloth tape impregnated with Chatterton's compound, an adhesive material manufactured using Gutta-percha. Today, electrical tape is simply "another form of insulation". Tape that is approved for electrical applications will carry an approval label from an agency such as Underwriters Laboratories. The following table(s) describe the use of electrical tape.Įlectrical Tape Color Codes Tape color When wires are phased, a ring of tape is placed on each end near the termination so that the purpose of the wire is obvious. "The primary tapes used in electrical applications are vinyl, rubber, mastic, and varnished cambric." Electricians may use various colors of tape to insulate wire and to indicate the voltage level and phase of the wire (colored tape sometimes is called "phasing tape"). Varieties A selection of color-coded electrical tapes.Ī wide variety of electrical tapes is available, some for highly specialized purposes. Electrical tape for class H insulation is made of fiberglass cloth. It can be made of many plastics, but PVC (polyvinyl chloride, "vinyl") is most popular, as it stretches well and gives an effective and long lasting insulation. Adhesive electrical insulation Electrical tape, standard blackĮlectrical tape (or insulating tape) is a type of pressure-sensitive tape used to insulate electrical wires and other materials that conduct electricity.
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