Electrical tape is used to insulate wires or other items that conduct electricity. Also known as insulation tape or electrical insulation tape, it is self-adhesive and pressure-sensitive, built to resist abrasion, heat and liquids in order to protect the sensitive conducting core within electrical wiring.
It is also made from different materials, including PVC, vinyl, copper foil and glass cloth. Different varieties feature varying colours, widths, thicknesses, temperature tolerance, adhesion strength and insulating capabilities.
The colours help electricians select the correct type and also enable them to colour code the wires they are working with.
Black tape is the most widely used colour - for general insulation and in order to indicate the low voltage neutral point in a circuit. Meanwhile, in the UK green and yellow tape typically indicate the protective earthing point. Blue tape is usually used to colour code low voltage neutral wires and red marks low voltage AC wires.