Electrical tape (or insulating tape) is a type of pressure-sensitive tape

used to insulate electrical wires and other material that conduct electricity.
 It can be made of many plastics, but vinyl is most popular, as it stretches
 well and gives an effective and long lasting insulation. Electrical tape for
class H insulation is made of fiberglass cloth.
  




A wide variety of electrical tapes is available; some for highly specialized purposes. Electricians generally use only black tape for insulation purposes. The other colours are used to indicate the voltage level and phase of the wire. (In fact, the coloured tape is referred to as "phasing tape".) This is done on large wire which is available only in black insulation. 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 following table describes this usage.

Tape colour	Usage (US)	Usage (UK – old)	Usage (International – new)
Black	Insulation Low voltage, phase A	Insulation Low voltage, neutral	Low voltage, phase B
Red	Low voltage, phase B	Low voltage, phase A	Sheath, 415 V 3 phase
Blue	Low voltage, phase C	Low voltage, phase C	Low voltage, neutral Sheath, 230 V
Brown	High voltage, phase A		Low voltage, phase A
Orange	High voltage, phase B		Sheath, garden tools
Yellow	High voltage, phase C	Low voltage, phase B	Sheath, 110 V site wiring
Green	Earth ground	Earth
Green with yellow stripe	Isolated ground		Earth
Grey	Low voltage, neutral High voltage, neutral		Low voltage, phase C
White	Low voltage, neutral High voltage, neutra