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For example, a 900-pair cable has the first 600 pairs in 24 groups of 25 pairs in a white binder, and the remaining 300 pairs in 12 groups of 25 pairs wrapped in a red binder. [ 5 ] [ 6 ] Some cables are "mirrored" or "clocked" with a pattern that is known throughout the telephone industry.
DIN Standard DIN 47100 regulated the color-coding for the identification of cores in telecommunication cables. The standard was withdrawn without a replacement in November 1998, but remains in widespread use by cable manufacturers.
Tiger tail cannot be fashioned into a knot in order to end a sequence of beads as other kinds of thread can, [5] therefore crimp beads are often used for this purpose instead. [6] Crimp beads are also used as spacers between other beads strung on tiger tail. [7] Among the types of wire used for bead stringing, tiger tail is the most common. [8]
The international standard IEC 60446 Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors was a standard published by the International Electrotechnical Commission (IEC) that defined basic safety principles for identifying electrical conductors by colours or numerals, for example in ...
Meter tails (or, tails) The single-core cables connected to the electricity meter. On the supply side these connect the meter to the line and neutral conductors of the supply cable, via the service head (or cut out) located on the end of the supply cable. On the consumer side these conductors are then joined to the distribution board, possibly ...
The cable connectors and sockets are keyed and colour-coded, according to the voltage range and frequency used; common colours for 50–60 Hz AC power are yellow for 100–130 volts, blue for 200–250 volts, and red for 380–480 volts. The blue fittings are often used for providing weather-proofed exterior sockets for outdoor apparatus.