The conductors shall be circular stranded or sector shaped copper stranded wires.
Identification of cores:
Single core - red or black
Two-core - red and black
Three-core - red, yellow and blue
Four-core - red, yellow, blue and black
Five-core and above - (number) 1, 2, 3, 4, 5.... (auxiliary cables), and the numbers shall
be blue or black printed on white cores.
Laying up (assembling):
The cores of cables having two or more cores shall be laid up to
form a compact and circular cable. Where necessary, non-hygroscopic fillers may be
Extruded black PVC Compound or lapped PVC tapes.
The armour shall consists of a single layer of galvanised steel wires.
Where single-core cables are armoured with non-magnetic material, such as aluminium wire.
Black PVC compound type ST1.