100m per roll 2 core 1.0mm Twin And Earth 6242Y

(general internal power cables)

Consists of two insulated solid cores with a bare copper earth conductor between the inner cores and an overall PVC sheath. The colours being:

Note: the earth feed is normally bare copper in mains installation cable, the Green and Yellow applies to the coloured sleeving which needs to be fitted where the earth is connected to a fitting or appliance.

Note: The currents and wattages shown are for the cables in 'free air' installations, the cables should be derated if cables are run together or in such a way that the thermal rise of the cable is not free to dissipate.

Types of cables that may be found in older premises.

Rubber insulated, two core (multi strand) covered with an outer lead sheath. If there is any of this very old wiring still installed, it should be isolated and replaced immediately. With the age of this type of cable, it is almost guaranteed that the rubber insulation will be degraded and breaking down, any failure of the insulation can cause the outer covering to become live - an installation still using this type of wiring is unlikely to have modern trips fitted in the consumer unit or a master earth leakage trip.

Rubber insulated, two or three core (multi strand) covered with an outer rubber sheath. The danger with this type of cables is the degrading of the rubber especially where a terminal has become overheated. The wiring should be considered ready for replacement.

PVC insulated, three core (multi strand) covered with an outer PVC sheath, this may still be in good physical condition. Two points to watch for are:

1. Broken individual strands - this will reduce the current carrying capacity of the cable and can cause the wire to overheat at screw terminals.
2. Earth wires which are just twisted together - this is not a function of the cable but the method of installation common at the time this type of cable was available.

3-core and earth

(normally used for the connections between two way switches)

Consists of three insulated solid cores with a bare copper earth conductor between the inner cores and an overall PVC sheath. The colour codes are: