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Consists of two insulated solid cores with a bare copper earth conductor between the inner cores and an overall PVC sheath. The colours being:
Pre March 2004 Post March 2004
Live Red Brown
Neutral Black Blue
Earth Green and Yellow (see note)
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.
core size mm2 current (A)
*see note wattage (kW)
at 240v
*see note typical applications
1.0 14 3.25 lighting
1.5 18 4.25 lighting
2.5 24 5.75 power circuit
4.0 32 7.75 power circuit, shower
6.0 40 9.75 shower, cooker
10 53 12.9 cooker
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:
Broken individual strands - this will reduce the current carrying capacity of the cable and can cause the wire to overheat at screw terminals.
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:
Pre March 2004 Post March 2004
Blue Grey
Yellow Black
Red Brown
Green and Yellow (see note)
Core size mm2 current (A)
*see note wattage (kW)
at 240v
*see note typical applications
1.0 12 2.75 lighting double pole switching
Armoured cable
Armoured cable is normally used to transfer power either underground or overhead. The construction is normally the inner cores (which are generally multi strand) being individually sheathed, then covered by an initial overall plastic sheath, followed by the protective wire armour with a final outer sheath to hold it all together. The inner cores may number two, three or four depending upon the application.
The wire protective armour should always be earthed at at the supply end to ensure that it cannot become live if the the cable is severed or a fault should develop within the cable.
Installation of armour cable should be left to professional contractors, not so much because it is difficult but because of the safety implications if overhead or underground installations should fail to meet the exacting installation requirements.
The ratings below are typical for three core armoured cable but individual manufacturers will give specific ratings for their own cables which should be used in preference to the following.
Core size mm2 current (A)
*see note wattage (kW)
at 240v
*see note
1.5 18 4.25
2.5 24 5.75
6.0 41 9.9
10.0 56 13.5
16.0 85 20.5
25.0 104 25.25
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