CURRENT RATINGS FOR COPPER CONDUCTOR PVC, BUTYL, ETHYLENE PROPYLENE AND SILICONE RUBBER INSULATED CABLES (SUBJECT TO VOLTAGE DROP) The current ratings tabulated below are based on an ambient temperature of 30°C
A = pvc insulated non-armoured cable B = butyl, e.p. and silicone rubber insulated non-metal sheathed cables
Size of conductor
| Cables bunched and enclosed in conduit or trunking
| Nominal cross-sectional area
| Number and diameter of wires
| 2 single-core dc or one-phase ac
| 3 single-core
or 4 single-core 3 phase ac
| 1 twin-core dc or one-phase ac
| 1-3 core or 1-4 core 3-phase ac
| | | | | | | | | | | | | | | | | | | 续。。 |