Ring Main Cable Size
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A ring main uses 2 5mm cable comprising of a live neutral and earth.
Ring main cable size. In most domestic situations the cable size used for sockets on a ring main or radial main is 2 5mm twin and earth cable. Its simplicity makes it a great arrangement for that use. The cable of the ring circuit consists of a brown live wire a blue neutral wire and a bare copper earth wire all three being enclosed by an outer pvc sheathing. The size of cable used for sockets needs to be larger than that used for lighting circuits because that it will have to cope with more load due to the number of different appliances with different power supply needs that could potentially be plugged in.
The cable used in domestic ring circuits is either 2 5sq mm or 4 0sq mm twin core and earth these are rated in free air at 24amps or 32amps respectively. An example of this cable type can be seen below and shows the live neutral and earth wires. The main purpose of a spur is adding an extra socket on to an existing ring main circuit. The 2 5mm is the measurement of the cross sectional area of the cables.
To determine the appropriate size of circuit breaker for single phase supply it depends on multiple factors like type of load cable material and environment temperature etc. This is called two core and earth cable. Sometimes 4 mm 2 cable is used if very long cable runs to help reduce voltage drop or derating factors such as very thick thermal insulation are involved. Design and protection for ring main circuits.
Ring mains as they are called are a series of cables linked together starting and terminating at the same point in a distribution board. The general rule of thumb is that circuit breaker size should be 125 of the ampacity of cable and wire or the circuit which has to be protected by the cb.
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