Ring Main Cable Rating
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Floor area for a ring main or final ring circuit.
Ring main cable rating. The floor area a ring main serves is also governed. Ring main and spurs. The cable size is important it has to be either 2 5sq mm or 4 0sq mm twin core and earth these are rated in free air at 24amps or 32amps respectively. In another book electrical installations 2330 level 2 it confirms the above but it says a minimum size of the conductor is 1 5mm for a fused spur i assume you can t go lower than.
Rules for ring circuits provide that the cable rating must be no less than two thirds of the rating of the protective device. The diagram in the red book coming off the main ring is an fcu with a cable size of 2 5mm but coming off the fcu to a spurred socket is a 1 5mm cable fair enough. Cleveland cable company cable calculator. In most domestic situations the cable size used for sockets on a ring main or radial main is 2 5mm twin and earth cable.
Each ring circuit is protected by a 32 amp fuse or trip fitted in the consumer unit. Cookies are tiny text files stored on your device that allow data states to be tracked as you browse around a site. This is because the regulation people have some idea of how much power and lighting we can expect to use in such an area. They are essential to functionality such as shopping baskets user logins preferences recently viewed pages or items or previously filled form elements.
Given 2 5mm twin and earth clipped direct is 27 amps times two for parallel is 54 amps for a clipped direct ring. 2 5mm electrical cable with neutral wire live wire and bare earth wire. 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 maximum area for a ring main is 100 square meters.
This means that the risk of sustained overloading of the cable can be considered minimal.
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