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Do-It-Yourself (DIY) Question & Answer Forum
Ring main question?
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<blockquote data-quote="boltonsparky" data-source="post: 71120" data-attributes="member: 4678"><p>Another point with ring mains is that you can spur off them, but only with 1 point without a switch fused spur. If the spur is a double socket the potential load is 26amps, maximum current carrying capacity of 2.5mm cable is 27amps without derating factors. With derating factors the cable could be overloaded.</p><p></p><p>Is this why some of you are talking about rings wired in 4mm cable?</p><p></p><p>Never come across a ring main wired in anything bigger than 2.5mm. Heard of the 4mm 32amp radial socket circuits though.</p></blockquote><p></p>
[QUOTE="boltonsparky, post: 71120, member: 4678"] Another point with ring mains is that you can spur off them, but only with 1 point without a switch fused spur. If the spur is a double socket the potential load is 26amps, maximum current carrying capacity of 2.5mm cable is 27amps without derating factors. With derating factors the cable could be overloaded. Is this why some of you are talking about rings wired in 4mm cable? Never come across a ring main wired in anything bigger than 2.5mm. Heard of the 4mm 32amp radial socket circuits though. [/QUOTE]
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