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Do-It-Yourself (DIY) Question & Answer Forum
The correct method of connectng a feed to a fire alarm panel.
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<blockquote data-quote="Revved Up Sparky" data-source="post: 221923" data-attributes="member: 5050"><p>Yesterday I replaced a three phase (submain feeder) distribution board at a primary school. The feed (about a 2 metre run) to the fire alarm panel was taken off the supply side of the main switch of the old distribution board and was wired in 1.5mm FP cable.</p><p></p><p>I have seen certain 'essential services' such as fire alarm panels wired in this way before and I can understand why it has been done this way, for example if a circuit breaker - say a 6A MCB tripped off when nobody was in the building then the batteries could run down in the panel and there would be no fire alarm protection.</p><p></p><p>BUT, surely this practice is'nt right because that length of 1.5mm cable is protected by a 100A fuse. If a fault did develop in the piece of cable then the cable, designed to carry no more than about 10A could be carrying 100A of fault current and possibly catch fire !.</p><p></p><p>I personally think it would be safer to protect the circuit with a 6A MCB and ensure that this MCB is very clearly marked as the fire alarm circuit.</p><p></p><p>Does anybody have any thoughts on this ? Any input gratefully received.</p><p></p><p>Simon</p></blockquote><p></p>
[QUOTE="Revved Up Sparky, post: 221923, member: 5050"] Yesterday I replaced a three phase (submain feeder) distribution board at a primary school. The feed (about a 2 metre run) to the fire alarm panel was taken off the supply side of the main switch of the old distribution board and was wired in 1.5mm FP cable. I have seen certain 'essential services' such as fire alarm panels wired in this way before and I can understand why it has been done this way, for example if a circuit breaker - say a 6A MCB tripped off when nobody was in the building then the batteries could run down in the panel and there would be no fire alarm protection. BUT, surely this practice is'nt right because that length of 1.5mm cable is protected by a 100A fuse. If a fault did develop in the piece of cable then the cable, designed to carry no more than about 10A could be carrying 100A of fault current and possibly catch fire !. I personally think it would be safer to protect the circuit with a 6A MCB and ensure that this MCB is very clearly marked as the fire alarm circuit. Does anybody have any thoughts on this ? Any input gratefully received. Simon [/QUOTE]
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The correct method of connectng a feed to a fire alarm panel.
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