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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="Phoenix" data-source="post: 222039" data-attributes="member: 8133"><p>The 1.5mm will fail the adiabatic on on let through of 100A fuses, so no fault protection so does not comply. If you had 6mm tapped off main switch to fused spur adajacent board and then 1.5mm from there onwards, you'd probably be able to make that comply IMHO.</p><p></p><p>Sidewinder: Seen 2.5mm singles off a 450A protected busbar and then along in switchroom trunking to a 15A cartridge fuse fire alarm switchfuse. Seem to remember calculating the adibatic using let through from the upstream MCCB manufacturers data and finding that 16mm was the smallest size which was protected against faults (plus being a lot bigger, much more unlikely to get caught in trunking lid). Same factory also had a second building that had a fire alarm 1.5mm circuit straight off a 50A breaker though, due to someone at some point running out of ways on the dist board and dobbing it in with a submain</p></blockquote><p></p>
[QUOTE="Phoenix, post: 222039, member: 8133"] The 1.5mm will fail the adiabatic on on let through of 100A fuses, so no fault protection so does not comply. If you had 6mm tapped off main switch to fused spur adajacent board and then 1.5mm from there onwards, you'd probably be able to make that comply IMHO. Sidewinder: Seen 2.5mm singles off a 450A protected busbar and then along in switchroom trunking to a 15A cartridge fuse fire alarm switchfuse. Seem to remember calculating the adibatic using let through from the upstream MCCB manufacturers data and finding that 16mm was the smallest size which was protected against faults (plus being a lot bigger, much more unlikely to get caught in trunking lid). Same factory also had a second building that had a fire alarm 1.5mm circuit straight off a 50A breaker though, due to someone at some point running out of ways on the dist board and dobbing it in with a submain [/QUOTE]
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The correct method of connectng a feed to a fire alarm panel.
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