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Fire Alarm Panel Electrical Isolation.

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Is single pole electrical isolation suggested here even if we are going to prod and poke about inside the fire alarm panel? And, what are the two fuses removed mentioned all about? Is the lecturer confused?


Please see 41.12 onwards.

https://www.bing.com/videos/search?q=youtube+bs+5839+part+1&&view=detail&mid=92E9069FDA874942E42A92E9069FDA874942E42A&rvsmid=7BBC139314220094A9417BBC139314220094A941&FORM=VDQVAP


Z.
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    Well had a look at bs5839:1:2017 and it seems that the mention of a double pole isolator has indeed disappeared!

    Which presumably stops it contradicting BS 7671 - where generally N doesn't need isolating on TN systems.


    I'd guess that where BS 5839 doesn't override something then normal BS 7671 rules would apply to the supply - so you'd still need DP isolation on a TT system.


       - Andy.
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  • 0
    Well had a look at bs5839:1:2017 and it seems that the mention of a double pole isolator has indeed disappeared!

    Which presumably stops it contradicting BS 7671 - where generally N doesn't need isolating on TN systems.


    I'd guess that where BS 5839 doesn't override something then normal BS 7671 rules would apply to the supply - so you'd still need DP isolation on a TT system.


       - Andy.
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