Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 11 replies
  • Subscribers 32 subscribers
  • Views 841 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Fire Alarm Panel Electrical Isolation.

Zoomup
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.
Parents
  • Former Community Member
    0 Former Community Member
    AJJewsbury:
    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.


    I'd agree with your thoughts Andy, bs7671 would be the fallback standard in the case of fire alarm systems. I would also say as a caveat that anything above and beyond the recommendations within a standard I'd also acceptable. 

    Regards Ts


Reply
  • Former Community Member
    0 Former Community Member
    AJJewsbury:
    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.


    I'd agree with your thoughts Andy, bs7671 would be the fallback standard in the case of fire alarm systems. I would also say as a caveat that anything above and beyond the recommendations within a standard I'd also acceptable. 

    Regards Ts


Children
No Data

Community Rules & Guidelines