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 9 replies
  • Subscribers 31 subscribers
  • Views 1333 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Panel Isolators - Different Voltages?

Les Spiteri
Where different voltages are fed into a panel is it permitted to isolate them both through the same isolator?
  • For example where you have a Main Fused Isolator for an incoming 3ph supply and a 110Vdc incoming from a UPS?

  • My experience says that as you quite often get auxiliary isolation contacts then it is possible.

  • However should these auxiliary contacts only be used for signalling and therefore cannot be used as a mean of isolation?

  • Also I frequently see 3 or 4 pole isolator used for single phase supply so can you use the remaining contacts to isolate another voltage?


Any thoughts would be most welcome.
Parents
  • 0
    Agreed @broadgage - this is permitted in BS EN 60204-1, and a reason I also stated "many ELV supplies", not "all ELV supplies". BS EN 60204-1 requires different coloured conductor identification for circuits not under control of the panel isolator as another indication.


    I just thought it was worth highlighting that danger (and hence requirement for isolation) is not just an LV issue.
Reply
  • 0
    Agreed @broadgage - this is permitted in BS EN 60204-1, and a reason I also stated "many ELV supplies", not "all ELV supplies". BS EN 60204-1 requires different coloured conductor identification for circuits not under control of the panel isolator as another indication.


    I just thought it was worth highlighting that danger (and hence requirement for isolation) is not just an LV issue.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines