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 52 replies
  • Subscribers 30 subscribers
  • Views 10971 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

Extra Low Voltage (ELV)

Former Community Member
Former Community Member
Guys,


BS7671:2018 is classing cables extra low voltage (ELV) as an operating voltage not exceeding 50Vac or 120V ripple-free dc.


BS7671 goes on to further categorize ELV cables into SELV, PELV, FELV.


For single core green/yellow insulated equipotential bonding cables lets say originating from an earth bar and bonding some structural steel work, are these classed as FELV under BS7671:2018 ?
Parents
  • 0

    Mike M:



    I am not sure you have grasped my question. SELV,PELV,FELV are already very well defined in BS7671:2018. My question was BS7671:2018 is classing cables extra low voltage (ELV) as an operating voltage not exceeding 50Vac or 120V ripple-free dc, For single core green/yellow insulated equipotential bonding cables lets say originating from an earth bar and bonding some structural steel work, are these classed as FELV under BS7671:2018 ?


    If you read BS7671:2018 you will see that FELV does not need to meet the isolation requirements imposed on SELV and PELV.


     




    I think we've already answered this - they are generally classed as Low Voltage for an LV installation. When connected in an installation complying with BS 7671 and relevant legislation, they are generally considered safe to touch (give or take the debate around broken PME Neutrals).

Reply
  • 0

    Mike M:



    I am not sure you have grasped my question. SELV,PELV,FELV are already very well defined in BS7671:2018. My question was BS7671:2018 is classing cables extra low voltage (ELV) as an operating voltage not exceeding 50Vac or 120V ripple-free dc, For single core green/yellow insulated equipotential bonding cables lets say originating from an earth bar and bonding some structural steel work, are these classed as FELV under BS7671:2018 ?


    If you read BS7671:2018 you will see that FELV does not need to meet the isolation requirements imposed on SELV and PELV.


     




    I think we've already answered this - they are generally classed as Low Voltage for an LV installation. When connected in an installation complying with BS 7671 and relevant legislation, they are generally considered safe to touch (give or take the debate around broken PME Neutrals).

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