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
  • Replies 3 replies
  • Subscribers 32 subscribers
  • Views 276 views
  • Users 0 members are here
Options
You may also be interested in

SPD Supply Cables

Elliot0114

Hi, when selecting cables to run to an SPD from a busbar should they be rated to the upstream protective device?

I'm just looking at a design for a 315A DNO with limited space and it seems overkill to install 95mm Tri-Rated cables to the SPD protective device as it will need lugs to terminate the cables into it, especially when space is at a premium.

Parents
  • 0

    when selecting cables to run to an SPD from a busbar should they be rated to the upstream protective device?

    I'd say, applying general rules, yes; but since the SPD is a negligible load and unlikely to create an overload  you'd only have to provide fault protection, rather than overload - which usually means substantially smaller conductors will be acceptable (like a 1.5mm² c.p.c. on a 32A ring).

       - Andy.

Reply
  • 0

    when selecting cables to run to an SPD from a busbar should they be rated to the upstream protective device?

    I'd say, applying general rules, yes; but since the SPD is a negligible load and unlikely to create an overload  you'd only have to provide fault protection, rather than overload - which usually means substantially smaller conductors will be acceptable (like a 1.5mm² c.p.c. on a 32A ring).

       - Andy.

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