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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.

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    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.

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  • 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.

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