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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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    Assuming SPD is surge protection device.. when it finally fails, and goes dead short - what is the item that will open to save the whole supply from going off ? That is the rating those cables need to match.  If the SPD is internally fused at say 50A then that would be a good place to start. If it is not then I'd not expect a direct bus connection, rather connection via a fuse or similar,
    M.

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    Assuming SPD is surge protection device.. when it finally fails, and goes dead short - what is the item that will open to save the whole supply from going off ? That is the rating those cables need to match.  If the SPD is internally fused at say 50A then that would be a good place to start. If it is not then I'd not expect a direct bus connection, rather connection via a fuse or similar,
    M.

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