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SPD - cable selection

J P

Hi all, just out of curiosity, trying to establish if I’m completly

overthinking this. There is an existing type 1/2 SPD installed on a main mccb panel. It’s fed from a 63A mccb and is approx 30cm away and goes into a separate enclosure. 

the cable size is 10mm with a 16mm earth. Iv been wondering regarding the 63A mccb, but am I right in thinking it’s only there to provide short circuit protection rather than overload? 

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    In the new Hager single-phase consumer unit there is not any circuit protection for the SPD  and there are not any cables connecting the SPD.

    Line and neutral to the SPD are connected into the main switch using busbars and the SPD is earthed to the consumer unit metalwork though a metal clip pop riveted to the Din rail.

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  • 0

    In the new Hager single-phase consumer unit there is not any circuit protection for the SPD  and there are not any cables connecting the SPD.

    Line and neutral to the SPD are connected into the main switch using busbars and the SPD is earthed to the consumer unit metalwork though a metal clip pop riveted to the Din rail.

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