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Wylex REC2SPD

Will Elec
Hi all,


I bought one of these for the first time today for a job I have coming up. I was suprised when I opened it up to find the SPD linked to the isolator by just 2.5mm wires, as these are the factory connection I guess this is the norm but I was suprised all the same! Why so small? I was expecting a copper busbar!


Thanks,

Will
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    When operating normally, SPDs only handle brief transients - the sort you get from e.g. a lighting strike near the distibution network somewhere. So although a significant current may flow through the SPD, the total energy passed is small and the cable won't overheat. If the transient is too long, the fusible element built into the SPD will open, again before the wire has overheated. Finally, the fact the OCPD in the SPD is after the cable is probably covered by [433.2.2] and/or [434.2.1]


    (All the above is speculation on my part.)
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  • 0
    When operating normally, SPDs only handle brief transients - the sort you get from e.g. a lighting strike near the distibution network somewhere. So although a significant current may flow through the SPD, the total energy passed is small and the cable won't overheat. If the transient is too long, the fusible element built into the SPD will open, again before the wire has overheated. Finally, the fact the OCPD in the SPD is after the cable is probably covered by [433.2.2] and/or [434.2.1]


    (All the above is speculation on my part.)
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