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S.P.D.s and Populated Consumer Units.

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Are new populated consumer units with S.P.D.s fitted designed to mainly protect the sensitive electronic equipment downstream of the S.P.D.s WITHIN THE CONSUMER UNIT? Is that the makers' MAIN intention as R.C.D.s, R.C.B.Os and other sensitive electronic devices can be damaged by Voltage surges, as compared to basic protective devices like wire or cartridge fuses or more basic M.C.B.s?

https://www.youtube.com/watch?v=5OuirPKoY0c


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    whjohnson:

    It might help if these things actually worked! I know this is a AFD rather than a SPD but the jury is still out as far as I am concerned. Here's part 1. Parts 2 & 3 are as equally illuminating.




    I don't think its fair to compare SPDs and AFDDs. SPDs are conceptually simple: if the voltage exceeds some limit, apply a short using e.g. a hefty thyristor. AFDDs have to monitor HF patterns in the current and subjectively decide which ones are normal (power-on switch spark, sparky brushes on a motor, electronic dimming etc) and which ones are a heat-generating arc fault. Which is hard to get right.

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    whjohnson:

    It might help if these things actually worked! I know this is a AFD rather than a SPD but the jury is still out as far as I am concerned. Here's part 1. Parts 2 & 3 are as equally illuminating.




    I don't think its fair to compare SPDs and AFDDs. SPDs are conceptually simple: if the voltage exceeds some limit, apply a short using e.g. a hefty thyristor. AFDDs have to monitor HF patterns in the current and subjectively decide which ones are normal (power-on switch spark, sparky brushes on a motor, electronic dimming etc) and which ones are a heat-generating arc fault. Which is hard to get right.

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