There are standards for them, which describe their operation.
Only tested as a component in isolation of course - knowing that the voltage at the SPD is clamped to a kV or so tells you surprisingly little about what voltage will appear across the terminals of a socket even just a few metres away in any typical installation that includes all sorts of open ended branches, propagation delays and random changes of transmission line impedance at every joint. The sure fire way to protect an expensive appliance is to clamp the voltage at the point that appliance is connected or inside it.
Mike.
There are standards for them, which describe their operation.
Only tested as a component in isolation of course - knowing that the voltage at the SPD is clamped to a kV or so tells you surprisingly little about what voltage will appear across the terminals of a socket even just a few metres away in any typical installation that includes all sorts of open ended branches, propagation delays and random changes of transmission line impedance at every joint. The sure fire way to protect an expensive appliance is to clamp the voltage at the point that appliance is connected or inside it.
Mike.
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