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Hager Surge protector

goldenboy1818
Hi guys


Fitting a hager surge protector in a board and its all pre wired. Just wondered about something, it has a earth fly lead up to the main earth bar, but also another earth terminal on the bottom of the device.. is this needed ?? I havent fitted many as in the area where iam and small domestics we haven't needed to install them. Thanks guys
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    You can also use the second SPD Earth terminal to make a short connection to the nearby chassis - this provides a second path back the earth bar which, due to it being a flat sheet of steel, doesn't suffer from the same inductive effects that makes long leads from the SPD bad. (I don't pretend to understand the physics behind this - I'm just parroting the BEAMA advice).
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    You can also use the second SPD Earth terminal to make a short connection to the nearby chassis - this provides a second path back the earth bar which, due to it being a flat sheet of steel, doesn't suffer from the same inductive effects that makes long leads from the SPD bad. (I don't pretend to understand the physics behind this - I'm just parroting the BEAMA advice).
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