The information presented in this article will teach panel designers how the correct size of surge protection devices (SPDs) is determined so that the system’s surge protection will achieve that balance to be both complete and cost effective. SPDs reduce surge voltages to a level that the power distribution system and the connected equipment can handle. SPDs are primarily rated by how much of a surge current magnitude they can handle, and how well they limit the voltage when conducting that surge current.SPDs are not one-size-fits-all devices, nor do the size of their kA rating (the surge rating) go hand-in-hand with the size of the panel. In other words, you should not select an SPD with a maximum kA rating just because the panel is large.
Read the full article in the March issue of PBSI.
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