The authors have investigated the coordination between the SPD in a panel-board and the SPD components of an electric household appliance. Study results clarified the following items. Installing a SPD in a panel-board can reduce the capacity of SPDC (surge protective device components) in an electric household appliance. The SPD in a panel-board is better to be grounded at the panel-board side for the flow of surge current, than at appliance side. When it is grounded at the electrical household appliances side, the surge current value of SPD and SPDC is decided by the operating voltage of MOV (SPD and SPDC).
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