The number of damages of home electric appliances due to lightning surges have recently increased. Instllation of SPDs (Surge Protective Device) in interior wireing is one of countermeasures against the damages and is also spreading after an amendment of the regulation on indoor wires in 2005. Past study showed effective mthod, the earth line of SPD is connected with that of home appliances and is grounded at one place at home. However, because the institution ways of the distribution line at each home are various, it is difficult to estimate the effect of SPD at every home, and the high-precision analysis by EMTP for interior wiring and SPD at home is required. In this study, experiments were conducted with interior wiring and varisters which constitues SPD, and this paper report the results by those experiments and EMTP analytical models.
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