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This Standard specifies portable insulation resistance testers of built-in battery type, having a rated output voltage not exceeding 1 000 V, which are used for the measurements of the following a) to e): a) Insulation measurement of low voltage distribution path: The insulation measurement of paths and devices which are powered off in a distribution system up to 1 000 V a.c. and 1 500 V d.c.; b) Insulation measurement of device, appliance, component, etc. (The photovoltaic array not in power generating state corresponds to an appliance or a component.); c) Insulation measurement of high-voltage equipment; d) Insulation measurement of photovoltaic array in power generating state by short-circuiting P-N terminals; e) Insulation measurement of photovoltaic array in power generating state without short-circuiting P-N terminals.