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絕緣電阻是電氣設(shè)備和電氣線路最基本的絕緣指標(biāo)。對于低壓電氣裝置的交接試驗(yàn)，常溫下電動機(jī)、配電設(shè)備和配電線路的絕緣電阻不應(yīng)低于0.5MΩ(對于運(yùn)行中的設(shè)備和線路，絕緣電阻不應(yīng)低于1MΩ/kV)。低壓電器及其連接電纜和二次回路的絕緣電阻一般不應(yīng)低于1MΩ；在比較潮濕的環(huán)境不應(yīng)低于0.5MΩ；二次回路小母線的絕緣電阻不應(yīng)低于10MΩ。I類手持電動工具的絕緣電阻不應(yīng)低于2MΩ。加直流電壓于電介質(zhì)，經(jīng)過一定時(shí)間極化過程結(jié)束后，流過電介質(zhì)的泄漏電流對應(yīng)的電阻稱絕緣電阻。
