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Explanation: credo anche in campo elettrico, vedi
Clause 311 - Industrial plugs and socket-outlets for powering machines and apparatus rated at more than 1000 Watt must have an upstream switch and fuses, excluding the neutral, in such a way as to permit the insertion of the plug into the non-energised socket." http://www.marechal.com/En/sc_8/f_b/sc8_fb_6.html