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1. GOST R MEK 61557-7-2009
Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring
of protective measures. Part 7. Phase sequence
ГОСТ Р МЭК 61557-7-2009
Сети электрические распределительные низковольтные напряжением до 1000 В переменного тока и 1500 В постоянного
тока. Электробезопасность. Аппаратура для испытания, измерения или контроля средств защиты. Часть 7. Порядок
следования фаз
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