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| Subject | English | Russian |
| fire. | according to the first reliability category of power supply | электроснабжение по первой категории надёжности (vatnik) |
| energ.ind. | category of power supply reliability | категория надёжности электроснабжения (Principal Electrical Engineer Rafael K.) |
| energ.ind. | power supply reliability category | категория надёжности электроснабжения (Principal Electrical Engineer Rafael Kadyrmaev) |