Tough Rubber Sheath (TRS)
In the US this is obsolete wiring, circa 1949-1969. TRS is in current use in the UK where greater mechanical toughness is required than PVC provides.
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прочная резиновая оболочка — — [Я.Н.Лугинский, М.С.Фези Жилинская, Ю.С.Кабиров. Англо русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.] Тематики электротехника, основные понятия EN tough rubber sheathTRS … Справочник технического переводчика
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