AC является маркой кабеля по системе NEC / UL (USA): AC = Armored cable, interlocked armour; 90 = Conductors rated 90 C (AC-90 / ACHH); AC = Armored cable (BX): insulated conductors with a bonding strip in interlocked steel armour, no outer jacket. 600 V, 90 C conductors (AC-90 / ACHH). UL 4; NEC Article 320.
Armored cable (BX): insulated conductors with a bonding strip in interlocked steel armour, no outer jacket. 600 V, 90 C conductors (AC-90 / ACHH). UL 4; NEC Article 320