AIR-TIGHT LEAD-IN Russian patent published in 1995 - IPC

FIELD: electrical engineering, electrical power engineering. SUBSTANCE: air-tight lead-in of supply cables into tight rooms or volumes has metal case with flanges attached to its ends and biological protection housed in it. Conductors with mineral insulation in metal sheath resistively coupled to case flanges are let through flange holes for connection with conductors of shielded supply cables. Novelty of invention lies in electrical interconnection of shields of supply cables with conductor coupled to at least one conductor of air-tight lead-in at distance satisfying condition l≅ 0,1/L EFFECT: enhanced reliability and safety of connection. 1 dwg