CABLE DUCT SEALS ➡ Failure to correctly and effectively seal cable ducts can inflict catastrophic damage to LV-HV electrical distribution networks, substations and power supply. Duct Sealing Products including cable transits to provide a watertight seal and defence against flood damage to low, medium and high voltage cable ducts with additional protection against harmful flammable gas migration and fire spread. Duct seals are installed by contractors to reinforce the flood defenses of MV-HV substations housing critical medium and high voltage power cables and electrical equipment, typically at medium voltage ( 11kV/33kV), high voltage (66kV-132kV) and transmission and distribution grid networks.