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Self-Regulating Heating Cable 220V Exe T4 ATEX Explosion Proof Heat Trace Cable for Pipeline Antifreeze & Roof Snow Melting, 25W/M~75W/M. Adopts PTC polymer core, automatically adjusts power output with temperature change. Built-in overheat protection, safe even with overlapping installation. Cut-to-length on site for easy installation. Flame-retardant, explosion-proof & corrosion-resistant jackets optional for harsh working conditions. Direct manufacturer, custom specifications available. Used for pipeline freeze protection & temperature maintenance in oil & gas, chemical, fire protection industries.