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INSTALLATION ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heater. Failure to do so could result in personal injury or property damage. Heater must be installed by a qualified person in accordance with the National Electrical Code, NFPA 70. High heating efficiency, low sheath temperatures and long heater life result when electric heaters are properly installed. INSTALLATION – CLAMP-ON 1. Clamp strip heaters securely, along their entire length, to smooth metal surface