drawings show power supply to heat tracing. If not required for HVAC piping, tracing may still be required for walk-in freezer, Section 11 41 21, WALK-IN COOLERS AND FREEZERS. //ELECTRICAL HEAT TRACING SYSTEMS Systems shall meet requirements of NFPA 70. Provide tracing for outdoor piping subject to freezing temperatures below 3.3 degrees C (38 degrees F) as follows: //Condenser water piping for cooling towers.// //Make-up water.// //Chilled water// //Hot water// piping at units // // and all other areas exposed to the weather.// //Domestic water lines exposed to weather.// Heat tracing shall be provided to the extent shown on the drawings (Floor plans and Elevations). Heat tracing shall extend below grade to below the defined frost line. Heating Cable: Flexible, parallel circuit construction consisting of a continuous self-limiting resistance, conductive inner core material between two parallel copper bus wires, designed for cut-to-length at the job site and for wrapping around valves and complex fittings. shall prevent overheating and burnouts even where the cable overlaps itself. Provide end seals at ends of circuits. Wire at the ends of the circuits is not to be tied together. Provide sufficient cable, as recommended by the manufacturer, to keep the pipe surface at 2.2 degrees C (36 degrees F) minimum during winter outdoor design temperature, but not less than the following: 75 mm (3 inch) pipe and smaller with 25 mm (1 inch) thick insulation: 4 watts per foot of pipe. 100 mm (4 inch) pipe and larger 40 mm (1-1/2 inch) thick insulation: 8 watts per feet of pipe. SPEC WRITER NOTE: Coordinate the need for emergency power with project drawings (electric discipline). Electrical Heating Tracing Accessories: Power supply connection fitting and stainless-steel mounting brackets. Provide stainless steel worm gear clamp to fasten bracket to pipe.
drawings show power supply to heat tracing. If not required for HVAC piping, tracing may still be required for walk-in freezer, Section 11 41 21, WALK-IN COOLERS AND FREEZERS. //ELECTRICAL HEAT TRACING SYSTEMS Systems shall meet requirements of NFPA 70. Provide tracing for outdoor piping subject to freezing temperatures below 3.3 degrees C (38 degrees F) as follows: //Condenser water piping for cooling towers.// //Make-up water.// //Chilled water// //Hot water// piping at units // // and all other areas exposed to the weather.// //Domestic water lines exposed to weather.// Heat tracing shall be provided to the extent shown on the drawings (Floor plans and Elevations). Heat tracing shall extend below grade to below the defined frost line. Heating Cable: Flexible, parallel circuit construction consisting of a continuous self-limiting resistance, conductive inner core material between two parallel copper bus wires, designed for cut-to-length at the job site and for wrapping around valves and complex fittings. shall prevent overheating and burnouts even where the cable overlaps itself. Provide end seals at ends of circuits. Wire at the ends of the circuits is not to be tied together. Provide sufficient cable, as recommended by the manufacturer, to keep the pipe surface at 2.2 degrees C (36 degrees F) minimum during winter outdoor design temperature, but not less than the following: 75 mm (3 inch) pipe and smaller with 25 mm (1 inch) thick insulation: 4 watts per foot of pipe. 100 mm (4 inch) pipe and larger 40 mm (1-1/2 inch) thick insulation: 8 watts per feet of pipe. SPEC WRITER NOTE: Coordinate the need for emergency power with project drawings (electric discipline). Electrical Heating Tracing Accessories: Power supply connection fitting and stainless-steel mounting brackets. Provide stainless steel worm gear clamp to fasten bracket to pipe.
232113.docx