Table of Contents A. General Information How Heating Cable Work Heating Cable Application Material Required Tools Required Receipt, Storage and Transportation Before Installation Warnings Page 3 Page 3 Page 3 Page 4 Page 4 Page 4 Page 4 Page 5 B. Select the Proper Heating Cable Length Page 6 C.
A．General Information How Heating Cable Work The Problem Thermal insulation alone will not prevent pipes from freezing. For example, a 19mm (0.75in) pipe having 25mm (1in) thick insulation will freeze solid in only 13 hours when the ambient temperature is at -10°C (14°F). Frozen water pipes can burst causing loss of supply, flooding, and damage.
Material Required Electric Heating Cable Adhesive tape with thermal resistance greater than 80°C/175°F 1/2in. fiberglass or equivalent non-flammable pipe insulation Tools Required Receipt, Storage and Transportation Receipt Compare the materials against the invoice and check to verify the proper materials have been received. The cable’s model number is printed on its label.
Warnings These are vitally important safety warnings that must be followed. Failure to do so could cause overheating and result in serious fire hazard or electrical shock) Improper installation use and/or maintenance of electrical heating cable can cause fire, electric shock and/or freezing of pipe. Make sure there is a properly grounded electrical outlet close enough to plug in the cable. Heating cables must be installed in compliance with the (U.S.
B．Select the Proper Heating Cable Length Use the following table to select the proper heating cable. (length) Pipe Length Pipe Diameter 3’ 4’ 1/2” 3 3 3/4” 3 3 1” 3 3 1.25” 3 3+3 1.
C. Installation Instructions Pre-Installation Check The heating cable should be tested to ensure electrical integrity with at least a 500 VDC megohmmeter (megger) between the grounding pin and any of the other two pins. Minimum resistance should be 20 megohmmeter. Readings below 20 megohmmeter may mean the electrical insulation has been damaged, and the heating cable must be replaced. Ensure the service voltage available is correct for the heating cable system.
Caution Once the heating cable has been run for the entire section, begin fastening it with application tape or good quality Listed fiberglass tape (listed fiberglass tape with temperature rating higher than 80°C (175°F) to the pipe. In order to keep the thermostat and the entire length of heating cable tightly in contact with the pipe, circumferential bands of tape should be installed at approximately 15cm (6in) intervals. The thermostat should be placed on the coldest end of the pipe.
Warning: Never use more than 17mm (0.5in) of fiberglass insulation or other not fire-retarded insulation material for the heat tracing system. (The overall R value of the insulation, protective barrier and waterproof barrier should not be greater than 2.0). Over-insulation can cause the heating cable to overheat and cause fire hazard or electrical shock. Electrical Requirements Make sure that the heating cable load you are connecting is within the rating of your control system.
D. Troubleshooting Symptom Circuit Breaker Trips Problem Causes Circuit breaker is undersized. Replace the circuit breaker if defective or improperly sized. Defective circuit breaker. Check to see if existing power wire sizing is compatible with larger sized breakers. Physical damage to the heating cable may be causing a direct short. Check for where there may have been maintenance work done. GFCI is undersized. Replace undersized GFCI with 30-mA GFCI. Remove the insulation and replace the cable.
