What resistance should heat trace be?
20 megohms
Manufacturers will tell you that anything over 20 megohms is acceptable, but keep in mind, 20 megohms is not perfect resistance to ground. Consider replacing that run of heat trace if anything between 20 and “infinite” are seen.
Does heat trace need to be on emergency power?
Heat tracing operation should be monitored and alarmed, and powered from an emergency power source. Heat tracing may be required for control tubing, especially whenever it is exposed to below-freezing outdoor temperatures.
Can you cross self-regulating heat trace?
Constant wattage heat trace and MI cable cannot cross or touch itself. When a constant wattage heat trace is crossed over itself, the heat only increases. When applying constant wattage heat cables to your pipes or other surfaces, ensure that they do not cross and are spaced sufficiently.
How do you troubleshoot heat tape?
Circuit temperatures may be too low because:
- a thermostat or process controller setpoint is not correct.
- a thermostat is not wired correctly.
- a cable is not connected to power.
- a cable is connected to the wrong voltage.
- a temperature sensor is incorrectly placed.
- a temperature sensor is wired incorrectly.
Can heat trace shock you?
Heat-tracing equipment has a protection trip threshold of approximately 30mA, which is enough current to cause significant shock to personnel.
How long does it take for heat trace to warm up?
Feel along the length of the heat tape. It should be getting warm. If the heat tape fails to warm up, after 10 minutes, the thermostat or the heat tape itself is bad. Remove the heat tape and install a new unit.
Should heat tape be warm to the touch?
Feel along the length of the heat tape. It should be getting warm. If the heat tape fails to warm up, after 10 minutes, the thermostat or the heat tape itself is bad.
How long does heat tape usually last?
Replace Heat Tape Regularly Speaking of replacing, heat tape only has a 3-year lifespan. Most heat tape manufacturers warn that you should replace your heat tapes every 3 years minimum. Heat tape has a near-constant connection with both water and electricity and usually isn’t protected well from the elements.