To use the 3M Heat Trace Bill of Materials Tool, visit
3M.ca/HeatTrace
16
Step 3: Determine how much cable you will require.
Heat tracing circuit lengths are based on several conditions that must be simultaneously taken into account
and include:
•
Length of piping (including extra allowances)
• Operating voltage
• Available branch circuit breaker sizes
• Expected start-up temperature
• Maximum allowable circuit lengths
Every heat tracing circuit will require some additional heating cable to make the various splices and terminations.
Additional cable will also be needed to provide extra heat at valves, pumps, miscellaneous equipment and pipe
supports. Use the following guidelines to determine the amount of extra cable required:
• Valves and pumps: use allowances from
Table 1.3.1
• Miscellaneous equipment and pipe supports: use allowances from
Table 1.3.1 A
To determine circuit lengths, a voltage selection must be made from the available voltages gathered as part of Step 1.
• TTS™ Self-Regulating Heating Cable intended for use on 110-120 Vac will have a catalogue number followed by a 1
(i.e., TTS-X-1)
• TTS™ Self-Regulating Heating Cable intended for use on 208-240 Vac will have a catalogue number followed by a
2 (i.e., TTS-X-2)
In Step 2, the proper TTS™ Self-Regulating Heating Cable (5, 8 or 10) was selected from
selection chart 1.2.1
or
1.2.2.
Using voltage and cable selections plus information from
Table 1.3.2
or
1.3.3,
the maximum heating cable lengths and
branch circuit breaker requirements can be determined.
• If a branch circuit breaker of a known amperage will be used, match this rating with the cable selection and the
temperature at which the cable will be energized
•
If no circuit breaker sizing has been established, find the maximum circuit length that meets or exceeds the length of
the appropriate TTS™ Self-Regulating Heating Cable at the start-up temperature of the cable and determine what
amperage branch circuit breaker will be required
Remember the start-up temperature does not necessarily match the expected low ambient temperature.
!
Summary of Contents for TTS-5-1-OJ
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