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Old 02-20-2015, 09:26 PM   #21
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I have been using standard gfci breakers for all the easy heat i installed within the last two months. No issues reported.
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Old 03-02-2015, 03:43 PM   #22
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NEC requires the use of GFEP (30ma) protection. If you use GFCI it can nuisance trip. It may not happen the first year but as they get older, they will trip more often. The in-rush using Self Regulating cables are tremendous so figure that in to your calculation when buying the GFEP breaker.

The "lesser" prices cables usually comes with a "lesser" warranty (1-3 years). The better self regulating cables should come with a 10 year warranty. With pipe freeze, we recommend 5 watt/ft cable. For gutter/leader ice, we recommend 12 watt/ft.

With pipe freeze, if you don't insulate, it will not work as well or at all. You should use a temperature sensor as activation.
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Old 03-02-2015, 04:15 PM   #23
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Self regulating heat trace will have inrush current for the first 3.5 seconds. suggest you use a magnetic breaker on the branch circuit. EX: 74 ft of Cromalox 8W/ft. at -26c inrush was 15.9 amps at 120VAC. After 4 seconds the amp draw stabilized to 5.4A at 120VAC.

The inrush is due to the self-regulating dielectric material. the longer the length the more inrush. Nothing to do with inductive reactance or the like.
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Old 03-02-2015, 04:58 PM   #24
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We typically use Nelson Self Regulating Heat Trace Tape type CLT-5/CLT-25 for Drain Lines in -20 C Freezers.
Most is connected to 208V (CLT-25), some connected to 120V (CLT-5).

All Branch Circuits are Protected via an OCPD with GFPE (30ma trip threshold).

--Scott (EE)
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