Jhsf1 120 V Heating Cable Selection For Roof & Gutter De-Icing - HEATIT JHSF1 Manuel D'installation Et Entretien

Electrical codes
Article 426 of the National Electrical Code (NEC), and Part 1, Section 62 of the Canadian Electrical Code (CEC), govern the installation
of HEATIT heating cables for roof and gutter de-icing and must be followed.
Important:
For the HEATIT Thermal Building Solutions warranty to be valid, you must comply with all the requirements
outlined in these guidelines.
All design information provided here is based on"standard"shake or shingle roof application.
JHSF1 120 V heating cable selection for roof & gutter de-icing
1.Calculate the heating cable length.
You can find the number of feet of heating cable needed per foot of roof edge in table 3. And then , calculate the amount of total
heating cable length by using the following formula:
Length=A+B+C+D
A Roof edge length (ft) x Length of cable per foot of roof edge(ft)
B Roof extension: Roof edge (ft) x 0.5*
C Roof gutter: Total gutter length (ft)
D Downspout: Total downspout length (ft) +1 (ft) [double if looping]
= Total heating cable length (ft)
*
Roof extension: This length allows the heating cable to extend into the gutter to provide a continuous drain path, or where no gutters are present,
extends beyond the roof edge to form a drip loop.
Example: (shingle roof)
HEATIT heating cable required:
HEATIT required:
Table 3. Typical spacing and layout measurements
Eave overhang (in)
None
12
24
36
Note:
HEATIT Thermal Building Solutions recommends the use of gutters and downspouts to provide a continuous path formelted water.
If downspout is in the middle of the run, loop the JHSF1 down and back up. Double the length of the downspout for determining
the length of JHSF1 to install.
• For valleys, run the heating cable two thirds of the way up and down the valley.
• For gutters 5-6 inches wide use 2 runs of heating cable.
--JHSF1
JHSF1-100-1
Shingle roof
2
2.8
3.8
4.8
Standing seam metal roof
18 in seam
2.5
2.8
3.6
4.3
24 in seam
2
2.4
2.9
3.6