10
A. For Typical Applications
Step 1. For each area shown in Figure 2, measure the required dimensions and
then calculate the necessary cable length (see Figure 2, Tables 3 and 4).
Add the results to determine the total length of the cable.
Figure 2.
E
B
CD
A
Table 3. Cable Length Calculation
Location What to Measure How to Calculate
Along the roof
Eave depth (A)
Eave (Roof) length (B)
Eave length(B) x Multiplier (see Table. 4)
Attic window
The perimeter around
the attic windows (C)
Number of attic windows × perimeter (C)
Valley Number of valleys (D) Number of valleys × 6-feet
Gutter Gutter length (B) Gutter Length × 2
Drainage pipe Drainage pipe length (E)
Number of drainage pipes × length of
drainage pipes × 2
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