Cut Sheet

nVent.com | 3nVent.com | 3Raychem-DS-H59485-FrostGuard-EN-1805
HEATING CABLE SELECTION FOR PIPE FREEZE PROTECTION
Pipe freeze protection
Use the tables to below to select the correct heating cable length.
FrostGuard 120 V (FG1) Heating Cable Selection
Table 1 Metal Pipes Table 2 Plastic Pipes
Table 1 Metal Pipes
Table 2 Plastic Pipes
Add 1 foot to your pipe length for each valve or spigot on your pipe system. If cable selected is longer than the pipe, spiral it
evenly along the entire pipe.
Add 1 foot to your pipe length for each valve or spigot on your pipe system.
If cable selected is longer than the pipe, spiral it evenly along the entire pipe.
Pipe length (ft)
Pipe diameter (in)
Pipe length (ft)
Pipe diameter (in)
2 1/2
2
1 1/2
1
1/2
2 1/2
2
1 1/2
1
1/2
FG2-
6L
FG2-
12L
FG2-
18L
FG2-
24L
Pipe diameter (in)
2 1/2
2
1 1/2
1
1/2
Pipe diameter (in)
2 1/2
2
1 1/2
1
1/2
FG1-6P FG1-12P FG1-18P FG1-24P FG1-36P FG1-50P FG1-75P FG1-100P
FG1-6P FG1-12P FG1-18P FG1-24P FG1-36P FG1-50P FG1-75P FG1-100P
Pipe length (ft)
Pipe length (ft)
10 20 30 40 50 60 70 80 90 1000
10 20 30 40 50 60 70 80 90 1000
10 20010 200
FG2-
6L
FG2-
12L
FG2-
18L
FG2-
24L
FROSTGUARD 240 V (FG2) HEATING CABLE SELECTION
Table 1 Metal Pipes Table 2 Plastic Pipes
Table 1 Metal Pipes
Table 2 Plastic Pipes
Add 1 foot to your pipe length for each valve or spigot on your pipe system. If cable selected is longer than the pipe, spiral it
evenly along the entire pipe.
Add 1 foot to your pipe length for each valve or spigot on your pipe system.
If cable selected is longer than the pipe, spiral it evenly along the entire pipe.
Pipe length (ft)
Pipe diameter (in)
Pipe length (ft)
Pipe diameter (in)
2 1/2
2
1 1/2
1
1/2
2 1/2
2
1 1/2
1
1/2
FG2-
6L
FG2-
12L
FG2-
18L
FG2-
24L
Pipe diameter (in)
2 1/2
2
1 1/2
1
1/2
Pipe diameter (in)
2 1/2
2
1 1/2
1
1/2
FG1-6P FG1-12P FG1-18P FG1-24P FG1-36P FG1-50P FG1-75P FG1-100P
FG1-6P FG1-12P FG1-18P FG1-24P FG1-36P FG1-50P FG1-75P FG1-100P
Pipe length (ft)
Pipe length (ft)
10 20 30 40 50 60 70 80 90 1000
10 20 30 40 50 60 70 80 90 1000
10 20010 200
FG2-
6L
FG2-
12L
FG2-
18L
FG2-
24L
HEATING CABLE SELECTION FOR ROOF AND GUTTER DE-ICING (120 V ONLY)
Find the number of feet of heating
cable needed per foot of roof edge in
table to the right. Then, calculate the
amount of total heating cable length
you need 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 edge (ft) x 0.5*
C Total gutter length (ft)
D Total downspout length (ft)
+ 1 (ft) [double if looping]
= Total heating cable length (ft)
Length of Cable Per Foot of Roof Edge (ft)
Standing Seam Metal Roof
Overhang (in) Standard Roof 18 inch Seam 24 inch Seam
None* 2 2.5 2
12 in 2.8 2.8 2.4
24 in 3.8 3.6 2.9
36 in 4.8 4.3 3.6
* Gutter required
Note: nVent recommends a gutter and downspouts to provide a continuous path for
melted water.
• If downspout is in the middle of the run, loop the FrostGuard down and back up. Double
the length of the downspout for determining the length of FrostGuard 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.
• For gutters wider than 6 inches contact nVent, [phone].
*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.