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Cable length selection Tables
Table 1. Metal pipe
Number of heating cable runs required
Lowest Expected Temperature
Metal Pipe
Insulation
Pipe Size
20°F
Thickness
(–10°C)
1/2 in
1/2 in
1
3/4 in
1
1 in
1
1 1/4 in
1
1 1/2 in
1
3/4 in
1/2 in
1
3/4 in
1
1 in
1
1 1/4 in
1
1 1/2 in
1
1 in
3/4 in
1
1 in
1
1 1/4 in
1
1 1/2 in
1
2 in
1
1 1/2 in
3/4 in
1
1 in
1
1 1/4 in
1
1 1/2 in
1
2 in
1
Table 2. plastic pipe
Number of heating cable runs required
Lowest Expected Temperature
Plastic Pipe
Insulation
Pipe Size
20°F
Thickness
(–10°C)
1/2 in
1/2 in
1
3/4 in
1
1 in
1
1 1/4 in
2
1 1/2 in
2
3/4 in
1/2 in
1
3/4 in
1
1 in
1
1 1/4 in
1
1 1/2 in
2
1 in
3/4 in
1
1 in
1
1 1/4 in
1
1 1/2 in
1
2 in
1
1 1/2 in
3/4 in
1
1 in
1
1 1/4 in
1
1 1/2 in
1
2 in
1
= Increase insulation thickness
THERMAL buiLding SOLuTiOnS
0°F
–20°F
–40°F
(–20°C)
(–30°C)
(–40°C)
1
2
2
1
2
2
2
2
2
2
2
3
2
3
3
1
1
2
1
2
2
1
2
2
2
2
2
2
2
3
1
1
2
1
2
2
1
2
2
1
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
2
1
2
2
0°F
–20°F
–40°F
(–20°C)
(–30°C)
(–40°C)
2
2
2
2
3
2
3
3
2
3
3
3
2
2
2
2
2
3
2
2
3
2
3
3
3
3
1
2
2
1
2
2
2
2
3
2
3
3
2
3
3
1
1
2
1
2
2
1
2
2
1
2
2
2
2
3
EN-FrostexFreezeProtection-IM-H56581 12/14
1C. Calculate the total length of heating
cable required
Multiply the number of heating cable runs
by your pipe length. Add one extra foot (30
cm) for each valve in your line. Add one
extra foot (30 cm) for the distance to the
power connection. For installations in a
crock, add an additional 2 feet (60 cm) of
heating cable. After cutting the Frostex
heating cable to the length you need, pro-
ceed to Step 2.
Example:
Pipe size and
material:
Lowest ambient
temperature:
Pipe length:
Valves:
The water connection is in a crock.
From Table 2, Plastic Pipe, for –20°F
(–30°C), either two or three runs of
Frostex heating cable is required depend-
ing on pipe insulation thickness.
Optimal pipe insulation thickness: 3/4 in
Selecting 3/4 in thick insulation requires
two runs of Frostex heating cable
installed along the entire length of the
pipe (Table 2).
The total length of heating cable equals:
32 ft (10 m)
2 runs x 16 ft (5 m) of pipe
+ 1 ft (0.3 m) for one ball valve
+ 1 ft (0.3 m) for one power connection
+ 2 ft (0.6 m) for installing in a crock
36 ft (11 m)
total length
Note: Do not use more than 50 feet
(15 meters) of heating cable per
plug. If the total calculated length
exceeds 50 feet (15 meters), you
will need additional 9800 FlexFit
plugs and outlets. Longer circuit
lengths will blow the nonreplace-
able fuse in the 9800 FlexFit plug.
If you require more than 50 feet
per length (15 meters), call Pentair
Thermal Management for informa-
tion on other products.
1-inch diameter,
plastic
–20°F (–30°C)
16 feet (5m)
1 ball valve is used
4 / 10
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