nVent RAYCHEM FROSTGUARD User manual

nVent.com | 1Raychem-DS-H59485-FrostGuard-EN-1805
PREASSEMBLED HEATING CABLE
FROSTGUARD
nVent.com | 1
PRODUCT OVERVIEW
nVent RAYCHEM FrostGuard preassembled self-regulating
heating cables are designed for residential and commercial
metal and plastic pipe freeze protection and roof and gutter
de-icing applications. 120 V FrostGuard cables are available in
6, 12, 18, 24, 36, 50, 75 and 100 foot lengths, and each comes
assembled with a 6-ft power cord and 3-prong, grounded, lighted
plug to show the system is on. 120 V FrostGuard cables are ideal
for smaller jobs such as roof and gutter de-icing on porches
and overhangs, as well as for pipe freeze protection on metal or
plastic pipes up to 2-1/2inches in diameter.
240 V FrostGuard cables are available in 6, 12, 18, and 24 foot
lengths and each come assembled with a 6-ft power cord for
terminating in a junction box. Due to their short lengths, 240 V
FrostGuard cables are designed only for pipe freeze protection
applications on pipes up to 2-1/2inches in diameter.
nVent.com | 1
FROSTGUARD PREASSEMBLED HEATING CABLE SPECIFICATIONS
Catalog number 120 V with 6-ft cold lead & lighted plug 208-240 V with 6-ft cold lead
FG1-6P FG2-6L
FG1-12P FG2-12L
FG1-18P FG2-18L
FG1-24P FG2-24L
FG1-36P
FG1-50P
FG1-75P
FG1-100P

nVent.com | 2Raychem-DS-H59485-FrostGuard-EN-1805
FROSTGUARD PREASSEMBLED HEATING CABLE SPECIFICATIONS
Application
Pipe freeze protection and
roof and gutter de-icing Pipe freeze protection
Voltage 120 V 208-240 V
Nominal power output on pipes
at 40°F (5°C) (W/ft) 6 6
Nominal power output in ice or snow
at 32°F (W/ft) 8N/A
Maximum cable width (inch/mm) 0.45 (11.4)0.45 (11.4)
Maximum cable thickness (inch/mm) 0.24 (6.1)0.24 (6.1)
Cold lead length (ft/m) 6(1.83)6(1.83)
Maximum exposure temperature 150°F (65°C) 150°F (65°C)
Minimum installation temperature 5°F (–15°C) 5°F (–15°C)
Minimum bend radius (inch/mm) 5/8(16)5/8(16)
APPROVALS
-WS -W
GROUND-FAULT PROTECTION
To minimize the danger of fire from sustained electrical arcing if the heating cable is damaged or improperly installed, and to comply
with the requirements of nVent, agency certifications, and national electrical codes, 30-mA equipment or 5-mA personnel ground-
fault protection must be used on each FrostGuard heating cable branch circuit. Arcing may not be stopped by conventional circuit
protection.
NOMINAL POWER TEMPERATURE CURVE FOR PIPES
0 20 40
0
2
4
6
8
10
60 80 100
Pipe temperature (°F)
Power output (W/ft)

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 5-6inches wide, use 2runs of heating cable.
• For gutters wider than 6inches 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.

4
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©2018 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners.
nVent reserves the right to change specifications without notice.
Raychem-DS-H59485-FrostGuard-EN-1805
North America
Tel [phone]
Fax [phone]
[email protected]

Pipe Freeze Protection
Roof and gutter de-icing: standard roof
Roof and gutter de-icing: standing seam metal roof
DESCRIPTION
nVent RAYCHEM FrostGuard 120 V preassembled self-regulating
heating cables are designed for residential and light commercial
metal and plastic pipe freeze protection and roof & gutter de-icing
applications.FrostGuard 120 V heating cables are available in 6, 12,
18, 24, 36, 50, 75 and 100 foot lengths, and each comes assembled
with a 6-ft power cord and lighted plug.
KIT CONTENTS
1 FrostGuard preassembled electric heating cable
2 Roof and gutter labels
2 Pipe labels
ADDITIONAL ITEMS REQUIRED BUT NOT SUPPLIED
FOR PIPE APPLICATIONS
• Ground-fault protected outlet (GFCI)
• Waterproof thermal insulation (e.g. preformed foam)
• RAYCHEM H903 Application Tape and Electric Traced Labels
ADDITIONAL ITEMS REQUIRED BUT NOT SUPPLIED
FOR ROOF & GUTTER APPLICATIONS
• RAYCHEM H913/H914 Roof Clips (10 clips for each 7 linear
feet of roof edge)
• RAYCHEM H915 Hanger Bracket (1 for each downspout, 2 if
looping)
• UV Resistant cable ties
• Ground-fault protected outlet (GFCI)
APPROVALS
-WS
Fire and Shock Hazard. This product is an
electrical device that must be installed correctly to
ensure proper operation and to prevent shock or
fire. Read these important warnings and carefully
follow all the installation instructions.
• To minimize the danger of fire from sustained
electrical arcing if the heating cable is
damaged or improperly installed, and to
comply with the requirements of nVent
agency certifications, and national electrical
codes, ground-fault equipment protection
must be used on each heating cable branch
circuit. Arcing may not be stopped by
conventional circuit protection.
• For pipe freeze protection applications, use
only fire-resistant insulation materials such
as preformed foam or fiberglass.
• Do not damage the heating cable and power
cord or plug. Remove any damaged cables
from service immediately.
• Do not use any wire or metal clamps to attach
the cable to the pipe. Use tape (1/2 inch wide
to 1 inch wide) or plastic cable ties.
• Do not install the heating cable underneath
any roof covering for roof and gutter de-icing.
• Leave these installation instructions with the
user for future reference.
WARNING:
120 V Preassembled Electric Heating Cables for Pipe Freeze
Protection and Roof & Gutter De-Icing Installation Instructions
FROSTGUARD 120 V

2 |nVent.com
General requirements for pipe freeze protection:
• FrostGuard heating cables may be used on metal and plastic
water pipes but not on exible vinyl tubing (such as garden
hoses).
• FrostGuard heating cables are not intended for use inside any
pipes, for freeze protection of liquids other than water, or for
use in classied hazardous locations.
• Install with a minimum of 1/2” re-resistant, waterproof
thermal insulation.
• Never use on any pipes that may exceed 150°F (65°C).
• Do not use an extension cord.
General instructions:
• Install only in accessible locations; do not install behind walls
or where the cable would be hidden.
• Do not run the heating cable through walls, ceilings, or oors.
• Connect only to ground-fault protected outlets that have been
installed in accordance with all prevailing national and local
codes and standards and are protected from rain and other
water.
FrostGuard 120 V (FG1) heating cable selection for pipe freeze protection:
Use the tables to below to select the correct heating cable. Add
1 foot to your pipe length for each valve or spigot on your pipe
system.
The charts assume the lowest outside temperature is 0°F
(–18°C), with a minimum of 1/2” thick waterproof, re-resistant
thermal insulation (preformed foam). For protection to –20°F
(–29°C), use 1” thick insulation.
Important: All thermal and design information provided here is
based upon a “standard installation”: heating cable fastened to a
pipe and thermally insulated. For any other method of installation
or application, consult nVent at [phone].
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
Pipe Freeze Protection
Electrical codes
Articles 422 and 427 of the National Electrical Code (NEC), and
Part 1, Section 62 of the Canadian Electrical Code (CEC), govern
the installation of FrostGuard heating cable for pipe freeze pro-
tection and must be followed.
Important: For the nVent warranty to be valid, you must comply
with all the requirements outlined in these guidelines.
All thermal and design information provided here is based upon
a “standard” installation with heating cable fastened to an insu-
lated pipe. For any other application or method of installation,
consult nVent at [phone]

X
X
•
•
nVent.com | 3
Tape or
cable ties
FG heating
cable
12 inches
Waterproof covering
Pipe label
End view
1/2 in insulation
Figure 1. Straight-traced installation
Tape or
cable ties
FG heating
cable
12 inches
10 feet
Glass tape
(typical) Heating
cable
Tape after spiraling
heating cable on pipe
Wrap loops in opposite direction
Pull heating cable
loop length
Apply glass tape before
spiraling heating cable on pipe
Waterproof covering1/2 in insulation
Pipe label
Figure 2. Spiral-traced installation
Heating cable installation
1. Prepare for installation.
• Store the heating cable in a clean, dry place.
• Complete piping pressure test.
• Prior to installing the cable, remove any sharp surfaces on
the pipe that might damage the heating cable.
• Review the FrostGuard heating cable design and compare
to materials received to verify that you have the proper
FrostGuard heating cable.
• Walk the system and plan the routing of the FrostGuard
heating cable on the pipe.
2. Position and attach heating cable to pipe.
• Be sure all piping to be traced is dry.
• Install heating cable, using straight tracing Figure 1, or
spiraling Figure 2.
• For straight tracing, install the heating cable on a lower
half of the pipe; for example, in the 4 o’clock or 8 o’clock
position.
• Be sure to install the additional heating cable required for
valves, anges, etc. as shown in Figures 1 and 2.
• When the design calls for spiraling, begin by suspending
a loop every 10 feet as shown in Figure 2. To determine
the loop length, divide the FrostGuard length by your pipe
length and multiply by 10. For example, if you are using a
50 ft FrostGuard on a 40 foot pipe, leave a 12-foot loop of
heating cable at every 10-foot section of pipe. Grasp the
loop in its center and wrap it around the pipe. Even out the
distance between spirals by sliding the wraps along the
pipe. Use glass tape to secure the center of the loop to the
pipe.
• Fasten FrostGuard heating cable to the pipe at 1-foot
intervals using H903 berglass application tape or nylon
cable ties. Do not use vinyl electrical tape, duct tape, metal
bands, or wire.
• If excess cable remains at the end of the pipe, double it
back along the pipe.
3. Check the installation.
• Prior to installing thermal insulation, make sure the heating
cable is free of mechanical damage (from cuts, clamps,
etc.) and thermal damage (from solder, overheating, etc.).

4 |nVent.com
Figure 3. Insulation
Cord label
Pipe label
Strain relief
Figure 4. Strain relief Note: Pipes must be fully insulated.
4. Install thermal insulation.
• A reliable FrostGuard system depends on properly installed
and dry, weatherproofed thermal insulation.
• Ensure that at least 1/2” of preformed foam or equivalent
thermal insulation is used and that all piping, including
valves, joints, and wall penetrations, has been fully insu-
lated as shown in Figure 3.
• For protection to -20°F (-29°C), use 1” thick insulation.
• Install the insulation on the piping as soon as possible to
minimize the potential for mechanical damage after instal-
lation.
• Be sure the FrostGuard 120 V label is visible on the outside
of the thermal insulation.
5. Finishing the installation.
• To prevent damage to the heating cable or cord, secure the
power cord (cold lead) with a plastic cable tie, glass cloth
tape, or duct tape as shown in Figure 4.
• Two labels indicating the presence of electric pipe heating
cable are included with the heating cable. Attach the two
“Electric Traced” labels on the outer surface of the pipe
insulation at suitable intervals to indicate the presence of
FrostGuard electric heating cable.
6. Starting the system.
• nVent recommends that the system be tested per the
“Cable testing and maintenance” section below.
• Plug the heating cable into a 120-V ground-fault protected
outlet.
• Check the circuit breaker to verify power to the cable.
• Standing water in the pipe should feel warm within an hour.
Cable testing and maintenance
Using a 2500-Vdc megohmmeter, check the insulation resis-
tance between both of the rectangular (power) prongs on the
plug and the round (ground) prong after installing the heating
cable. Minimum reading should be 1000 megohms.
Record the original values for each circuit, and compare subse-
quent readings taken during regular maintenance schedules to
the original values.
If the readings fall below 1000 megohms, replace the FrostGuard
cable with a new unit. Do not attempt to repair the unit.
WARNING: Fire and Shock Hazard.
Damaged heating cable can cause electrical shock, arcing, and fire.
Do not attempt to repair or energize damaged heating cable. Remove
it at once and replace with a new length.

X
X
•
•
nVent.com | 5
Roof & Gutter De-icing
Note: Route and secure the heating cable to avoid possible mechanical
damage, such as from ladders, etc.
General requirements for roof & gutter de-icing:
• FrostGuard is designed to remove melt water, not accumu-
lated snow.
• FrostGuard heating cable will not keep snow or ice from fall-
ing off the roof. Snow fences or snow guards should be used
to eliminate snow movement. For the names of manufactur-
ers of snow guards or snow fences, contact nVent
at [phone].
• FrostGuard heating cables may be used on:
- Roofs made from all types of standard roong materials,
including shake, shingle, rubber, tar, wood, metal,
and plastic.
- Gutters made from standard materials, including metal and
plastic.
- Downspouts made from standard materials, including metal
and plastic.
• Do not use an extension cord.
• Do not install the heating cable underneath any roof covering
for roof and gutter de-icing.
• Install only in accessible locations; do not install behind walls
or where the cable would be hidden.
• Do not run the heating cable through walls, ceilings, or oors.
• Connect only to ground-fault protected outlets that have been
installed in accordance with all prevailing national and local
codes and standards and are protected from rain and other
water.
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 FrostGuard heating cables for roof and gutter de-
icing and must be followed.
Important: For the nVent warranty to be valid, you must comply
with all the requirements outlined in these guidelines.
All design information provided here is based on a “standard”
shake or shingle roof application. For any other application or
method of installation, consult nVent at [phone].

6 |nVent.com
FrostGuard 120 V (FG1) heating cable selection for roof & gutter de-icing
1. Calculate the heating cable length.
Find the number of feet of heating cable needed per foot of roof
edge in Table 3. 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 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)
Eave overhang: 1 ft / 12 in
Roof edge: 15 ft
Roof gutter: 15 ft
Downspout: 15 ft
FrostGuard heating cable required:
ARoof edge: 15 ft x 2.8 =42.0 ft
B Roof extension: 15 ft x 0.5 =7.5 ft
CRoof gutter: 15 ft =15.0 ft
DDownspout: 15 ft + 1 ft =16.0 ft
Total heating required: =80.5 ft
FrostGuard required: FG1-100P
Table 3. Typical spacing and layout measurements
Length of heating cable per foot of roof edge (feet)
Standing seam metal roof
Eave overhang (in) Shingle roof 18 in seam 24 in seam
None 2 2.5 2
12 2.8 2.8 2.4
24 3.8 3.6 2.9
36 4.8 4.3 3.6
Note: nVent recommends the use of gutters 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]
Heating cable installation
2'
UV-resistant cable tie
Figure 5. Standard roof
1. Prepare for installation.
• Store the heating cable in a clean, dry place.
• Use only the following nVent accessories to satisfy code
and agency requirements:
- nVent RAYCHEM H915 Hanger Bracket
- nVent RAYCHEM H913/H914 Roof Clips
• Make certain gutters and downspouts are free of leaves and
other debris.
• Carefully plan the routing of the heating cable for roof and
gutter de-icing.
2. Position and attach the heating cable on roofs.
• Loop the heating cable on the overhang area of the roof. This
is the part that extends past the building wall. Extend the
bottom of each heating cable loop over the roof edge and,
using a UV-resistant cable tie, connect the bottom of each
loop to the cable running in the gutter to ensure a drainage
channel off the roof and into the gutter and downspout. The
cable running in the gutter should remain against the bottom
of the gutter as shown in Figures 5 and 6.
UV-resistant
cable tie
Figure 6. Standing seam metal roof
Table 4. Tracing heights for different roof styles
Shake and Shingle Roof
Roof of
overhang (in)
Tracing width
(in)
Tracing
heights (in)
Feet of
FrostGuard per
foot roof edge
None* 2 18 2
12 2 18 2.8
24 230 3.8
36 242 4.8
Standing Seam Metal Roof**
Eave overhang
(in)
Standing Seam
Spacing (in)
Tracing heights
(in)
Feet of FrostGuard
per foot of roof edge
None* 18 18 2.5
12 18 24 2.8
24 18 36 3.6
36 18 48 4.3
None* 24 18 2.0
12 24 24 2.4
24 24 36 2.9
36 24 48 3.6
*Gutter required
** No additional heating cable is required for gutters when tracing standing
seam metal roofs

nVent.com | 7
Figure 7. Standard roof clip attachments
2/3
1/3
Figure 8. Valleys
• Extend the top of each heating cable loop beyond where the
wall joins the roof.
• Trace two-thirds of the way up each valley with a double run
of heating cable as shown in Figure 8.
• Use H913/H914 roof clips to route heating cable into and
out of the gutter in such a way as to prevent abrasion to
the cable. Protect all cable that protrudes past the lower
opening of the downspout.
• One H913 kit contains ten roof clips for approximately 7
linear feet of roof edge. One H914 kit contains 50 roof clips
for approximately 35 linear feet of roof edge.
• Roof clips may be attached to a shake or shingle roof with
nails or screws as shown in Figure 7. Roof clips may be
attached to a metal roof using screw, nail or adhesive as
shown in Figure 9. (See H56723 installation instruction for
more details.) Reseal the nail or screw holes if necessary
before installing heating cable in the clips.
• A barrier (snow fence) can be placed on the roof above
the heating cable. This prevents damage to the cable and
keeps the installation from coming loose due to ice slides.
The heating cable can be attached to the barrier with
UV-resistant cable ties, instead of using roof clips, if desired.
Do not use wire or other materials because they may
damage the heating cable.
In gutters and downspouts
• Run heating cable along gutters and into downspouts, ending
below the freezing level. Permanent attachment of the cable
to the gutter bottom is not necessary. Loop the heating cable
in downspouts. Do not leave the end of the FrostGuard in air
at the end of the downspout as shown in Figure 10.
• Use H915 Hanger Brackets at the gutter/downspout transition
to protect the heating cable from fraying and from damage from
sharp edges and to provide strain relief as shown in Figure 11.
Refer to the H915 kit instructions for installation details.
• Route and secure cable to avoid possible mechanical
damage, such as from ladders, etc.
Accumulated ice
can be removed.
12 in
Figure 10. Heating cable in downspout
Cable
tie
3. Mark the installation.
Two labels indicating the presence of electric de-icing and
snow-melting equipment on the premises are included with
the heating cable. One label must be posted at the electrical
outlet cover. The other label must be posted at the fuse or
circuit breaker panel. The labels must be clearly visible.
4. Check the installation.
• Prior to plugging in, check to be sure the heating cable is
free of mechanical damage (cuts, clamps, etc.).
• Using a megohmmeter, test each circuit according to the
instructions in the “Heating cable testing and maintenance”
section on next page.
5. Starting the system.
• nVent recommends that the system be tested per the “Cable
testing and maintenance” section below.
• Plug the heating cable into a 120-V ground-fault protected
outlet.
• Check the circuit breaker to verify power to the cable.
Figure 9. Standing seam roof clip
Heating
cable
Hanger
bracket
Figure 11. Hanger brackets

©2018 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its aliates. All other trademarks are the property of their respective owners.
nVent reserves the right to change specications without notice.
Raychem-IM-H59486-FrostGuard120V-EN-1605
nVent.com
NORTH AMERICA
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Heating cable testing and maintenance
Make sure that gutter and downspouts are free of leaves and other
debris prior to the winter season.
Using a 2500-Vdc megohmmeter (2500 Vdc minimum), unplug the
FrostGuard and test the unit by checking the insulation resistance
between the flat blade and the ground pin in the plug. Minimum
reading should be 1000 megohms regardless of FrostGuard length.
Record the original values for each circuit. Take additional readings
during regularly scheduled maintenance and compare to the original
value. If the readings fall below 1000 megohms, inspect heating
cables and insulation for signs of damage.
WARNING: Fire and Shock Hazard.
Damaged heating cable can cause electrical shock, arcing, and fire. Do
not attempt to repair or energize damaged heating cable. Remove it at
once and replace with a new length.
Product specifications
FG1-6P FG1-12P FG1-18P FG1-24P FG1-36P FG1-50P FG1-75P FG1-100P
Cable length (ft/m) 6 (1.8) 12 (3.7) 18 (5.5) 24 (7.3) 36 (11) 50 (15) 75 (23) 100 (30)
Min. power output at 40°F (4°C) on pipe (watts) 36 72 108 144 216 300 450 600
Nominal power output in ice and snow (watts) 48 96 144 192 288 400 600 800
General specifications for all FG1 products
Maximum cable width (inch/mm) 0.45 (11.4)
Maximum cable thickness (inch/mm) 0.24 (6.1)
Heating cable bus wire gauge (AWG) 16
Voltage rating (Vac) 110–120
Plug rating (amps) 15
Circuit breaker sizing minimum (amps) 15 A max.
Cold lead length (ft/m) 6 (1.83)
Maximum exposure temperature 150°F (65°C)
Minimum installation temperature 5°F (–15°C)
Minimum bend radius (inch/mm) 5/8 (16)
Electrical classification Nonhazardous areas only
Exposure to chemicals None