Danfoss SRIG Pre Operating guide
Instructions
Danfoss SRIG Pre-Terminated Cable
Câble SRIG Danfoss avec fiche électrique
EN
FR
Instruction Danfoss SRIG Cable
1 Introduction
Danfoss Self-Regulating Iceguard pre-terminated
cable is a self-regulating cable, which is mainly
used for ice and snow melting on roofs, in gutters,
in down pipes and on water pipes to prevent them
from freezing.
Self-regulating heating cables are designed with
a temperature dependant resistant element between two parallel copper conductors.
When the conductors are connected to the mains,
a current goes through the temperature dependant resistant element which will then heat. As the
element is heated the resistance value rises causing the current to decline and heating is reduced.
This explains the self-regulating effect.
This limiting of the output takes place independently on the entire length of the cable according
to the actual ambient temperature.
If the ambient temperature rises the heating effect
of the cable is reduced. Due to this self-regulating
capability, overheating of the cable can be
avoided, also if two heating cables are touching or
crossing.
As self-regulating heating cables always give off a
small amount of effect, it is recommended to connect the heating cable via a thermostat to disconnect the mains when heating is not required.
Danfoss SRIG cables secure against ice formations
in roof gutters.
• No water damages on/in the house
• No falling icicles or icebound roof gutters
• No risks for pedestrians
• No repair costs after winter
• No frozen water pipes
Outer sheath
Screen
Insulation
Bonded jacket
Self-regulating heating element
Connecting conductor
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Instruction Danfoss SRIG Cable
6
5
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3
2
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2 Cable specifications
Application Roof / gutters / downpipes / water pipes
Colour Black
Dimensions 0.52 x 0.24 inch
Sheath Polyolefin UV
Voltage 120 V
Output 5 W/ft at 50°F
Min. installation temperature -23°F
Min. start-up temperature -40°F
Max. temperature ON / OFF 150°F / 185°F
Length of cold-lead 6 ft
Intended use as per IEEE 515.1 A + B
Intended use as per CSA Std. 130-03 WS + G
EN
Approvals
• The effect stated is measured with the Iceguard heating cable installed on an insulated metal pipe, according to DIN E VDE 0254 similar to CSA C22-2, NO.130-03, 6.2.4.3.
• When self-regulating cables are installed in the open, the effect may be reduced by approx. 50%.
• When planning the installation it must be considered that self-regulating cables may reduce the operational
effect over several years.
Cable heating power
W/ft
The recommended test method is:
1. Power up the cable.
2. Wait 5 minutes.
3. Measure the ambient
temperature.
4. Measure the amperage draw of
the cable.
5. Convert the Amperage that the
cable draws into Watt.
6. Dived the wattage with the feet
length of the cable.
7. Compare the result with the
table on page 3.
8. The result may vary up to +/-
32 50 68 86 104 122 140
Temperature °F
10% due to the uncertainties of
the temperature along the entire
cable.
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Instruction Danfoss SRIG Cable
3 Caution
1. Danfoss SRIG cables are only for safe (non
hazardous) areas.
2. Finished or painted pipes or containers must
be completely dry when installing. The heating cable must only be used in the manners
recommended by Danfoss and should be
properly connected to the main electrical
source.
3. Connection of the heating cable must be
done by an authorised electrician in compliance with all national, state, provincial and
local electrical codes.
4 General installation instructions
1. Measure the insulating resistance of the heating cable immediately before the installation
is begun.
2. Make sure that the necessary materials are
present at the building site.
3. Remove any sharp objects and irregularities
on the pipe system, so the heating cable are
not damaged.
4. The surface onto which the heating cable is to
be installed must be non-combustable, clean
and free from sharp objects.
5. The heating cables bending diameter must
not be less than 2 inches. The cable must only
be bent on the flat side.
6. The heating cables screen must be grounded
in accordance with local electrical regulations.
7. The power circuit must be equipped with an
isolation switch or a similar overload protection device.
4. The heating cable must be protected against
excess strain and tension.
5. Do not use SRIG for vinyl garden hose applications.
6. Do not install SRIG behind walls, in ceilings,
through flooring or underneath roof covering.
7. Do not install the cable inside any pipes.
8. Residual current device (RCD) protection is
required (max. 30 mA).
9. To reduce energy consumption we strongly
recommend to switch off the heating cable,
i.e. by using a thermostat.
10. At low temperatures the heating cable can
become stiff and difficult to work with. This
problem can be solved by connecting the
cable to the mains for a short period of time.
11. The cable insulation resistance must be measured before and after installation.
12. The presence of a heating cable must be made
evident by caution signs or markings at the
power connection fittings and/or frequently
along the circuit line, as well as being stated
in any electrical documentation following the
installation.
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Instruction Danfoss SRIG Cable
5 Storage of self-regulating cables
• Heating cables and connecting leads must be
kept in a clean and dry place.
• Avoid contact with chemicals and petrochemical products during storage of the cables.
• Do not expose the heating cables to mechani-
cal strain.
6 Frost protection of roofs
During periods with cold and precipitation dangerous and damaging ice formations are often
formed on the roof, in roof gutters and down
pipes, especially when the temperature is around
freezing point.
Concerning roof constructions with low slope it
is often sufficient to install Danfoss SRIG cables in
roof gutter and down pipe to ensure an efficient
draining off of the melt water.
Concerning roof constructions with high slope it
is often necessary also to install the heating cable
on the lowest section of the roof. If the roof is supplied with snow fence the cable can be installed
from this to the roof edge with advantage.
Concerning valleys, the cable must be mounted in
the valley. To achieve efficient protection the C-C
distance should not exceed 6 inches.
Installation:
In many ordinary roof gutters it is sufficient to
install one cable length in roof gutter and down
pipe.
• The storage temperature may not drop below
-40°F and may not exceed +140°F.
• Are the heating cables and connecting leads
kept in moist rooms or at building sites, they
must be protected against moisture - also
during storage for a short period (e.g. when
installing the cable terminal).
EN
With the above mentioned installation the system
will typically ensure ice and snow melting down
to a temperature of approx. 14°F.
If you want to frost protect the roof down to 4°F,
a general rule will be to double the effect, and for
-22°F to triple the effect.
If the cable lies across an edge etc. the spacing
clips can be used to relieve strain on the cables,
e.g. where the cable enters the down pipe.
Relief of a cable hanging in the down pipe is necessary when the cable length in the pipe exceeds
approx. 9.8 inches.
The cable in the down pipe should continue to
frost-proof depth under the surface of the ground
(approx. 3.2 ft).
Cables installed on the roof must always be positioned upwards/downwards and not along the
roof. The installation can be made with a zigzag
pattern as shown on the illustration on the next
page.
Typically, the cables should be installed with a
C-C distance of approx. 6 inches. To ensure the
distance spacing clips can be used.
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