Self-regulating heating cables with
a non-heating service cable
ELSR-M-15-2-BO
ELSR-N-20-2-AO
ELSR-N-30-2-AO
GENERAL CONDITIONS
• The connector which connects the cold end and the heating circuit must not be
installed in a bend. The radius of any bend in the cable must not be shorter than
is set for the individual types. Bending should be applied to the flat side.
• If the heating cable or the supply cord is damaged, it must be replaced or
repaired by the manufacturer, their service technician or a similarly-qualified
person in order to avoid the occurrence of a hazardous situation. Do not install
the cables using nails and screws! Connection of the cables must only be carried
out by a qualified person.
• The heating cable must be fed through a Residual Current Device, with a
nominal actuating current of l ∆ n ≤ 30mA. We recommend that every heating
unit/heating circuit should be equipped with an independent Residual Current
Device.
• During operation, the cable must not be exposed to temperatures which are
higher than is set for the individual types.
• The installation must enable the disconnection of the cables at both poles.
• Before the installation and after it, the measurement of insulating resistance
between the heating conductor and the protective braiding must be carried out;
the measured value must not be lower than 0.5 MΩ. Write down the measured
values in the Certificate of Warranty.
• We will carry out a test of cable functionality at full line voltage after completion of
the installation.
• Announce any discrepancies to the producer or supplier immediately and stop all
work.
• Before the use of the heating cable, the label information must be checked to
make sure that they are in accordance with the required product.
• The supplier must inform the other suppliers involved in the construction work
about the placement of the heating unit and about the risks which arise from it.
• Any use of the cable other than what is described in these instructions needs to
be consulted with the producer.
• The shielding of the heating cable must be connected with a protective conductor
according to valid regulations.
• At low temperatures, if the cable is not flexible enough, it is possible to heat it.
The temperature during the installation must not drop under -10°C or -30°C
according to the type of cable.
• The surface where the heating cables will be installed must be clean and free of
any sharp objects.
• The self-regulating heating cables won’t switch off completely, even during
summer temperatures, and so we recommend their regulation with a thermostat.
1. DESCRIPTION AND USE
Description:
The temperature of the self-regulating heating cable is regulated by a resistive
material which is dependent on temperature and which is placed between two
copper conductors. This self-regulation takes place along the whole length of the
cable, in dependence on the surrounding temperature. When the surrounding
temperature decreases, the heating performance of the cable increases and vice
versa. This self-regulation prevents the heating cable from overheating also in the
event of the cables touching each other.
Use:
ELSR – M- 10 – 2- BO and M-15-2-BO
• for the heating of pipes to prevent freezing
Technical parameters:
Supply voltage: 230 V
Max. operating temperature: 65°C
Min. installation temperature: -30°C
Min. radius of bend: 35 mm
A table of lengths and protection of self-regulating cables
Starting temperature
(°C)
+5 °C 6
0 °C 6
-20 °C 6
-30 °C 6
Circuit-breaker with
characteristics C
(A)
10
16
10
16
10
16
10
16
ELSR – M- 10 – 2- BO
Max. length (m)
70
100
110
65
95
105
44
77
90
38
67
90
M-15-2-BO
Max. length (m)
39
60
70
37
58
65
25
44
50
23
41
47
ELSR – N-20-2-AO and N-30-2-AO
• for the technological heating of pipes to a set temperature
• for the defrosting of trays
• for the heating of outside areas (only for placing into concrete)
Technical parameters:
Supply voltage: 230 V
Max. operating temperature: 65°C
Max. temperature of covering layer: 80°C
Min. installation temperature: -10°C
Min. radius of bend: 20 mm
A table of lengths and protection of self-regulating cables
Starting temperature
(°C)
+10 °C 6
0 °C 6
-10 °C 6
-20 °C 6
Circuit-breaker with
characteristics C
(A)
10
16
20
25
10
16
20
25
10
16
20
25
10
16
20
25
ELSR – N- 20 – 2- AO
Max. length (m)
47
93
120
150
187
40
80
94
116
146
34
68
78
96
121
30
60
77
83
104
ELSR – N- 30 – 2- AO
Max. length (m)
29
58
84
105
131
29
58
70
87
109
22
44
61
76
95
20
40
52
64
80
2. USE FOR THE DEFROSTING OF GUTTERS, STANDPIPES AND ROOFS WHERE
THE SNOW CANNOT MELT AWAY FREELY
•
ELSR – N- 20 – 2- AO and ELSR – N- 30 – 2- AO cables installed in gutters and
standpipes provide protection against damage caused by freezing water at
temperatures around 0°C. The heating cables will melt the ice and the water will
be able to flow freely through the gutters and into the standpipes.
•
Cables installed on the roof provide protection in the following cases:
a) when the snow cannot freely slide from the roof into gutters and it accumulates at
anti-snow barriers or in hollows where the roofing is overburdened with accumulating
wet snow.
b) when the snow cannot freely slide from the roof into gutters and the accumulating
water under snow barriers rises through the roof covering and leaks into the building
c) when the snow which is sliding from the roof forms a cornice above the gutter and
doesn’t flow into the gutter spout.
These systems are always combined with the placement of the cable into the gutter
spouts and standpipes.
2. a) Installation
- for smaller spouts and standpipes with diameters of up to 150 mm it is enough to lay
the cables freely, without any further fixing. If more cables are used, we recommend
placing the cables approximately 6 cm from one another; using copper C clamps to
attach them.
- for the passage of the cable from the spout into the standpipe, it is necessary to fix the
cable in such a way that it doesn’t get damaged over the edge of the passage.
2. b) Regulation
As the self-regulating heating cable never switches off completely, not even during high
summer temperatures, it is recommended that the cable be regulated with a thermostat,
or switched off. For example, the regulator EBERLE EM 524 87 + the humidity probe
ESD 524 003 + the temperature sensor TFD 524 004 or a differential regulator,
EBERLE DTR-E 3102, OJ Elektronik ETR/F-1447 A, which is suitable for smaller
applications and well-insulated roofs, can be used for this regulation. The recommended
temperature setting is -5°C to + 3°C.
3. USE OF TEMPERATURE REGULATION TO PROTECT PIPES AGAINST
FREEZING
• Heating cables placed on metal or plastic pipes provide protection against the
freezing of liquids in the pipes when the surrounding temperature is lower then
0°C.
3. a) Dimensioning
The required performance of the cable per 1 m of length can be determined by a
calculation using the following formula:
For the determination of the needed performance of the cable it is necessary to multiply
the heat loss by the coefficient 1.3 and the length of the pipe.
EXAMPLE: a pipe with an inner radius of 25 mm, 13 m long, and insulated with 20 mm
Mirelon needs to be protected against freezing according to the following calculation:
π
Q −
=
λ
d
)(*
tt
pm
2
)(*2
rr
+
down to a lowest surrounding temperature of -20°C (we always consider the nonfreezing temperature to be +5°C).
Interior diameter of pipe
½˝ 15 mm
¾˝ 20 mm
1˝ 25 mm
1¼˝ 32 mm
1½˝ 40 mm
2˝ 50 mm
2½˝ 65 mm
3˝ 80 mm
Pk = Q*1.3*l Pk – performance of the cable
l – length of the cable
Q – heat loss per 1 m of pipe (W/m)
l – coefficient of the heat conductivity of the insulation (W/m*K)
r – radius of the pipe (m)
d – thickness of the insulation (m)
tm – temperature of the medium (°C)
tp – temperature of the environment (°C)
4˝ 100 mm
6˝ 150 mm
8˝ 200 mm
10˝ 250 mm
SOLUTION:
The total wattage of the heating cable must be 171 W or higher. We will use 13 m of self-insulating cable
ELSR – M – M15-2-BO
2
)(*2
rr
+
π
Q −
=
λ
d
π
)(*
tt
= 1.10))20(5(05.0*
pm
+
02.0
2
)025.0025.0(*2
=−−
W/m
Pk – Q*1.3*l = 10.1*1.3*13=170.69 W
3. b) Installation
• The heating cable and the sensor must be attached to the pipe along the whole
length with aluminium self-adhesive tape, which will ensure an even distribution
of heat.
• In the case of the protection of plastic pipes, it is necessary to wind the selfadhesive aluminium tape along the pipe, and wind the aluminium tape around the
whole length of the cable after laying as well.
• After the installation, it is necessary to wrap the whole pipe, including the heating
cables, in insulation.
• During the installation, it is necessary to take into consideration that valves,
connectors and flanges have higher heat loss. Therefore, it is necessary to wind
the cable more densely in these parts.
3. c) Regulation
From the point of view of energy-saving operation, it is necessary to equip the
installation with a thermostat with a distant probe placed on the pipe. From the current
FENIX range, we recommend the KABLOREG A1-4, OJ ETV or EBERLE ITR3.
4. WARRANTY, COMPLAINTS
The supplier of the self-regulating cables provides a warranty of their functionality for a
period of 24 months from the day of their installation confirmed on the certificate of
warranty (the installation must be carried out within a maximum of 6 months after the
date of purchase), if:
• the certificate of warranty and proof of purchase are available,
• the procedure described in these instructions is followed,
• information about the laying of the cable, its connection and the results of the
measurements of the insulation resistance of the heating cable is available.
Any complaint shall be raised in writing with the company which carried out the
installation, or directly with the manufacturer.
Providing that the above-mentioned conditions are fulfilled, and after the expiry of the
warranty period, conditions set in the rules for complaints apply for the period of the
next 8 years, point No. 5.
The rules governing complaints can also be found on http://www.fenixgroup.cz
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