ELEKTRA VCDR User manual

E
Protection of gutters, downpipes
and roofs against snow and ice
C
Characteristics
ELEKTRA VCDR
heating cables
The ELEKTRA VCDR heating cables meet the requirements of
EN-60335-1 and EN 60335-2-83 standards. They are manufactured as
2 core cables (single-sided power supply), with a power rating of 20 W/m,
finished with a 4m cold cable. The heating cables and power supply cables
are coated with a UV-resistant material.
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A
Advantages
S
Selection
ELEKTRA VCDR heating cables prevent:
Water freezing in gutters and downpipes and also prevent damage
to these systems
Accumulation of snow and ice on roofs
Development of seepage on facades of buildings
Development of icicles
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To insure effective operation of a heating system, the installed power must be
design.
Also most important thing is to take under consideration the location of the facility in
the climate zone, the diameter of downpipes and influence of the wind.
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T
Technical data
m W-
TYPE LENGTH POWER
TABLE 1 Technical data of VCDR20 cables
Other types available on special order.
The rated supply voltage of the cables is 230V; 50/60 Hz.
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VCDR 20/190 9.5 190
VCDR 20/235 12.0 235
VCDR 20/330 16.5 330
VCDR 20/380 19.0 380
VCDR 20/520 26.0 520
VCDR 20/600 29.0 600
VCDR 20/800 40.0 800
VCDR 20/1000 50.0 1000
VCDR 20/1140 57.0 1140
VCDR 20/1300 65.0 1300
VCDR 20/1560 78.0 1560
VCDR 20/1720 86.0 1720
VCDR 20/2050 102.0 2050
VCDR 20/2360 118.0 2360
VCDR 20/2710 135.0 2710
VCDR 20/3000 150.0 3000
VCDR 20/3450 175.0 3450

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Installation in gutters
and downpipes
First Steps:
Measure the lengths of gutters and downpipes
Determine the unit heating power
Select appropriate cable length according to Table 1
When calculating the heating cable lengths take the following
into consideration:
If the calculated heating cable length does not have an exact
equivalent specified in Table 1, you can select a longer heating cable
and place the additional section in the gutter
You can select two heating sets, one set for the gutter and a separate
set for the downpipe
If the water from downpipes is drained directly into the sewage
system, then the section of the drainage pipe from ground level
to the frost penetration depth must be heated
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Examples of installation of the VCDR20 heating cable in a gutter
and downpipe
Single VCDR20 heating cable in a gutter
and downpipe assures the power of
20 W/m.
Double VCDR20 heating cable in the
gutter and downpipe assure the power
of 40 W/m.
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Double VCDR20 heating cable in the gutter
(40 W/m) and single cable in the downpipe
(20 W/m)
60 W/m of heating power in the gutter
– triple cable, and 40 W/m in the downpipe
– double cable
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Gutter spacing clip
Heating cables installed in a gutter
using the clips
Installation of heating cables in gutters
The following elements are used for installing heating cables in gutters:
Clips
ELEKTRA TMS installation tape
Gutter and downpipe spacing steel cord with clips
The mounting elements enable durable installation and maintaining uniform
distances between the heating cables. The distance between the clips or ELEKTRA
TMS tape sections must not exceed 40 cm.
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Spacing steel cord with clips
Heating cables installed in a gutter
using the spacing steel cord with clips
ELEKTRA TMS installation tape
(standard tape length – 10 m)
Heating cables installed in a gutter using
the ELEKTRA TMS tape
In climate zones and in areas with
heavy snowfalls the heating cables in
the gutter must be installed using
spacing steel cord with clips.
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Installing the heating cables in downpipes
The following heating cable installation methods can be used for downpipes:
1. When installing a single heating cable, the cable can be placed freely in the
downpipe without any mounting elements. However, the length of the downpipe
must not exceed 6m. Otherwise, heating cable sections must be fixed to
a steel cord or chain of similar strength. The supporting wire can be fixed to the
building structure or any steel element (rod, flat bar) installed directly over the
downpipe inlet.
2. When installing a double cable, use clips or ELEKTRA TMS installation tape to
install the cables. These mounting elements will assure maintaining a uniform
distance between adjacent sections of the cable. The distance between clips or
sections of installation tape must not exceed 40cm.
Downpipe spacing clip
Heating cables installed inside
a downpipe using sapcing clips
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Heating cables installed in a gutter using
the ELEKTRA TMS tape
If the downpipe length exceeds 12m,
use spacing steel cord with clips to
install a double heating cable.
Connection of gutter
and downpipe must be
secured with a stainless
flat bar in order to pre-
vent possible damage to
the heating cable.
Installation of heating cable below the
ground level
If the water from downpipes is drained
directly into the sewage system, then
the section of the drainage pipe from
ground level to the frost penetration
depth (approximately 1.0m) must be
heated.
ELEKTRA TMS installation tape
(standard tape length – 10m)
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Downpipe spacing steel cord with clips