ELEKTRA SelfTec PRO 10, Installation Manual

Page: 12 / 108

∆ T – difference of ambient temperature and required agent temperature
(e.g. water) inside the pipeline
For losses smaller than e.g. 10 W/m, assume 10 W/m.
For protection of valves, elbows, T-joints or flanges, it is required to add
extra approx. 0.5 m of the heating cable per each element.
Protection of gutters and downpipes against
snow and ice deposition
In the systems of protection against snow and ice deposition, self-regulating
®
ELEKTRA SelfTec PRO 20 and 33 heating cables are applied which prevent:
• snow and ice deposition on roofs,
• water freezing in gutters and/or downpipes,
• formation of damp patches on building facades,
• formation of icicles.
To ensure max. effectiveness of operation of the heating system, heating
power value needs to be assessed depending from local climatic conditions
(i.e. min. ambient temperature, snowfall intensity and wind operation).
Recommended heating power values are given in table 4:
12
Installation Manual Self-regulating Heating Cables
® ELEKTRA SelfTec PRO
=
pipeline heat losses
(according to table 3)
heating cable power
(10, 20, 33 W/m)
x
lenght of
the heating cable
lenght of
the pipeline