Raychem EM4-CW Installations- Und Betriebshandbuch Seite 9

Spacing
Arrange the spacing (S) of the heating
cable as shown:
Area to be heated
Preparing sub-surface
The heating cable should be installed
on a stable subsurface. In suspended
structures the substratum may consist
of finished slabs, prestressed concrete
or a suspended structure with poured
concrete. The heating cable can be
laid on all sub-surfaces. In the case of
Cable resistance and insulation resistance test
Testing the heating cable involves the
measuring of the conductor resistance
and the cable electrical insulation
resistance.The conductor resistance is
Cold lead
Conductor
For standard slab constructions:
S = 8-10 cm for concrete
Notes:
S/2
• Keep at least 5 cm away
S/2
from obstructions
S
• Avoid the sites of future
penetrations (such as drains)
poured concrete, it should be ensured
that the surface is smooth and all
sharp objects are removed. Ramps on
a solid substratum do not require any
additional thermal insulation. Appropriate
preparations should be made for installing
the temperature and moisture sensor.
measured with an ohmmeter. A deviation
of up to 10% from the nominal resistance
is permissible. See table on page 5.
Record all the measured
values on the Installation
Test Record provided.
Ohmmeter
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