Raychem EM4-CW Installations- Und Betriebshandbuch Seite 11

Ramp heating with top layer of stone or paving slabs
EM4-CW-Cable
60-80 mm
30-50 mm
Sand bed
Ramp heating embedded in concrete / cement screed
Top layer asphalt
Concrete / cement
screed ground
If the heating cable can not be fixed to a reinforcement mesh, the installer should use
the plastic spacer or other fixing method to keep the cable spacing consistent.
Slab preparation & reinforcement
• In the case of a concrete slab, the
mesh or reinforcement bar must be
adequately supported so that it is not
disturbed during the concrete pour.
• The reinforcement must be positioned
so that the heating cable will be 50 mm
below the surface of the concrete.
• The reinforcement must be positioned
at the correct distance below the
surface of the concrete to within
± 1 cm.
• Where mesh is used, it must be strong
enough that it will not "droop" when
walked on for the installation of the
heating cable. Use a mesh grid of at
least 50 mm. A grid spacing of 100 mm
is most practical.
80-100 mm for
250-300W/m
80-100 mm for
250-300W/m
EM4-CW-Cable
Concrete / compacted
substrate
2 Temperature and
moisture sensor
Soil ground
Asphalt layer Temperature and
2
25 mm moisture sensor
• Where a reinforcement bar is used,
arrange its spacing to match the
requirement of the heating cable
spacing.
Surface of concrete
50 mm
minimum
Reinforcement support
20-30 mm
Stones / paver
(max. 8 cm)
50 mm
Soil
Heating cable
Mesh
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