Thermon KSR - Manual (Page 5)

4
KSR for Snow Melting Under Asphalt Paving . . .
The following information is in addition to the standard
installation guidelines and testing recommendations included
in the KSR Installation Instructions.
With a maximum exposure temperature rating of 350°F
(177°C), KSR cables can usually withstand the temperatures
encountered during asphalt placement. Once it is verified that
the asphalt application temperature is consistent with the KSR
cable temperature rating, a structurally sound base should be
in place for the heater cable attachment.
There are two recommended methods of attachment for
asphalt installations: (1) a mesh is secured in place over the
existing base and the cable is attached to the mesh with non-
metallic ties or tape suitable for the asphalt temperature (such
as 3M 69 tape), or (2) anchor bolts are secured to the existing
base and the cable is attached to the anchors with non-metallic
ties or tape. After the cables are secured in place and tested
(Cable Testing Report Form), the asphalt should be spread
manually over the cables, approximately 2" thick minimum
then rolled with a hand roller.
Design Note 1 : for installation in asphalt, the output of KSR
cables should be derated by a factor of 0.9, resulting in the
following KSR Cable Spacing chart modifications:
Design Note 2 : Local regulations and codes should always
be reviewed in advance for additional requirements; for
example, CSA approvals for heating cables embedded in
asphalt have a maximum spacing of 6"..
KSR for Snow Melting Under Paving Stones . . .
The following information is in addition to the standard
installation guidelines and testing recommendations included
in the KSR Installation Instructions.
When installing KSR cable under paving stones, care should
be taken to ensure the cables are secured in place between
two layers of sand below the pavers. For typical 1-1/2" to 2"
thick paving stones, the first sand layer should be 1-1/2" thick
with the cable secured in place on top of this layer.
Do not use metallic tie wire to secure the cable in place.
Another layer of sand, 1-1/2" thick, should be layered on top
of the cable prior to placement of the pavers.
Please contact Thermon for additional information and design
assistance.
Snowfall Severity
KSR Cable
Spacing in Asphalt
Category Rate of Snowfall Noncritical Critical
Light 1/2" per hour 10" 6"
Moderate 1" per hour 8" 5"
Heavy 2" per hour 6" 5"
KSR Cable Spacing in Asphalt
Please contact Thermon for additional information and design
assistance