King Electric SCM - Manual (Page 11)

11
Prepare the base material
Prepare the site that you want to heat with the SC/SCM cable/mat. This includes making sure all utilities and obstructions are accounted for.
Lay a smooth, well-compacted gravel base. Ensure proper slope and drainage to avoid water buildup in any heated or surrounding areas. This
is especially important for brick paver applications, as melted water may re-freeze and heave surrounding sand and paver areas. Follow local
building code and construction guidelines for grade thickness and type.
Make sure you account for the total grade and slab thickness as required for pedestrian and vehicular traffic use. If the cable/mat is to be
placed on an existing pavement, make sure it is inspected for any sharp objects, loose sections, or other potentially damaging issues that could
cause problems later. It is very important for the cable to be completely embedded.
Prepare to install
Determine a time to install the cable/mat when equipment, heavey tools, and site traffic will be minimal to keep from possibly damaging the
product. Be prepared to apply the surfacing courses over the cable/mat the same day so it will be protected from damage.
If installing cable/mat in the upper layer of a two-stage concrete slab or the upper layer of an
asphalt application, the cable or mat should be completely ready for the stage. There is limited
time between stages, as the slab should not be allowed to fully cure or the asphalt to
completely cool. Therefore, if using SC/SMC cable, you may want to lay it out and tie it to
rewire that can be quickly lifted into place after the first is laid. This might also be preferable for
a mat installation, although if mats are precut and shaped to the area, they generally can be
rolled into place fairly quickly. If a slab sensor is installed in the second layer, plan ahead so
this does not cause the first layer to cure or cool too much.
Inspect the area and remove any sharp objects. Install in temperatures at least 40 degrees F
(4.5 degrees C)
Begin by test-fitting the cable or mat in the area to be heated
For mat, unroll it completely. Turn and flip it by cutting the tape where needed. Make sure it fits the area properly. For cable, make sure it fits
the area with no excess cable.
Important Cable CANNOT be cut shorter to fit. Do not overlap or cross over heating cable on itself. Do not space heating cable closer than 2”.
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Cable/mat cannot be laid closer than 6 inches from the edges of slabs. In asphalt, no closer than 12” from the edge where no curb.
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Avoid crossing expansion joints in a slab, unless proper technique and protection steps are followed
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Avoid placing the heating cable any closer than 2” from other items such as underground cable or piping to keep from overheating
them.
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Allow at least 2”, but not more than 4”, between adjacent mats or sections of a mat where the mat tape is cut and turned to fill the
area.

Do not repeatedly bend the heating cable, and never bend factory splices.
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Place the power leads of the cable/mat next to the conduit entry. The electrician will pull this through the conduit later. Make sure it is
positioned so that the no part of the splice connection or the heating cable will be pulled into the conduit.
The heating cable and factory splices of the SC/SCM cable/mat must be completely embedded in the concrete, sand, or as-
phalt. Never try to use up excess cable in surrounding soil, walls, or other unprotected applications.
SAVE THESE INSTRUCTIONS
INSTALLATION INSTRUCTIONS
! WARNING