Installation Manual

37
ElectroMelt System
Design Guide
Condensed
Specification Guide
This is the product portion of a specification for the ElectroMelt System. For a
complete specification that includes installation and testing recommendations,
contact your Raychem representative.
PART 1 - GENERAL
Furnish and install a UL Listed and CSA Certified snow-melting system com-
plete with heating cable, termination components, junction boxes, contactors,
and controls.
PART 2 - PRODUCTS
2.1 The heating cable and termination components shall be UL Listed as De-
icing and Snow-melting Equipment and CSA Certified as Designation 1B, 2B.
2.2 The heating cable shall consist of two 14-gauge nickel-coated-copper bus
wires embedded in parallel in a self-regulating polymer core. Power output
shall vary in response to temperature all along its length, allowing the heat-
ing cable to be crossed over itself without overheating, to be cut to length in
the field, and to have no heater-to-cold-lead connections buried in the
pavement. The heating cable shall be covered by a crosslinked dielectric
jacket and protected by a tinned-copper braid and a 70-mil-thick modified
polyolefin outer jacket.
2.3 The heating cable shall be of parallel circuit construction to allow the cable to
be spliced if it is inadvertently cut during or after construction, and to be pow-
wered from both ends if it becomes advantageous to divide a circuit in two.
2.4 The heating cable shall operate on (select: 208, 220, 240, or 277) volts
without the use of transformers.
2.5 The heating cable shall be ElectroMelt EM2-XR as manufactured by
Raychem Corporation.
2.6 The system shall be controlled by (select: a switch, an ambient sensing ther-
mostat, or an automatic snow controller) through an appropriate contactor.
2.7 The heating cable power connection and end seal terminations shall be
made in an ElectroMelt EMK-XJB junction box.
2.8 Each circuit shall be protected by a 30-mA ground-fault protection device.
PART 3 - INSTALLATION
3.1 The heating cable shall be installed according to the manufacturer's recom-
mendations, the instructions supplied with the heating cable and compo-
nents, and the instructions in the ElectroMelt Installation and Operation
Manual (H53392).
3.2 The heating cable shall be installed only in concrete pavement designed for
long-term structural integrity. The pavement shall be reinforced with rebar
or wire mesh and the reinforcing supported such that the location of the
reinforcing and the attached heating cable is not disturbed during the con-
crete placement. The rebar shall be placed at the heating-cable depth
whenever possible.
3.3 The heating cable shall be protected from where it leaves the pavement to
the junction box by installing the cable in 1-inch rigid metal conduit. Use
one conduit for each heating cable.
3.4 The power connection and end seal junction box shall be mounted above
grade. The junction box shall be installed so that water can not enter it.
3.5 Heating-cable repairs and splices shall be made using a splice kit provided
by the manufacturer and specifically approved for the purpose. They shall
pass the Megger test after installation.
PART 4 - TESTING
The heating cable shall be tested for insulation resistance with a 2500-Vdc
Megger after installation, during the concrete pour, and annually thereafter
according to the manufacturer's recommendations and following the instruc-
tions provided in the ElectroMelt Installation and Operation Manual (H53392).