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FI
The insulation resistance should be measured with the aid of a 2500 Vdc (500 Vdc minimum) insulation resistance tester.
The reading should be more than 100 MΩ. Record all the measured values on the Installation Test Record provided.
Heating cable installation
Keep connection end of cable dry before and during installation.
All connections and electrical testing should be carried out by a qualified electrician.
•
The heating cable should be separated from other heat sources such as luminaries and chimneys.
•
Minimum bending radius of the heating cable while laying shall not be less than about six times of the
cable diameter.
•
Allow sufficient drying or the curing period of the concrete/asphalt after installing the heating system and
before energizing the heating system.
•
Never alter the heating cable length in any circumstances
•
Never provide power supply in reel form of the cable and roll form of the mat.
•
Do not use excessive force to pull the cold leads otherwise it may damage the hot-cold splice.
The heating cable should not be:
•
cut or damaged,
•
installed across expansion joints or separate concrete slabs.
Minimum cable spacing is 10 cm
The heating cable must be secured to the underlying surface to prevent movement during the installation.
The cold lead cable should be protected in a conduit. The entire length of heating cable should be covered by wet
sand-cement mixture, screed, or dry sand or asphalt depending on the selected top surface.
Ramp heating embedded in concrete / cement screed / asphalt
Concrete / Cement
screed ground
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14
nVent.com/RAYCHEM
Cold lead
Conductor
100 mm for
300 W/m²
WinterGard Cable
Approx 50 mm thickness
of concrete / compacted
substrate
Insulation resistance tester
Temperature and
moisture sensor
Soil
50 mm min.
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