Constant wattage heating cable delivering a specific wattage per metre; used on pipelines, floors and tank surfaces.
Also known as: Heating cable · Heating tape · Constant wattage heating cable · Resistance heating cable
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General Information
Heating cables are constant output heaters that distribute power evenly over long distances. The inner conductor is resistance wire, covered with high-temperature insulation, then a metal braid shield and an outer jacket. Frost protection of pipelines, keeping tank surfaces warm and floor heating are typical applications.
The critical rule in this product group is this: a constant wattage cable must never be wound overlapping itself. At crossing points the power per unit area doubles, the cable cannot dissipate its own heat and the insulation melts. Winding must always be spaced and in a single layer, with the required total power set by the winding pitch.
The shielded construction serves two purposes: it provides mechanical protection and creates an earth path, allowing use with a residual current device. Residual current protection is mandatory in wet or outdoor applications. For temperature control, a thermostat or sensor placed on the pipe surface is used.
Applications
- Pipeline frost protection
- Tank surfaces
- Floor heating
- Valves and fittings
- Mould heating
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Frequently Asked Questions
No. With constant wattage cable, power doubles at crossing points and the insulation melts. Winding must be single-layer and spaced, with the required power set by the winding pitch. If overlapping is necessary, self-regulating cable should be used.
No. The resistance of constant wattage cable is calculated according to its length; if shortened, resistance drops, current increases and the cable burns out. The length you need must be specified when ordering.
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