SERIES RESISTIVE HEATING CABLES
The first heating cable that was produced was of a series resistive type. Today there are several types series resistive heating cable available. These are manufactured in qualities from PVC to mineral insulated high-temperature cable with rustless sheath. The biggest advantage with these is the possibility to obtain long element lengths, from only one point of connection.
CONSTANT WATTAGE CABLES
Parallel resistive cables can be bought as running metre for making-up on the site. This admits a good flexibility both at new production and repairs. The cable has a constant output per metre irrespective of length and temperature and can be cut on regular distances, most often between 0.5 – 1.2 metres dependent on module lengths from different suppliers.
SELF-LIMITING HEATING CABLE
Self-limiting heating cables can be bought in running metre for make-up on the site. The cable has a varying output depending on the ambient temperature, which guard against overheating even if the cables crosses themselves. This also allows installation in Ex-surfaces (all VärmeKabelTekniks self-limiting heating cable types are Ex-rated).
VÄRMEKABELTEKNIKS CABLE PRODUCTS CHARACTERISTICS – INDUSTRIAL CABLES
MAXIMUM CABLE TEMPERATURE
Heating cables has a limited max. temperature in consequence of the material which is used at their construction. If the temperature exceeds recommended values, the lifetime is shortened or at worst the cable is destroyed.