Constant Wattage cable
Constant Wattage cable Constant Wattage Heating Cables Typical Characteristics of product range Available for hazardous area applications – Zone 1 & 2 Maximum Application Temperature to 425C Maximum Circuit length – 200m Cut to Length Cable cannot be crossed on itself without potential over temperature damage. These types of cables differ in the construction to self-regulating cables and in operation. In this construction the two bus-wires are extruded with an insulating layer over each conductor. At pre-determined distances, the insulation is removed from alternate conductors, exposing the base conductor. A heating wire (or element) is wrapped around the two conductors, and where the wire meets these two areas, a heating ‘zone’ is created. A layer of insulation is then extruded over the cable. Similar to the self-regulating cable, a further optional layer of metallic braid and a final thermoplastic or fluoropolymer insulation can be extruded over the cable to provide a finished product. The heating element used has a very low alpha coefficient. This means that the resistance of the element is very uniform regardless of the temperature. The advantages of constant output cables are that start-up currents are negligible. A disadvantage is that the cable must not be crossed upon itself as hot spots may occur. Our Range Includes: OBCW – Freeze Protection and Temperature Maintenance Output Wattage range (w/m) 10,20,30,40 Maximum maintain temperature (energized) 10 w/m 150°C Maximum maintain temperature (energized) 20 w/m 120°C Maximum maintain temperature (energized) 30 w/m 90°C Maximum maintain temperature (energized) 40 w/m 65°C Maximum exposure temperature (de energized) 205°C Minimum installation temperature -40°C Working voltage range 110V- 120V / 220-240V HCW – Freeze Protection and Temperature Maintenance Output Wattage range (w/m) 10,20,30,40 Maximum maintain temperature (energized) 10 w/m 150°C Maximum maintain temperature (energized) 20 w/m 120°C Maximum maintain temperature (energized) 30 w/m 90°C Maximum maintain temperature (energized) 40 w/m 65°C Maximum exposure temperature (de energized) 205°C Minimum installation temperature -40°C Working voltage range 110V- 120V / 220-240V