>> VC Heating Cable a parallel circuit heating cable designed to be cut from reel lengths and site terminated to suit pipe work. The heating cable consists of a number of short heating zones, each connected across a pair of continuous bus-wire conductors.
Each complete heating zone will give its full rated design output with circuit voltage applied to the bus-wire conductors.
Suitable for internal and external freeze protection and temperature maintenance, hot water lines, oil and chemical lines, sprinkler system mains and supply piping (as listed in Clause 1 BS EN 62395-1:2006).
The heating cable has a core comprising two bus-wire conductors contained within an extruded silicone rubber sheath. The sheath is notched on alternate sides at predetermined intervals to expose a short section of bus-wire conductor.
Nickel-chrome resistance wire is wrapped at regular spacing around. The core as a continuous conductor, making contact with the bus-wires at the exposed points.
After completion of the heater conductor wrapping, a high temperature soldered joint is made at each contact point ensuring that a number of conductor strands are securely bonded to the bus-wires.
An extruded outer sheath of silicone rubber is then placed over the core and heater element to complete the heater cable assembly.
Where additional protection is required for corrosive conditions extruded silicone rubber sheathing can be placed over the braided cover.
|Conductors||Copper stranded flexible 30/0,25mm (1,5mm²)|
|Heater element||Nickel-chrome 80-20|
|Solder||High melting point 296°C|
|Outer sheath||Silicone rubber|
|Width||10mm (Braided version)|
|Thickness||5,25mm (Braided version)|
|Temperature range||-60°C to +200°C|
|Standard||To BS EN 62395-1:2013 Clause 1|
|Min bend Radius||15mm|
|Type||Volts||Watt/m||Heater zone length (m)||Max circuit length (m)||Max recommended
pipe temp ºC
A 30mA trip Residual Current Circuit Device (RCCD) or Earth Leakage Circuit Breaker (ELCB) is recommended for use with heating cables.
To calculate heat loss per meter of pipe:
ke = ThermalConductivity of insulation layer at its mean temperature
Tp= Maintain Temperature
Ta= MinimumAmbient temp
D1= Inside diameter of theinsulation layer
D2= Outsidediameter of the insulationlayer
|Mean temperature °C||10||50||100||200|