HEATING CABLE TYPE VC
Parallel circuit heating cable - Constant watt
Parallel circuit heating cable is 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.
Bus-Wire
Conductors
Insulation
Soldered Joint
Each complete heating zone will give its full rated design
output with circuit voltage applied to the bus-wire conductors.
Usage
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).
Construction
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.
Nichrome resistance wire is wrapped at regular spacing
around. The core as a continuous conductor, making contact
with the bus-wires at the exposed points.
Heating Element
Sheath
Earth Braid
Over Jacket (OJ)
(Optional)
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.
IHP International Heating Products AB
Page 1 of 3
_________________________________________________________________________________________________________________
Industrivägen 2, SE-433 61 Sävedalen, Sweden
Phone: +46 (0)31 795 30 30 - Fax: +46 (0)31 795 30 39
Website: www.ihp.se - E-mail: info@ihp.se - Org. No. 556689-7327 - VAT No. SE556689732701
Bank: SEB Skandinaviska Enskilda Banken AB - F-Tax licensed
Specification
Conductors ........................................ Copper stranded flexible 30/0.25mm (1.5mm²)
Core ................................................... Silicone rubber
Heater element ................................. Nickel/chrome 80/20
Solder ................................................ High melting point 296°C
Outer Sheath ..................................... Silicone rubber
Width ................................................. 9.75mm
Thickness .......................................... 5.25mm
Heater zone ....................................... 0.5 or 1m according to design output
Braid .................................................. Stainless steel/Plated copper
Temperature ...................................... Min. -60°C – Max. +200°C
Standard ............................................ BS EN 62395-1:2006
Min Bend Radius ............................... 50mm
Range
Type
Volts
Watt/m
VC 8
VC 12
VC 16
VC 20
VC 8
VC 12
VC 16
VC 20
VC 30
VC 38
110
110
110
110
240
240
240
240
240
240
8
12
16
20
8
12
16
20
30
38
Heater zone
Length (m)
1.0
1.0
0.5
0.5
1.0
1.0
1.0
1.0
1.0
1.0
Max circuit
Length (m)
110
88
82
76
275
187
154
132
116
98
Max recommended
Pipe Temp ºC
190
175
160
145
190
175
160
145
100
90
Electrical
Heater
Zone
Heater
Zone
Insulated
Bus-wire
end
Rated
Voltage
Rated Voltage – 220V/240V or 110V/120V AC/DC.
Heater Zone (according to design) – 0.5/1.0m.
IHP International Heating Products AB
Page 2 of 3
_________________________________________________________________________________________________________________
Industrivägen 2, SE-433 61 Sävedalen, Sweden
Phone: +46 (0)31 795 30 30 - Fax: +46 (0)31 795 30 39
Website: www.ihp.se - E-mail: info@ihp.se - Org. No. 556689-7327 - VAT No. SE556689732701
Bank: SEB Skandinaviska Enskilda Banken AB - F-Tax licensed
A 30mA trip Residual Current Circuit Device (RCCB) or Earth Leakage Circuit
Breaker (ELCB) is recommended for use with heating cables.
Heat losses
To calculate heat loss per meter of pipe:
Heat losses W/m = Δt x ke x Loss Factor
Pipe NB (mm)
13
25
38
50
75
100
150
Δt = Pipe temp. – Ambient temp.
ke = Thermal conductivity
Thermal Insulation Thickness (mm)
38
Loss Factor ( BS 6351)
4.13
5.36
6.63
7.69
10.15
12.30
16.82
25
5.16
6.91
8.74
10.28
13.90
17.08
23.82
50
3.58
4.56
5.54
6.36
8.24
9.88
13.30
Thermal Conductivity (ke) for Mineral/Glass Fiber:
Δt°C
Ke
30
0.034
40
0.035
60
0.036
80
0.037
100
0.038
120
0.040
140
0.042
160
0.044
To comply with BS 6351 allowance should be taken of maximum heater resistance
tolerance (± 10%) and voltage variation (± 6%) = 1.1 = 1.25 x Heat Loss.
(0.94)²
A further design factor of 10% may be added.
IHP International Heating Products AB
Page 3 of 3
_________________________________________________________________________________________________________________
Industrivägen 2, SE-433 61 Sävedalen, Sweden
Phone: +46 (0)31 795 30 30 - Fax: +46 (0)31 795 30 39
Website: www.ihp.se - E-mail: info@ihp.se - Org. No. 556689-7327 - VAT No. SE556689732701
Bank: SEB Skandinaviska Enskilda Banken AB - F-Tax licensed