HEATING CABLE TYPE FBTX
Self-regulating heating cable - For frost protection and
temperature maintaining in hazardous areas
This is a parallel resistance, cut to length on site selfregulating heating cable designed for frost protection, process
pipework maintaining and hot water temperature maintaining.
The heating cable adjusts heat output to equal the heat loss
from the pipe work. As pipe temperature falls under no-flow
conditions or due to decreases in external or internal
temperature, output increases. As the pipe temperature
increases under flow conditions or as a result of increasing
external or internal temperature so output decreases.
Construction
The heating cable has a core comprising two bus-wire
conductors contained within an extruded semi-conductive
self-limiting heater core with an outer insulating polyolefin
sheath.
Bus-Wire
Conductors
Semi-conductive
Self Limiting Core
Insulation
Multi Strand Earth
Lead
Foil Earth Screen
Over Jacket (OJ)
The heating cable has an earth protection screen in the form
of a foil jacket covering a multi strand earth lead.
The cable is finished with a further protective thermoplastic
outer sheath over the earth screen.
The heating cable is certified for use in hazardous areas.
Specification
Conductors ....................................... Copper stranded flexible 1.23mm²
Core .................................................. Semi-conductive Polymer
Outer Sheath .................................... Polyolefin
Width ................................................. 10.1mm
Withstand Temp ................................ 80ºC Unenergised 65ºC Energised
Thickness .......................................... 3.2mm
Braid ................................................. Foil jacket with multi strand Earth lead
Over sheath ...................................... Thermo-plastic elastomer
Weight ............................................... 6kg/100m unbraided 7.8kg/100m braided
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
Range
Type
Volts
Watt/m at 10°C
FBTX 10
FBTX 20
FBTX 30
FBTX 40
230
230
230
230
10
20
30
40
Max circuit length (m)
16A CB
177
109
83
57
25A CB
177
129
113
89
Output
70
60
50
Watt/Meter 40
30
20
FBTX40
FBTX30
FBTX20
FBTX10
10
0
-30
-20
-10
0
10
20
30
40
50
60
Temperature °C
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
Heat losses
To calculate heat loss per meter of pipe:
Heat losses W/m = Δt x ke x Loss Factor:
Pipe NB (mm)
25
Δt = Pipe temp. – Ambient temp.
ke = Thermal conductivity
Thermal Insulation Thickness (mm)
38
50
Loss Factor (From BS 6351)
13
25
38
50
75
100
5.16
6.91
8.74
10.28
13.90
17.08
4.13
5.36
6.63
7.69
10.15
12.30
3.58
4.56
5.54
6.36
8.24
9.88
150
23.82
16.82
13.30
Thermal Conductivity (ke) for Mineral/Glass Fiber:
Δt°C
Ke
30
0.034
40
0.035
60
0.036
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