TCPR

TCPR

VELOX TCPR SERIES RESISTIVE, WITH RETURN WIRE
tcpr-number
  1. Sheath PVC
  2. Metallic screen
  3. Ground wire
  4. Return wire
  5. Conductor with teflon insulation

Area of use

  • Frost protection – Temperature maintenance of piping and tanks. Interior and exterior installation in pipings.
  • Floor heating – Concrete, thin floors and wooden joists.
  • Surface heating – Non-slippery walk- and drive areas.
  • Roof applications – Frost protection of gutters and drain pipes and melting of roof surfaces.

Cable data

Electric field strength not measurable cable< 3 Vm
Magnetic field strength not measurable cable < 0.06 micro Tessla

Basic type 90 CM acc. to IEC800
Tested and approved by SEMKO (Sweden) • SETI (Finnland) • NEMKO (Norway)
Meets requirements from VDE (Germany) • BS (England) • DEMKO (Denmark)
Rated voltage 440 V
Sheath temperature (Tm) max +90°C
Process temperature
– Cable off		 (Tp)
(TpOff) max +90°C
Installation temperature min -10°C
Bending radius min 25 mm
Diameter 5.5 ± 0.5 mm
Weight 92 kg/1000m
Table 1: Resistance values

Type of cable (Ω/m) Temperature
Coefficience		 Part.no
12.00 0.04 18812R
8.00 0.15 18800R
4.00 0.40 18400R
2.90 0.40 18290R
1.90 0.40 18190R
1.30 0.14 18130R
1.00 0.14 18100R
0.82 0.14 18082R
0.65 0.14 18065R
0.45 0.25 18045R
0.36 0.25 18036R
0.25 0.40 18025R
0.18 0.70 18018R

Sheath temperature/Dimensions

Sheath temperature

The sheath temperature (Tm) of the cable will vary depending on the process (ambient) temperature (Tp), load (Q) and way of installation.

The sheath temperature is calculated as follows:

Tm = Q / Ua + Tp

Tm = Sheath temperature in °C
Tp = Process temperature in °C
Q = Load in W/m
Ua = Heat transfer coefficience

Example:

Velox TCPR mounted without dissipation of heat at an ambient temperature of 25°C, loaded with 20 W/m will have a sheath temperature of 65°C.

Installation in sand, concrete and asphalt

Sand: max. load 20 W/m cable.
Concrete: max. load 25 W/m cable.

Sheath temperature: diagram 1

Cable installed free in air or against heat conducting material (Ua = 0.45)
Read the diagramme from right to left (see example = yellow line)

tcpr-diagram

Dissipation of heat

The heat transfer coefficient (Ua) can be improved considerably (3 to10 times) by arranging some dissipation of heat, for instance by providing the cable with aluminium tape.

For this kind of installation please consult VärmeKabelTeknik for assistance with the design and installation.