Choosing type of cable

Choosing type of cable
Type of cable Switched on Switched off
SELF-LIMITING
SRL
SRM
65°C
120°C
85°C
190°c
PARALLEL RESISTIVE
CWM
120°C 200°C
SERIES RESISTIVE/TEFLON INSULATED
TCT/TCTR
Depending on load 200°C
MINERAL INSULATED
COPPER
COPPER-NICKEL
ROSTFRI*
Depending on load
Depending on load
Depending on load
250°C
450°C
600°c

* In environments saturated with salt can stainless cables corrode with short-circuiting as a result.

Example

Environment = Exposed to moisture
Voltage = 230 V
Pipe material = Metallic
Tp = 65°C
Toperation = 40°C
Required power = 10 W/m
  1. Both temperatures are below the maximum temperature data for all cable types (all cable types can be used).
  2. SRL -5- gives 10 W/m at 40°C.
  3. EST/CWM 12-4 gives 10 W/m cable at 230V
  4. Series resistive cables, see choosing cable type

If required running meter output not can be obtained

Possible steps:

  • Coil or lay several runs with cables.
  • Increase the thickness of the insulation or choose insulation with better k-value.
  • Choose any of our miscellaneous heating products (for example silicone element or nozzle heaters)