Design Guide for Hazardous / Industrial
Self-regulating trace heating systems
21-1S00-7D0001/-
05/2023-EHT-466853
Notice Technical data subject to change without notice.
No claims for damage arising from alternations, errors or misprints shall be allowed.
Notes
* Limitations may apply to the trace heater circuit length, in order not to exceed the maximum allowed operating current (steady state). Consult
the manufacturers trace heating system design documentation, containing the calculated operating current of the applicable trace heating circuit.
** PBTW is limited to use in trace heating circuits protected by a 16 A rated over current protection, see electrical data above.
# Maximum surface temperature of installation enclosures:
- with trace heaters installed and operating (with steady state operating current);
- with the installation enclosures positioned in the worst case orientation with maximum amount of accumulated dust layer (limitations to the ori-
entation of installation do not apply).
## Maximum sheath temperature trace heater, installed on workpiece.
### System comprising installation enclosure and trace heaters.
Trace heater Installation Enclosure as End of Line Light kit and End of Line Seal kit
Junction box with mounting stand
Max. workpiece temperature
mounting stand
3
Spring clamp Ex e: 1x3 PE
ComEx Lamp module
Spring clamp Ex e: 1x3 PE
ComEx Lamp module
Max. power conductor size
Trace heater bus wires only
Maximum circuit breaker size:
6
Ambient temperature range
Min. installation temperature
Connection Technology (CAK)
Maximum withstand temperature /
max. service tem-perature end seal
Min. installation temperature
ESTM Temperature Controller
Workpiece temperature
range
7
Spring clamp
0,5 mm² to 4 mm²
Spring clamp
Power cable 6 mm², Control cables 2.5 mm²
Maximum circuit breaker
size
8
Ambient temperature range
Min. installation temperature
Minimum Temperatur re-
sistance of supply cable
9
PSB:
+80 °C for system in T5
+75 °C for system in T6
MSB:
+125 °C for system in T3
+95 °C for system in T4
Sealing area supply cables
9 mm to 16 mm (for types 27-59P1…/…)
12 mm to 17 mm power cable
5 mm to 8 mm control cable
IP 65
IP 66, IP 68 (EN 60529)
Protecting of all components of the branch circuit against over-current; choice depending on design parameters
Observe Technical Data of the Heating Cable
Protecting of all components of the branch circuit against over-current; choice depending on design parameters
For supply cable type selection, the permissible operating temperature at the conductor is to be observed with respect to the maximum ambient temperatue of the product