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ISK Flexible resistance heating cable

ISK Flexible resistance heating cable

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Flexible resistance heating cables ISK are used where the length of the circuit exceeds the maximum length of self-regulating heating cables. ISK resistance heating cables resist the steam flushing temperatures. They are used to hold the temperature on long pipes or to protect against frost.
The ISK serial circuit provides constant power over the entire length of the cable without a voltage drop. Glass ceramic tape increases cable protection and fluoropolymer ensures chemical resistance while maintaining maximum flexibility.
ISK cables are approved for use in normal environments, zones 1, 2 and zones 21, 22.

The power output limitation of the ISK cables is due to the designed maintained temperature. We are able to ensure that the temperature class given by the stabilized design allows ISK cables to operate in a potentially explosive environment without limiting thermostats. Power and temperature class of ISK cables depends on supply voltage, cable resistance, cable length, temperature conditions and other variables.
Contact GENERI, s.r.o.


Cable termination:
One ISK heating cable requires 2pcs of cold end and 2pcs of connectors between the heating cable and the cold end. For correct selection of termination sets contact GENERI, s.r.o.

Size and type of circuit breaker:
The maximum circuit lengths depend on the conductor resistance per meter. The size of the circuit breaker and the type of short circuit protection used must be designed according to national standards. For design information and other supply voltages please contact GENERI, s.r.o.
Short-circuit protection must be provided for each supply branch of the heating system separately.

1. Temperature classes are according to internationally recognized standards of authorized institutions.
2. ISK heating cables are approved for temperature classes using a stabilized design. This makes it possible to use cables in
     explosive atmospheres without limiting thermostats. For design
of heating circuits, please contact Generi, s.r.o.


 Type of cable  Conductor resistance
(Ohm/km at 20 °C)
 Cable diameter
 ISK 1R08 7PFF-H  1,08  10,20
 ISK 1R71 7PFF-H  1,71  8,60
 ISK 2R90 7PFF-H  2,90  7,60
 ISK 4R40 7PFF-H  4,40  6,70
 ISK 7R20 7PFF-L  7,20  4,94
 ISK 0010 7PFF-L  10,00  4,75
 ISK 11R7 7PFF-L  11,70  4,60
 ISK 0015 7PFF-L  15,00  4,42
 ISK 17R8 7PFF-L  17,80  4,30
 ISK 0025 7PFF-L  25,00  4,27
 ISK 31R5 7PFF-L  31,50  4,59
 ISK 0050 7PFF-L  50,00  4,27
 ISK 0065 7PFF-L  65,00  4,11
 ISK 0080 7PFF-L  80,00  4,01
 ISK 0100 7PFF-L  100,00  4,56
 ISK 0150 7PFF-L  150,00  4,27
 ISK 0180 7PFF-L  180,00  3,96
 ISK 0200 7PFF-L  200,00  4,10
 ISK 0230 7PFF-L  230,00  4,10
 ISK 0320 7PFF-L  320,00  4,23
 ISK 0360 7PFF-L  360,00  3,82
 ISK 0380 7PFF-L  380,00  4,13
 ISK 0450 7PFF-L  450,00  4,10
 ISK 0480 7PFF-L  480,00  4,01
 ISK 0600 7PFF-L  600,00  3,90
 ISK 0650 7PFF-L  650,00  3,87
 ISK 0700 7PFF-L  700,00  3,83
 ISK 0810 7PFF-L  810,00  3,99
 ISK 1000 7PFF-L  1000,00  3,89
 ISK 1440 7PFF-L  1440,00  3,74
 ISK 1750 7PFF-L  1750,00  3,70
 ISK 2000 7PFF-L  2000,00  3,92
 ISK 3000 7PFF-L  3000,00  3,75
 ISK 8000 7PFF-L  8000,00  3,47

Other resistance values upon request

Certification: EPS 10 ATEX 1304X

II 2G Ex eb IIC T1...T6
II 2D Ex tb IIIC T85°C...T4
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