HCNF / HCNCU
- Mineral insulated heating cable for temperature maintenance or heating in industrial processes
- 400°C: maximum tolerance temperature
- Copper or copper alloy conductor, cupronickel sheath
- Corrosion and flame resistant
- Usually supplied in customised circuits, already terminated and laser-spliced at the factory
Notes on operation:
- Maximum sheath temperature: 400°C
- Minimum installation temperature: -60°C
- Power supply voltage: up to 500V
- Conductor: copper or copper alloy
- Insulation resistance: 1000 M Ohm / 1000 m factory test
Examples of application:
- Heating or temperature maintenance of industrial processes up to 400°C
- Antifreeze of instrumentation and primary lines with high temperatures
- Ideal for nuclear plants, bitumen processing, chemical and petrochemical plants and power stations
supply voltage:
p to 500V
Temperature classes:
Maximum sheath temperature: 400°C
Minimum installation temperature: -60°C
Available models and features:
| Model | Cable diameter in mm | Conductor | Conductor diameter in mm | Resistance in ohms/m | Correction factor |
| HCNF1M1,6 | 3,2 | copper alloy | 0,62 | 1,6 | 1 |
| HCNF1M1 | 3,4 | copper alloy | 0,47 | 1 | 0,948 |
| HCNF1M0,630 | 3,7 | copper alloy | 1 | 0,63 | 0,88 |
| HCNF1M0,400 | 4 | copper alloy | 1,25 | 0,4 | 0,822 |
| HCNF1M0,25 | 4,4 | copper alloy | 1,58 | 0,25 | 0,756 |
| HCNF1M0,16 | 4,9 | copper alloy | 1,97 | 0,16 | 0,688 |
| HCNCU1M0,063 | 3,2 | copper | 0,59 | 0,063 | 1 |
| HCNCU1M0,04 | 3,4 | copper | 0,74 | 0,04 | 0,948 |
| HCNCU1M0,025 | 3,7 | copper | 0,94 | 0,025 | 0,88 |
| HCNCU1M0,017 | 4,6 | copper | 1,14 | 0,017 | 0,727 |
| HCNCU1M0,011 | 4,9 | copper | 1,41 | 0,011 | 0,688 |
| HCNCU1M0,007 | 5,3 | copper | 1,77 | 0,007 | 0,644 |
| HCNCU1M0,004 | 5,9 | copper | 2,34 | 0,004 | 0,59 |
Maximum bending radius: 6 times the cable diameter
The HCNF or HCNCU cable is a cable in which the power supplied does not vary as the temperature varies. The cable must be powered at both ends and the power supplied is determined by the well-known Joule formula: W= V2/ρ x L
Where:
– W is the power supplied by the entire heating circuit
– ρ is the resistivity in ohm/m of the heating cable used
– L is the length of the heating circuit in m
The mineral insulated cable is constructed from a resistive copper alloy conductor insulated with magnesium oxide and a cupronickel metal outer sheath. These cables cannot be cut and spliced to vary the length of the circuit from that determined at the time of sizing. Varying the length of the heating circuit results in a variation of the power supplied with the danger of subjecting the cable to excessive temperatures with consequent damage or having less power available than required. These cables always require a control thermostat to prevent over-temperatures which would cause damage. For installations in an ATEX zone, the temperature control must be carried out in accordance with CEI-EN 60079-30-2 and subsequent amendments.
Maximum sheath temperature based on model:
Example: cable type HCNF1M 0.4 with power 53 W/m in 200°C environment; equivalent power: 53 x 0.88 = 46.6 W/m approx.
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