All dimensions in mm. All figures are illustrations of photos. Changes reserved
21
Technical Information
Electrical Data:
- Current load (nominal and max. continuous):
Data is based on contacts terminated to correct size of conductors. No additional contact
temperature rise due to incorrect conductors or cables. All measured contact temperature
rise is due to contact resistance, only.
- Nominal current:
The current which causes a 45°C temperature rise (for example: for 23°C to 68°C)
Derating factor
Current load values given in the connector and contact specifications in previous sections
are single contact current loads.
With multi-position connectors and cables, the temperature rise is higher that with single
contacts. It is therefore necessary to apply a derating factor to calculate the maximum
current load per contact in multi-pole connectors. There is no precise specification for
connectors. In praxis, on uses the
derating factor form DIN 57 298 Part 2 and VDE 0298 Part 2 for multi-conductor cables
(Ref. DIN 41 640, Part 3).
Load Derating Factor
plastic jacketed cable in air form 1.5 – 10 mm² in air
Example:
The cable has 24 conductors with a cross section of 6 mm² each.
From the diagram the derating factor is determined as 0.4.
A single copper conductor with 6 m² cross section can carry a load of 44A. Therefore, a
cable with 24 conductors of each having a 6 mm² cross section can carry maximum 17.6 A
per conductor (44 A x 0.4 = 17.6A).
ODU MAC LC – Technical Information
Derating Factor
Multi-Conductor cable with cross-section
1.5 to 10 mm². in air
