Cables must not be twisted, stretched, crushed or bent. Use only cables that comply with the cable specification. Consider the following in determining suitability of the cables:
Suitable for drag chain applications
Temperature range
Chemical resistance
Outdoor installation
Underground installation
Shield connection possibilities:
Motor cable: The motor cable shield is fastened in the shield clamp at the bottom of the device.
Other cables: The shields are connected to the shield connection at the bottom of the device.
Alternative: Connect the shield via shield clamps and rail, for example.
Potential differences can result in excessive currents on the cable shields. Use equipotential bonding conductors to reduce currents on the cable shields. The equipotential bonding conductor must be rated for the maximum current.
| WARNING | |
|---|---|
1) Multipoint grounding is permissible if connections are made to an equipotential ground plane dimensioned to help avoid cable shield damage in the event of power system short-circuit currents.
The following sections describe the conductor cross sections for two methods of installation:
Method of installation B2:
Cables in conduits or cable trunking systems
Method of installation E:
Cables on open cable trays
|
Cross section in mm2 (AWG) |
Current-carrying capacity with method of installation B2 in A(1) |
Current carrying capacity with method of installation E in A(1) |
|---|---|---|
|
0.75 (18) |
8.5 |
10.4 |
|
1 (16) |
10.1 |
12.4 |
|
1.5 (14) |
13.1 |
16.1 |
|
2.5 (12) |
17.4 |
22 |
|
4 (10) |
23 |
30 |
|
6 (8) |
30 |
37 |
|
10 (6) |
40 |
52 |
|
16 (4) |
54 |
70 |
|
25 (2) |
70 |
88 |
|
(1) Values as per IEC 60204-1 for continuous operation, copper conductors and ambient air temperature 40 °C (104 °F). See IEC 60204-1 for additional information. The table is an excerpt from this standard and also shows cable cross-sections that are not applicable with regard to the product. |
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Note the derating factors for grouping of cables and correction factors for other ambient conditions (IEC 60204-1).
The conductors must have a sufficiently large cross section so that the upstream fuse can trip.
In the case of longer cables, it may be necessary to use a greater conductor cross section to reduce the energy losses.