Wiring Guidelines

The following wiring guidelines must be respected to reduce disturbance due to EMC on the behavior of the LTMT main unit:

• Keep sufficient distance as possible between the communication cable and the power and/or control cables (minimum 30 cm or 11.8 in.).

• Cross over different types of cables at right angles, if necessary.

• Do not bend or damage the cables. The maximum bending radius is 10 times the cable diameter.

• Avoid sharp angles of paths or passage of the cable.

• Use shielded cables to connect ground fault current transformers:

  • The cable shield must be connected to a protective ground at both ends.

  • The connection of the cable shield to the protective ground must be as short as possible.

  • Connect together all the shields, if necessary.

  • Perform the grounding of the shield with a collar.

• Systematically add filters on contactor coils.

For more information, refer to chapter ElectroMagnetic Compatibility (EMC) in Electrical Installation guide (available in English only) and Okken and Blockset guide.