User's Manual

3CC12425AAAA TQ BJA 01 Issue 01 - April 2001 - Draft 03 33/70
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3.7.3 – Earthing the NT units
Considerations
– NT casing must be connected to the main earth with a cable 16 mm
2
minimal cross-section whose
length must not exceed 2.40 m. The grounding terminal is on the right of the NT unit (connections
side) and is in the form of a tapped hole (see Figure 15 – Earthing the (NCAxxx) NT unit).
– The earth connection should be made as directly as possible between the unit and the general
earthing system of the side (bar, rod, plate, etc.).
– The NCAxxx NT units are grounded through the 85 – 264Va main connector; for the NGAxxx
units, only one earthing point is necessary, after the earthing of all the NT units.
Steps
1. Crimp a lug (ref.: 16-6 CT) on to the earthing cable (16 mm
2
cross-section).
2. Screw the cable lug into the terminal designed for this purpose. Use an M6 screw.
Figure 15 – Earthing the (NCAxxx) NT unit
Figure 16 – Earthing the (NCFxxx) NT Lite unit
General earthing lug