Figure 41. Low voltage cable grounding points
1 The grounding pin of the low voltage connector.
2 Cable shield grounding point.
Testing the power cable shield grounding
(earthing)
The power cable shields are grounded (earthed) through
the connection terminal
and further to
the electric machine enclosure. After the cable gland assembly and power cable installations, and
any time when needed, make sure that the grounding (earthing) connections are correct.
1. Connect one terminal of the measurement device to the cable shield of one power cable (in
the inverter end of the cable)
2. Connect the other terminal of the measurement device to the cable shield of an other power
cable. You can also use the machine enclosure grounding point for the measurement.
3. Measure the resistance between the two cable shields or between the cable shield and the
enclosure grounding point.
4. Change the measurement device terminal(s) to the shield of different power cable and repeat
the measurement until all cables have been measured.
Testing the low voltage (measurement signal) cable shield grounding (earthing)
The low voltage (measurement signal) cable shield is connected to the grounding (earthing) point.
After cable installation, and any time when needed, make sure that the grounding (earthing)
connection is valid.
1. Connect one terminal of the measurement device to the low voltage cable shield (in the non-
machine end of the cable).
2. Connect the other terminal of the measurement device to the machine enclosure grounding
point.
3. Measure the resistance between the cable shield and the enclosure grounding point.
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