Siemens 1MB115 Installation And Maintenance Manual page 106

4.4.2 Minimum surface area of grounding conductor
Table 4-9 Minimum cross-sectional area of grounding conductor
Minimum cross-section of the phase
Internal ground terminal
When making connections, ensure the following:
• Ensure that the connecting surface is bare and is protected against
corrosion using a suitable substance, e.g. acid-free Vaseline.
• Arrange the flat washer and spring washer under the bolt head.
• Locate the cable lug under the clamping bracket.
• Use the terminals designated for the grounding conductor in the
terminal box.
• Observe the tightening torque for the locking screw.
External ground terminal
When making connections, ensure the following:
• Ensure that the connecting surface is bare and is protected against
corrosion using a suitable substance, e.g. acid-free Vaseline.
• Position the cable lug between the contact bracket and the grounding
bracket; do not remove the contact bracket pressed into the enclosure!
• Arrange the flat washer and spring washer under the bolt head.
• Use the marked connection location for the grounding conductor on the
stator housing.
• Observe the tightening torque for the locking screw.
Table 4-10 Screw size of the grounding cable, external grounding
The additional threaded hole on the grounding socket is optionally available
for additional equipotential bonding of high-frequency voltages and currents
in converter operation.
106
conductor for installation S
mm²
S ≤ 25
25 < S ≤ 50
S > 50
Frame size
80 ... 112
132 ... 160
180 ... 280
315 ... 355
Minimum cross-section of the
associated grounding connection
Thread size for the grounding conductor
1 x M 5
2 x M 6
2 x M 8
2 x M 12
mm²
S
25
0.5 S