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Electrical connection
6.4 Inserting and routing the cables
6.4.7
Minimum air clearances
After proper installation, verify that the minimum air clearances between non-insulated parts
are maintained. Be aware of any protruding wire ends.
Table 6-5
Values apply at an installation altitude of up to 2000 m.
When determining the required minimum air clearance, the voltage value in the table may be increased
by a factor of 1.1, so that the rated input voltage range is taken into account during general use.
6.4.8
Internal equipotential bonding
The internal equipotential bonding between the grounding terminal in the box enclosure and
the motor frame is established through the terminal box retaining bolts. The contact locations
underneath the bolt heads are bare metal and protected against corrosion.
The standard cover fixing screws are sufficient for equipotential bonding between the terminal
box cover and terminal box housing.
Note
Connecting points are available at the frame or bearing end shield to connect an external
protective conductor or potential bonding connector.
72
Minimum air clearance dependent on rms value of the alternating voltage U
Rms value of the alternating voltage V
≤ 500 V
≤ 630 V
≤ 800 V
≤ 1000 V
≤ 1250 V
Minimum air clearance
rms
SIMOTICS HT Series HT-direct 1FW4...1......A
rms
8 mm
10 mm
12 mm
14 mm
18 mm
Operating Instructions 11/2018
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