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Electrical connection
6.2 Connecting
Note
Undrilled entry plate
If the entry plate is undrilled, you should match the number and size of the cable glands to
the operating conditions. Not applicable for terminal boxes of the Ex d type of protection.
1. Unscrew the cable entry plate.
2. Drill the required number of holes or threads in the required size into the cable entry plate.
3. Mount the cable entry plate and the cables with the cable glands onto the terminal box.
4. Seal the screwed sockets on the cable glands in accordance with the degree of protection.
Use only sealing plugs, cable entries and conductor entries, that are certified and marked for
use in the respective hazardous area (the zone).
6.2.9
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 6-4
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.
60
The thickness of the plate is selected in such a way as to give a sufficient number of turns
when the holes are tapped.
Please note that you are responsible for ensuring that the entry plate still has sufficient
strength after the holes have been drilled and tapped.
After the cables have been inserted into the terminal box, tighten the cable glands and parts
for strain relief to the torque specified by the manufacturer.
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
Minimum air clearance
rms
rms
8 mm
10 mm
12 mm
14 mm
LOHER CHEMSTAR 1PS5
Operating Instructions 03/2014
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