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Electrical connection
6.5 Conductor connection
6.5.3
Connecting aluminum conductors
If you are using aluminum conductors, then comply with the following:
• Use only cable lugs that are suitable for connecting aluminum conductors.
• Immediately before inserting the aluminum conductor, remove the oxide layer from the
contact areas on the conductor and/or the mating piece. Do this using a brush or file.
• Then grease the contact areas immediately using neutral Vaseline. This prevents a new
oxide layer from forming.
6.5.4
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
alternating voltage U
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
98
NOTICE
Aluminum flow due to contact pressure
Aluminum flows following installation due to the contact pressure. The connection using
clamping nuts can loosen as a result. The contact resistance increases, obstructing the
current from being conducted. This can result in fire and material damage to the
machine – or even in total failure, as well as material damage to the plant or system due
to machine failure.
• Retighten the clamping nuts after approximately 24 hours and then again after
approximately 4 weeks. Make sure that the terminals are de-energized before you
tighten the nuts.
Minimum air clearance dependent on rms value of the alternating voltage U
Rms value of the
rms
≤ 250 V
≤ 500 V
≤ 630 V
≤ 1000 V
increased by a factor of 1.1, so that the rated input voltage range is taken into account during
general use.
Minimum air clearance
Ex tc
Ex tb
Class II Div.2
Class I Div.2
AEx tc
3.0
3.0
5.5
8.0
Operating Instructions, 08/2023, A5E52990459A
mm
Ex nA
Ex ec
AEx ec
2.5
5.0
5.5
8.0
1MB1.33 Eagle Line shaft heights 71 ... 315
rms
Ex e
Ex eb
5.0
8.0
10.0
14.0
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