6.3.2 Minimum air clearances
When making electrical connections, maintain minimum air clearances for bare electrically live
components. The rated voltage can be found on the rating plate.
Table 6-2 Minimum air clearances
Rated voltage Minimum air clearance
Up to 6.6 kV 60 mm
Up to 11 kV 100 mm
Up to 13.8 kV 140 mm
Minimum air clearances for bare electrically live parts
6.3.3 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.
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 four weeks. Make sure that the terminals are de-energized before you
tighten the nuts.
See also
The 5 safety rules (Page 13)
6.3.4 Stepless mating face for sealing in the terminal box cover
The sealing face of the terminal box cover is formed by the terminal box enclosure and the
cable entry element. Therefore make sure these parts are correctly aligned, so as to ensure
the seal and hence the degree of protection.
Electrical connection
6.3 Inserting and routing the cables
SIMOTICS HV C 1NA14544WA600AG0-Z
56 Operating Instructions 06/2018
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