Connecting Aluminum Conductors - Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions

Explosion hazard if cable lugs without side guards are used
For cable cross-sections under 70 mm
minimum air clearances may be underrun and cause an explosion.
This can result in death, serious injury, or material damage.
● For cable cross-sections under 70 mm
● Make sure that the minimum air clearances are observed.
Use only sealing plugs, cable entries and conductor entries, that are certified and marked for
use in the respective hazardous area (the zone).
● If you are using cable glands, use only certified cable glands with strain relief. Comply with
● Correctly close unused threads or holes, maintaining the IP degree of protection. The IP
● Replace any unused cable glands by certified screw plugs.
6.3.6

Connecting aluminum conductors

If you are using aluminum conductors, comply in addition 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
● Then grease the contact areas immediately using neutral Vaseline in order to avoid re-
SIMOTICS M-1PH8
Operating Instructions 05/2012 A5E03986435A AA
WARNING
the installation and operation conditions specified in the certificate for these cable glands
and check that they have been complied with.
degree of protection is stamped on the rating plate.
contact areas on the conductor and/or the mating piece, by brushing or filing.
oxidation.
CAUTION
The aluminum flow is determined by contact
The aluminum flow is determined by contact following installation. The connection with
the clamping nuts can loosen as a result. The contact resistance would increase and the
current-carrying be impeded; as a consequence the terminal box and the surrounding
components could burn. This could result in material damage to the machine or even in
total failure, which could in turn lead to indirect material damage to the system.
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.
, cable lugs without side guard may twist. The
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, use only cable lugs with side guard.
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Electrical connection
6.3 Connecting
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