47
Explosion protection
The marking
(II2G), EEx de IIC T4, for instance, indicates where the motor
is to be used and that it has been designed, built and approved according to
the relevant European standards required for operation in areas subject to
explosion hazards.
Please note!
The motor must not be altered in any way whatsoever and the
operating instructions set forth herein are to be complied with
always.
If the motor is altered or repairs need to be made, these are to be performed
by the manufacturer or by repair workshops or factories that possess the
necessary know-how. Before the starting the motors again, conformity with the
requirements of EC directives 76/117/EEC or 94/9/EC and 99/92/EC by said
sites is to be ascertained and confirmed by means of an appropriate marking
on the motor or by issuing a test report.
If these requirements are not met, the motor is no longer classified as
explosion-protected and the marking - see above - is to be removed.
Instructions for ensuring explosion protection during operation
• All of the contact screws and nuts of the electrical connections are to be
tightened securely to prevent excessively high contact resistance values that
may lead to an excessive degree of overheating of the contact point; torque
values (Î Table 8, page 24).
• Use the utmost caution when connecting the mains cable. Observe the creep
distances and clearances. Use duly the sealing parts of the cable lead-ins and
connections spaces as well as the lead-in parts envisaged for the pull relief or
as protection against torsion in order to maintain the degree of protection of the
connection spaces
(Î Section "Mains and guard circuit connection ", page 21).
• Eliminate any damages immediately and use only original spare parts. The
proper performance of the works by the aforementioned sites is to be
examined as per the relevant EC directives, in Germany by a qualified expert
as per “Betriebssicherheitsverordnung”, abroad as per the relevant national
regulations in force and to be confirmed by means of an appropriate marking
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