Terminal Boxes With Type Of Protection "Ex E/Ex Eb - Siemens SIMOTICS HV C Operating And Installation Instructions

Electrical connection
6.2 Preparation
6.2.6

Terminal boxes with type of protection "Ex e/Ex eb"

Risk of explosion due to damaged seals of the pressure relief flap
If the seal of the pressure relief flap (preset rupture point) in the lower section of the terminal
box is damaged, then the explosion type of protection is no longer guaranteed. An explosion
can occur in operation. This can result in death, serious injury or material damage.
● Only use original spare parts when repairing the damaged seal.
Risk of explosion if components are used that have not been approved
If, for terminal boxes, type of protection "Ex e" or "Ex eb", cables and cable glands as well as
simple screw plugs are used, then there is a risk of explosion in operation. This can result in
death, serious injury or material damage.
● Use only cable entries that have been tested and certified in accordance with
● Use only screw plugs that have been tested and certified in accordance with
Risk of explosion as a result of an incorrectly drilled cable entry plate
For terminal boxes, type of protection "Ex e" or "Ex eb", machining threads in an undrilled
cable entry plate, can diminish the strength of the cable entry plate. Sparks can occur in an
explosive atmosphere that can result in an explosion. This can result in death, serious injury
or material damage.
● Carefully ensure that the cable entry plate is still adequately strong after machining the
Drill holes in the cable entry plate
If you drill holes in the cable entry plate of terminal boxes for types of protection "Increased
safety "e"" or "Intrinsic safety "i"", then document the data about these holes in the motor
documentation:
● Number and size of the holes
● Type of thread, e.g. metric or NPT
Data regarding the installation of pipes and accessories is provided in GB3836.15.
● 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.
58
WARNING
WARNING
IEC / EN 60079–7.
IEC / EN 60079–7 to close openings that are not to be used.
WARNING
threads.
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.
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
Operating Instructions 06/2018