Equipment group II Category 1
Equipment that are designed so as to function in conformity with the op‐
erational parameters established by the manufacturer and so as to ensure a
very high level of protection. Equipment of this category is intended for use in
areas in which explosive atmospheres caused by mixtures of air and gases,
vapours or mists or by air/dust mixtures are present continuously, for long pe‐
riods or frequently. Equipment of this category must ensure the required level
of protection, even if there are only rare incidents, and is characterized by
means of protection, meaning that
●
in the event of failure of one means of protection, at least an independent
second means of protection provides the required level of protection; or
●
in the event of two faults occurring independently of each other, the re‐
quired protection is guaranteed.
Motors of equipment group II, category 1 for the use in potentially
explosive areas are not offered by Bosch Rexroth.
Equipment group II Category 2
Equipment designed so as to function in conformity with the operational
parameters established by the manufacturer and so as to ensure a high level
of protection. Equipment of this category is intendend for use in areas, in which
it can be expected that an explosive atmosphere of dust / air mixture can occur
occasionally. The means of protection relating to equipment in this category
ensure the required level of protection, even in case of frequently occurring
disturbances which normally have to be taken into account.
are equipment according to equipment group II, category 2 for use
in potentially explosive areas.
Equipment group II Category 3
Equipment designed so as to function in conformity with the operational
parameters established by the manufacturer and so as to ensure a normal level
of protection. Equipment of this category is intended for use in areas in which
explosive atmospheres caused by dust whirled up are unlikely to occur or, if
they do occur, are likely to do so only rarely and for a short period of time.
Equipment of this category ensures the required level of protection during nor‐
mal operation.
in housing type "S" is equipment according to equipment group II,
category 3 for use in potentially explosive areas.
The following terms are used in the European Standard EN 50014: 1992.
Electrical equipment
All items as a whole or in part for the utilization of electrical energy. These
include, among others, items for the generation, transmission, distribution,
storage, measurement, regulation, conversion, and consumption of electrical
energy for telecommunication applications.
Potentially explosive area
An area which could become explosive (the danger is a potential one).
Explosive gas atmosphere
A mixture of air, under atmospheric conditions, with inflammable substances in
the form of gas, vapour or mist, in which - after an ignition - a combustion
spreads throughout the unburnt mixture.
Explosive test mix
A specified explosive mixture used for the testing of electrical equipment for
potentially explosive areas.
Operating temperature
The temperature that is reached, when the apparatus is operating at its rating.
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Bosch Rexroth AG | Electric Drives
and Controls
Rexroth MKE Synchronous Motors | Project Planning Manual
Operating Conditions and Application Notes
