Technical data

MKE UL/CSA Potentially-explosive areas 4-1
DOK-MOTOR*-MKE*UL/CSA*-PR01-EN-P
4 Potentially-explosive areas
4.1 Definitions
Terms
The following terms are used in European Standard EN 50014: 1992.
All objects that wholly or partially serve to use electrical energy. This
includes, among others, objects to generate, conduct, distribute, store,
measure, control, transform and consume electrical energy, as well as
objects for telecommunications technology.
An area in which the atmosphere is capable of being explosive (the
danger is potential).
A mixture of air under atmospheric conditions and flammable materials in
the form of gas, steam or vapor, in which, after ignition, burning spreads
into the unignited mixture.
A certain potentially explosive mixture that is used to test electrical
equipment for potentially explosive areas.
The equipment temperature that is reached during normal operation.
The highest attainable operating temperature.
NOTE: Each piece of equipment can have different operating
temperatures on different parts.
The highest temperature that is attained in operation under the least
favorable conditions (but within the recognized tolerance) on a part or
surface of a piece of electrical equipment, whereby a surrounding
potentially explosive atmosphere can be ignited.
The special standards that are enacted for electrical equipment to prevent
the ignition of a surrounding potentially explosive atmosphere.
A numeric classification, preceded by the symbol "IP", that is used for the
housings of electrical equipment in order to:
· provide the protection of persons against contact with parts that are
under power or moving (excepting smooth shafts or similar parts)
within the housing,
· provide protection of the electrical equipment against penetration by
solid foreign substances, and, if provided by the classification,
· ensure the protection of the electrical equipment against the harmful
penetration of water.
NOTE: The housing IP protective class is not necessarily identical to the
housing of the equipment for the ignition protection class.
A quantitative value, usually provided by the manufacturer, for a specific
operating condition of a part, a unit or a piece of equipment.
Summary of rated values and operating conditions.
Device that permits the entrance of one or more electrical and/or fiber-
optical cables or lines into a piece of electrical equipment; the
corresponding ignition protection class remains unchanged.
A cable and line inlet that is tested independently of the equipment
housing, but is certified as an operating element ; it can be installed in the
housing during assembly without the need for additional certifications.
Material that permits the introduction of piping into electrical equipment.
Element of a cable and line inlet which affects the sealing ring in such a
manner that it can fulfill its sealing function.
Electrical equipment
Potentially explosive area
Potentially explosive gas
atmosphere
Potentially explosive test
mixture
Operating temperature
Maximum operating temperature
Maximum surface temperature
Ignition protection class
Class of protection of the
housing (IP)
Rated value
Rated data
Cable and line entrance
Ex cable and line entrance
Entrance for piping
Pressure part