Technical data

4-2 Potentially-explosive areas MKE UL/CSA
DOK-MOTOR*-MKE*UL/CSA*-PR01-EN-P
Element of a cable and line inlet which prevents tension or torsion of the
cable or line from being transferred to the connectors.
Ring that is used at the inlets of cables, lines or pipework in order to
provide a seal between the inlet and the cable, line or pipework.
Space separating the main housing or a part thereof, that may or may not
be connected with the main housing, and which contains connectors.
Terminals, screws or other parts that provide an electrical connection
between the conductor and the outer electric circuits.
Insulation device that guides one or more electrical conductors through an
inner or outer wall of a housing.
A piece of electrical equipment for potentially explosive areas, or a
module (excepting an Ex cable and line entrance), designated by the
symbol "U", which may not be used by itself in such areas and which
requires additional certification when it is installed in electrical equipment
or systems for use in potentially explosive areas.
Zones
Potentially explosive areas are classified into the following zones
according to the probability of the presence of a potentially explosive
atmosphere.
Note: The following information is based on EN 60079-14:1997 and
BGBl 1996, Part 1. See these regulations for detailed
information.
Zone 0 includes areas in which a potentially explosive atmosphere,
consisting of a mixture of air and gases, vapors or steam, is constantly
present, over an extended period of time..
Electrical equipment may be used in Zone 0 if it satisfies the requirements
according to EN 50020 : 1994 (intrinsic safety “i”).
Zone 1 includes areas in which it can be assumed that a potentially
explosive atmosphere consisting of gases, vapors or steam is
occasionally present.
Electrical equipment may be used in Zone 1 if it is manufactured
according to the requirements for Zone 0, or to one of the ignition
protection classes in Fig. 4-1.
Zone 2 includes areas in which it can be assumed that an potentially
explosive atmosphere consisting of gases, vapors or steam will not occur
but, if it nevertheless does occur, then only rarely and for a short period of
time.
Electrical equipment may be used in Zone 2 if it:
· is manufactured according to the requirements for Zones 0 or 1.
· is manufactured specifically for Zone 2.
· satisfies the requirements of a recognized standard for industrial
electrical equipment and has no hot surfaces that can be ignited in
uninterrupted operation.
Stress relief equipment
Sealing ring
Connection space
Connectors
Guide
Ex- component
Zone 0
Zone 1
Zone 2