VACUUBRAND MZ 2C EX +IK+EK - Manual (Page 64)

page 64 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
ELNOR MOTORS NV
12/12/08 INSTRUCTIONS MANUAL 1 / 5
INSTRUCTIONS MANUAL: EXPLOSION PROOF MOTORS
INTRODUCTION
An explosion-proof, and in particular a flameproof motor, is one that is inherently safe when
working in potentially explosive atmospheres.
This means that its construction and assembly are designed so that ingress of explosive gases
or dusts is rendered harmless for the environment.
In the event of accidental ignition, provoking an explosion inside the motor housing, the motor
shell and brackets are strong enough to resist the internal pressure created by this explosion.
Moreover, assembly joints and shaft clearance must be long enough and offer minimum play, so
that hot gases or dusts resulting from an explosion will be cooled sufficiently to create no
possibility of an explosion outside the motor.
The outside temperature of the motor enclosure must also be kept well below the flash point of
the gases or dusts present in the hazardous atmosphere, both in normal and abnormal working
conditions.
Finally, it is the manufacturer's concern that components inside the motor should be able to
withstand an occasional explosion without being adversely affected.
The degree of risk is dependant on the constituents of the hazardous atmosphere: even
combustible dust can become explosive when spread in the air in the right proportion.
Therefore, existing risks have been divided into categories, depending on the temperature at
which the gas, dust or vapour mixtures become flammable, and also on their explosive energy.
For each of these, specific safety rules have been evolved on a European level.
Compliance with these rules is verified by an Ex notified body, approved for certification in
accordance with article 9 of the European Community Council directive, no 94/9/CEE of 23
march 1994.
Certification delivered by any of the notified bodies is automatically valid in all CEE countries. It
is recognised by all European adherent countries and also very seriously considered in many
countries overseas, U.S.A. included.
In Belgium, it is the “Institut Scientifique de Service Public”, in short ISSeP, which has been
chosen for its long experience in problems of safety in mining industries.
As explosion proof motors are constructed with special materials and technologies that comply
with the legal regulations concerning potentially explosive atmospheres, a wrong connection or
a minor modification of the motor destroys the compliance with security regulations. The rules
concerning explosion proof apparatus must be observed unconditionally. Note that our motors
are approved for a specific group of hazardous areas and temperature classes.
USE OF Ex d II B / IP6x MOTORS
The user is responsible for the choice of the type of explosion proof motor. He has to take into
account the explosion risks area in which the motor will run (classification of hazardous areas,
temperature class,…).
Before installation, the user has to check if the group and protection class, marked on the motor
label, corresponds with the requested conditions.
INCOMING INSPECTION
Inspect the motor to detect any signs of damage during the transport.
Check that the motor nameplate data complies with your order or specification. In the unlikely
event of a claim, please contact our Sales Office.
„INSTRUCTIONS MANUAL“ for motors with mark „EX“