4
Eaton MEDC technical manual
DB4BM LOUDSPEAKER TECHNICAL MANUAL
TM277.3
www.eaton.com
4
Eaton MEDC technical manual
DB4BM LOUDSPEAKER TECHNICAL MANUAL
TM277.3
www.eaton.com
INTRODUCTION
This range of loudspeakers, intended for use in potentially explosive gas and dust atmospheres, has a power rating of up
to 25 watts
The Ex enclosure is manufactured from either stainless steel or marine grade alloy with a rugged thermoplastic flare.
Stainless steel mounting bracket, cover screws and fixings are incorporated throughout thus ensuring a corrosion
free product.
An uncertified version is available for use in non-explosive atmospheres.
GENERAL SAFETY MESSAGES AND WARNINGS
All instructions and safety messages in this manual must be followed to allow safe installation of the device. The device
must only be installed and maintained by correctly trained site personnel/installers.
i.
To reduce the risk of ignition of hazardous atmospheres and shock, do not apply power to the device until
installation has been completed and the device is fully sealed and secured.
ii.
To reduce the risk of ignition of hazardous atmospheres and shock, keep device tightly closed when the circuit is
energised.
iii
Before removing the cover for installation or maintenance, ensure that the power to the device is isolated.
iv.
Following installation, test the device to ensure correct operation.
v.
Following installation ensure a copy of this manual is made available to all operating personnel
vi. When installing the device, requirements for selection, installation and operation should be referred to e.g. IEE
Wiring Regulations and the ‘National Electrical Code’ in North America. Additional national and/or local requirements
may also apply.
vii. Cable termination should be in accordance with the specification applying to the required application. MEDC
recommends that all cables and cores should be correctly identified. Please refer to the wiring diagram in this
manual (or separate diagram provided with the unit).
viii. Ensure that only the correct listed or certified cable glands are used and that the assembly is shrouded and
correctly earthed.
ix. Ensure that only the correct listed or certified stopping plugs are used to blank off unused gland entry points in
accordance with EN/IEC60079-14 clauses 16.3, 16.4 & 16.5 and that the NEMA/IP rating of the unit is maintained.
x.
Maintain the IP rating of the unit by sealing glands in accordance with gland certification / manufacturer’s
instructions (i.e. use of a sealing washer or specific compound.)
xi. The internal grounding terminal shall be used for the grounding connection and the external terminal, if available, is
for a supplementary bonding connection where local codes or authorities permit or require such a connection.
xii. When installing the device, MEDC recommends the use of stainless steel fasteners. Ensure that all nuts, bolts and
fixings are secure.
xiii. The unit should be positioned such that debris, dust or water cannot settle in the re-entrant horn.
xiv. The unit should be positioned such that any solid object, not part of the equipment, is a minimum of 40mm from
the Ex d flamepath joint.
xv. This unit should not be driven by any source which produces ultrasonic sound.
xvi. The front driver cover of the unit, situated underneath the thermoplastic main flare, which encloses the loudspeaker
driver shall not be opened as it is not for field installation or maintenance use
xvii. When the unit is used in dust atmospheres, the cable entries or blanking plugs used shall be sealed to maintain the
IP6X rating, in accordance with the applicable installation codes
xviii. Warning – Do not open when an explosive atmosphere is present
xix. Cable temperature rise 30K(20K for 8W units)
xx. Potential Electrostatic Charging Hazard, protect from direct airflow from exhaust ducts and the like which may
cause a charge transfer. If the unit requires cleaning, only clean exterior with a damp cloth to avoid electrostatic
charge build-up. Ensure the equipment is correctly earthed.
