Cooper MEDC 2011 01/12
English
1.0 INTRODUCTION
This range of loudspeakers, intended for use in potentially explosive gas and dust atmospheres, has a power
rating of up to 25 watts and is suitable for use in all gas groups including hydrogen.
The flamepaths, flare and the body are manufactured completely from a UV stable glass reinforced polyester.
Stainless steel screws and sinter are incorporated thus ensuring a corrosion free product. A tapered Flamepath
is used to overcome the problems of assembly of parallel spigot flamepaths.
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements for selection, installation and
operation should be referred to eg. IEC60079-14 worldwide and the ‘National Electrical Code’ in North
America. Additional national and/or local requirements may apply.
Ensure that all nuts, bolts and fixings are secure.
Ensure that only the correct listed or certified stopping plugs are used to blank off unused gland entry points
and that the NEMA/IP rating of the unit is maintained. MEDC recommend the use of a sealing compound such
as HYLOMAR PL32 on the threads of glands and stopping plugs in order to maintain the IP rating of the unit.
The unit mounts via 2 off ∅23/64” (∅9mm) mounting holes in the ‘U’ shaped stirrup / mounting bracket.
The holes have been designed to accept an M8 screw or bolt. If required the unit can be initially placed using
the ∅½” (∅13mm) central hole in the mounting bracket. The unit can then be rotated into the correct
orientation and fixed via the other two holes.
When the unit is fixed in the required position, it’s alignment can be adjusted by loosening the two M6 screws which
fasten the mounting bracket to the speaker. The speaker can then be adjusted to the required position and the screws
tightened. The unit should be positioned such that dust/debris or water cannot settle in the re-entrant horn.
MEDC recommend the use of stainless steel screws.
Cable Term nat on
CAUTION: Before remov ng the cover assembly, ensure that the power to the un t s solated.
General
The cover is secured with 6 off M5 cover screws (4.0mm A/F hexagon key). Once the cover fixings are
unscrewed, twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away from the base.
Remove to gain access to the interior.
Ensure all non-captive fixings are kept in a safe accessible location during cable termination.
Cable termination should be in accordance with specifications applying to the required application. MEDC
recommends that all cables and cores should be correctly identified. Please refer to the wiring diagram
provided with the product.
Ensure that only the correct listed or certified cable glands are used and that the assembly is shrouded and
correctly earthed.
All cable glands should be of an equivalent NEMA/IP rating to that of the speaker and integrated with the
unit such that this rating is maintained.
The internal earth terminal, where fitted, must be used for the equipment grounding connection and the
external terminal is for a supplementary bonding connection where local codes or authorities permit or require
such a connection.
Once termination is complete, carefully replace the cover assembly back onto the body, avoiding damage to
the mating surfaces. Replace the cover screws into the holes in the cover assembly and tighten evenly. Ensure
the O-ring is seated correctly on the cover during re-assembly. Ensure the required maximum gap of 0.15mm
is maintained between the cover and the base once assembled.
