MEDC DB10 - Manual (Page 3)

1.0 INTRODUCTION
This range of loudspeakers, intended for use in potentially explosive gas atmospheres, has a power rating of
up to 15 Watts and is suitable for use in gas groups IIB, IIB + hydrogen and IIC
The flamepaths, flare and body are manufactured from a UV stable glass reinforced polyester. Stainless steel
screws and mounting stirrup are incorporated to ensure a corrosion free product.
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, 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 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 is mounted via 2 off Ø7mm fixing holes in the U-shaped stirrup/mounting bracket. If required, the unit
can be initially placed via the Ø13mm central hole in the stirrup. The unit can then be rotated to the required
position and fixed via the other two holes.
The 2 off fixing holes have been designed to accept an M6 screw or bolt. MEDC recommend the use of
stainless steel screws.
The elevation of the unit can be adjusted by loosening the 2 off M6 dome nuts which fasten the stirrup to the
body. The unit can then be adjusted by rotating to the required position and then tightening the M6 dome
nuts.
The unit should be positioned such that debris, dust or water cannot settle in the re-entrant horn.
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Unscrew the 3 off M5 screws (4.0mm A/F hexagon key) holding the Exe cover to the enclosure. The cover
screws are captive and will remain in the cover. Carefully remove the cover to gain access to the interior of
the terminal chamber.
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 back onto the enclosure, avoiding damage to the
mating surfaces and ensuring the o-ring is correctly seated in its groove during re-assembly. Tighten the 3 off
M5 screws (4.0mm A/F hexagon key) evenly.
© Cooper MEDC 2011 08/11