
04/02 © MEDC 2002
1. INTRODUCTION
This loudspeaker, intended for use in potentially explosive gas atmos-
pheres, has a power rating of up to 15 watts and is suitable for use in all
gas groups including hydrogen.
2. INSTALLATION
General
When installing and operating explosion-protected equipment, require-
ments for selection, installation and operation should be referred to eg.
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.
The DB18 is mounted via 2 off Ø7 mm (Ø0.28”) fixing holes in the ‘U’
shaped stirrup/mounting bracket. If required, the unit can be initially
placed via the Ø13mm (Ø0.51”) central hole in the stirrup. The unit can
be rotated to the required position and fixed via the two other holes.
MEDC recommend the use of stainless steel screws.
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power
to the unit is isolated.
Unscrew and remove the 2 off screws holding the cover assembly to the
base. Keep in a safe, accessible location.
Remove cover to gain access to the interior.
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