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06/01 © MEDC 2001
1. INTRODUCTION
These horn units have been designed for use in harsh environmental conditions.
2. INSTALLATION
General
When installing and operating explosion-protected electrical equipment, require-
ments for selection, installation and operation should be referred to eg. IEC
60079-14 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 UL listed stopping plugs are used to blank off unused
gland entry points and that the NEMA/IP rating of the unit is maintained.
The DB3 is mounted via 2 x Ø 0.354” (9 mm) fixing holes in the ‘u’ shaped
stirrup/mounting bracket. The 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 x M6 screws which
fasten the stirrup to the horn. The unit can then be adjusted by rotating to the
required position and then tightening the M6 screws. The DB3 should be posi-
tioned 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 6 off screws holding the cover to the unit. Twist the cover gently
clockwise and anti-clockwise, whilst pulling it away from the unit. Remove to gain
access to the interior of the base.
Cable termination should be in accordance with specifications applying to the
application. MEDC recommend that all cables and cores should be fully identi-
fied.
Ensure that only correct UL Listed cable glands are used and that the assembly is
shrouded and correctly earthed.