MEDC FB12 Notice Technique page 3

English
1.0 INTRODUCTION
These certified steady beacons have been designed for use in potentially explosive atmospheres and harsh
environmental conditions. The enclosures are suitable for use offshore or onshore, where light weight combined
with corrosion resistance is required.
The beacon housing is manufactured completely from a U.V. stable, glass reinforced polyester. Stainless steel
screws and mounting bracket are incorporated ensuring a totally corrosion free product.
Units can be painted to customer specification and supplied with identification labels.
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements for selection, installation and op-
eration 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 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 can either be directly mounted using the inserts moulded into the back of the enclosure (standard), or
a backstrap (optional) can be fixed to the base of the unit thus giving an optional mounting position for when
direct mounting is deemed unsuitable.
There are 2 off M8 inserts in the base of the enclosure for direct mounting.
Please note: for direct mounting, observe the following formula to determine length of fixing screw required:-
Length of screw = Thickness of mounting surface + 10mm
There are 2 off Ø11.5mm mounting holes in the optional backstrap. These have been designed to accept an
M10 screw or bolt
MEDC recommend the use of stainless steel screws. Ensure that all nuts, bolts and fixings are secure.
Note: The cover fixing screws for the unit must be stainless steel grade A2-70 minimum, M8 x 30mm long
socket head cap screws
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Unscrew and remove the 6 off M8 screws (6.0mm hexagon key) holding the cover assembly to the base. Keep
in a safe, accessible location as they are non-captive.
Twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away from the base. Remove to
gain access to the interior.
Cable termination should be in accordance with specifications applying to the required application. MEDC rec-
ommends 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 beacon and integrated with the unit
such that this rating is maintained.
© Eaton MEDC Ltd 2017 05/17