English – MEDC FB11 User Manual

Page 3

English

1.0 INTRODUCTION
These certiﬁed steady beacons have been designed for use in potentially explosive gas and dust atmospheres and
harsh environmental conditions. The glass reinforced polyester 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 indentiﬁcation labels.

2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements 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. 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 M5 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 Ø8.5mm mounting holes in the optional backstrap. These have been designed to accept an M8
screw or bolt

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 6 off M5 screws (4.0mm 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
recommends that all cables and cores should be correctly identiﬁed. Please refer to the wiring diagram provided
with the product.

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