MEDC SM87HXB - Manual (Page 3)

English
1.0 INTRODUCTION
These xenon beacon units have been designed for use in flammable atmospheres and harsh environmental
conditions. The marine grade alloy or stainless steel enclosures are suitable for use offshore or onshore, where
light weight combined with corrosion resistance and strength is required. The XBT model consists of two separate
units, the electronic assembly mounted in one unit and the xenon beacon tube assembly mounted in another,
thus enabling the tube assembly to be used in an ambient temperature of up to 85°C.
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements for selection, installation and op-
eration 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.
The beacon is mounted via the 4 off Ø9mm fixing holes in the base of the unit. The fixing holes have been
designed to accept an M8 screw or bolt.
MEDC recommend the use of stainless steel screws.
The unit has been designed and certified to operate at any attitude
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated and gas and/
or dust atmospheres are not present.
Unscrew the 4 off screws (5mm A/F hexagon key) holding the cover assembly to the base. Keep screws in a
safe accessible place as they are not retained in the cover.
Gently twist the cover clockwise and anti-clockwise whilst pulling it away from the base of the enclosure 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 beacon 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 lower the cover assembly back onto the base, avoiding damage to
the mating surfaces. Ensure the o-ring is correctly seated in its groove during re-assembly. Replace and evenly
tighten the 4 off cover screws. Ensure the required gap (0.15mm max.) is maintained between the cover and
the base.
© Cooper MEDC 2011 10/11