English – MEDC XB8 User Manual

Page 3

English

1.0 INTRODUCTION
This range of ruggedized, intrinsically safe and weatherproof beacons, intended for use in potentially explosive
atmospheres, has been designed with high ingress protection to cope with the harsh environmental conditions
found offshore and onshore in the oil, gas and petrochemical industries. When correctly installed, the XB8 will
operate safely and not give rise to any hazardous environmental conditions.

The unit is available in 12V and 24V versions and for gas groups IIB or IIC

The intrinsically safe xenon beacon has a tube energy of 0.5 Joules (IIB) or 0.4 Joules (IIC)

A lower cost, uncertified version is available for use in non-explosive atmospheres.

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. 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 XB8 should be directly mounted using the two fixing holes in the base of the enclosure.

The holes have been designed to accept an M6 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 3 off M5 screws (4.0mm A/F hexagon key) holding the cover assembly to the base.
The screws are captive and will be retained in the lens assembly.
Gently pull the lens assembly away from the base 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 replace the lens assembly back onto the base, avoiding damage to
the mating surfaces. Fully tighten the 3 off lens fixing screws (4.0mm A/F hexagon key). Ensure the O-ring is
correctly seated in its groove during re-assembly.

12/11