Introduction; General Safety Messages And Warnings; Installation; Access To Terminals - Eaton CU1 Manuel Technique

1.0 Introduction

This range of combined sounders and beacons is intended
for use in potentially explosive gas atmospheres and 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.
The unit is available in two versions suitable for use in the
following ambient temperatures:
CU1-S Standard unit – Ex de IIB T4 (Tamb -50°C to +50°C)
IP66 and IP67
CU1-H High temperature unit – Ex de IIB T4 (Tamb -50°C
to +70°C) IP66 and IP67
The flamepaths, flare and body are manufactured
completely from a UV stable glass reinforced polyester.
Stainless steel screws and mounting bracket are
incorporated thus ensuring a corrosion free product.
Tapered and threaded flamepaths are used to overcome
the problems of assembly of parallel spigot flamepaths.
Units can be painted to customer specification and
supplied with identification labels.
2.0 General safety messages and
warnings
All instructions and safety messages in this manual must
be followed to allow safe installation of the device. The
device must only be installed and maintained by correctly
trained site personnel/installers.
I. To reduce the risk of ignition of hazardous
atmospheres and shock, do not apply power to the
device until installation has been completed and the
device is fully sealed and secured.
II. To reduce the risk of ignition of hazardous
atmospheres and shock, keep device tightly closed
when the circuit is energised.
III. Before removing the cover for installation or main-
tenance, ensure that the power to the device is
isolated.
IV. Following installation, test the device to ensure
correct operation.
V. Following installation ensure a copy of this manual is
made available to all operating personnel.
VI. When installing the device, requirements for selec-
tion, installation and operation should be referred
to e.g. IEE Wiring Regulations and the 'National
Electrical Code' in North America. Additional national
and/or local requirements may also apply.
VII. Cable termination should be in accordance with
specification applying to the required application.
MEDC recommends that all cables and cores should
be correctly identified. Please refer to the wiring
diagram in this manual (or separate diagram provided
with the unit).
Technical Manual for The coMbined Sounder and Xenon beacon – cu1 TM207 May 2020 www.eaton.com
Sounder and Xenon Beacon - CU1
VIII. Ensure that only the correct listed or certified cable
glands are used and that the assembly is shrouded
and correctly earthed.
IX. Ensure that only the correct listed or certified stop-
ping plugs are used to blank off unused gland entry
points and that the NEMA/IP rating of the unit is
maintained.
X. MEDC recommend the use of a sealing compound
such as HYLOMAR PL32 on the threads of all glands
and stopping plugs in order to maintain the IP rating
of the unit.
XI. A suitable sealing washer must be fitted to all glands
and stopping plugs fitted into the enclosure.
XII. The internal earth terminal, where fitted, must be used
for the equipment grounding and the external terminal,
if available, is for a supplementary bonding connection
where local codes or authorities permit or require such
a connection.
XIII. When installing the device, MEDC recommends the
use of stainless steel fasteners. Ensure that all nuts,
bolts and fixings are secure.
XIV. The unit should be positioned such that debris, dust
or water cannot settle in the re-entrant horn.

3.0 Installation

The unit is mounted via the 2 off Ø9mm fixing holes in
the U-shaped stirrup/mounting bracket. If required, the
unit can be initially placed via the Ø13mm central hole in
the stirrup. The unit can then be rotated to the required
position and fixed via the other holes.
The two fixing holes have been designed to accept an M8
screw or bolt.

Access to terminals

Unscrew the 3 off M5 screws (4.0mm A/F hexagon key)
holding the cover assembly to the base. The screws are
retained in the cover. Remove cover to gain access to the
interior of the terminal chamber.
Once termination is complete, carefully replace the cover
back onto the enclosure, avoiding damage to the mating
surfaces. Evenly tighten the 3 off M5 screws (4.0mm A/F
hexagon key) in the cover, ensuring the maximum torque
value for the cover screws is observed, as marked on the
Ex e cover. Ensure the O-ring is correctly seated in its
groove during re-assembly.
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