MEDC CU1 Manual De Instrucciones página 3

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1. 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 gas groups.
CU1-S STANDARD UNIT – EExde IIB T3 (Tamb –50°C TO +50°C).
CU1-H HIGH TEMP UNIT – EExde IIB T3 (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. 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.
The CU1 is mounted via 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 2 fixing holes have been designed to accept an M8 screw or bolt. MEDC recommend the use of stainless
steel screws or bolts.
The elevation of the unit can be adjusted by loosening the 2 off M6 screws which fasten the stirrup to the body.
The unit can then be adjusted by rotating to the required position and then tightening the M6 screws.
The CU1 should be positioned such that debris, dust or water cannot settle in the re-entrant horn.
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Unscrew the 3 off M5 captive screws holding the cover to the unit. Carefully remove cover 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 unit 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.
© MEDC 2010 11/10