MEDC DB6 Manual Tecnico página 3

English
1.0 INTRODUCTION
This explosionproof bell is available in two voltages. The bell is manufactured from cast iron, with a painted
finish. Colour is to customer's specification
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements for selection, installation and op-
eration 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 bell is mounted via any combination of the 4 off Ø9mm fixing holes. 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
NOTE: To provide overloading protection, every unit must be installed with an in-line fuse rated 500mA.
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. The screws are
retained in the cover
Gently lift the cover assembly 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 bell 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 both mating faces of the Flamepath are smeared with a thin layer of copper grease (a
sachet of grease is supplied with each unit) before the cover is fitted. Ensure the required gap (0.2mm max.) is
maintained between the cover and the base.
© Cooper MEDC 2014 08/14