MEDC SM87BG Manual Tecnico página 3

English
1.0 INTRODUCTION
These manual fire alarm, emergency shutdown breakglass and pushbutton units have been designed for the
most arduous environmental conditions. The units are both easy to install and maintain. A choice of either
stainless steel or alloy makes the range suitable for both the offshore and onshore industries.
The units are available with the following options and features:
Lift flap
Duty label
Tag label
Earth continuity via internal/external earth studs
LED
End of Line and Series resistors and diodes
Switches (two switches, four poles maximum)
M20 or M25 gland entries in a range of positions, with a maximum of four
Optional momentary or latching with key reset actions
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.
These alarm call points are designed to be directly mounted using the 4 off 9mm holes in the base of the unit.
Units may be mounted to vertical, horizontal or angled surfaces.
The holes have been designed to accept an M8 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 4 off M6 screws (5.0mm A/F hexagon key) holding the cover assembly to the base.
Keep in a safe, accessible location.
Twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away from the base. Remove to
gain access to the interior.
Cable termination should be in accordance with specifications applying to the required application. MEDC rec-
ommends 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 call point 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.
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© MEDC 2015 07/15