Eaton Crouse-Hinds MEDC SM87BG Manuel Technique page 5

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
A red high intensity LED can be fitted for alarm indication
when ordered from MEDC. As standard the LED is not
provided with over current protection. The forward current
(If) should be limited to 20mA.
When installing and operating explosion-protected
equipment, requirements for selection, 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 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.
A red high intensity LED can be fitted for alarm indication
when ordered from MEDC. As standard the LED is not
provided with over current protection. The forward current
(If) should be limited to 20mA.
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
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 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.
Once termination is complete, carefully push the cover
assembly back onto the base, avoiding damage to the
mating surfaces. Ensure that the retaining strap is not
trapped between the mating surfaces and that the o-ring
is correctly seated in its groove. Ensure the retaining
strap and wires are clear of the microswitch actuator
and operating mechanism. Replace the 4 off M6 screws
(5.0mm A/F hexagon key) into the holes in the cover
assembly and tighten evenly. Ensure the maximum gap
of 0.15mm is maintained between the cover and the base
once assembled.
Purchaser/Customer should make Eaton aware of any
external effects or aggressive substances that the
equipment may be exposed to.
Ensure equipment is protected from direct dust laden
airflow which may cause charge transfer.
Call points sM87BG/pB TM146 January 2023 www.eaton.com
Call points SM87BG/PB
English
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