English – MEDC BG2 User Manual

Page 3

English

INTRODUCTION
These manual fire alarm call points have been designed for use in flammable atmospheres and harsh environmental

conditions. The GRP enclosures are suitable for use offshore or onshore where light weight combined with a high

level of corrosion resistance is required.

2. INSTALLATION
General
The unit should not be installed where it may be subjected to mechanical and thermal stresses or where it may

be attacked by existing or foreseeable aggressive substances.
The unit has been designed such that it does:

• Not give rise to physical injury or other harm due to contact.
• Not produce excessive surface temperature, infra-red, electromagnetic, ionising radiation.
• Not have non-electrical dangers.

When installing and operating explosion-protected equipment, requirements for selection, installation and

operation should be referred to eg. IEC 60079-14 worldwide 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 unit should be mounted on a vertical surface using the four fixing holes in the base.
MEDC recommend the use of M5 stainless steel screws.

Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Unscrew the 4 off captive screws holding the lid to the base.
Lift the lid away from the base.
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 manual 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 con-nection where local codes or authorities permit or require such a

connection.
Once termination is complete, carefully push the lid back onto the base. Tighten the 4 off screws evenly. Ensure

the lid seal is correctly seating in its groove during re-assembly.

3. OPERATION
The operating voltage of the unit is stated on the unit label.
The unit is operated by the breaking of the glass. Due to the design of the unit, there is no need to use a hammer

and the operator is protected from the broken glass by the vinyl glass label.

11/07