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Alarm Boxes

There must be at least one manual fire alarm box in each fire zone of the vessel. Framed charts or diagrams in the wheelhouse and fire control station, adjacent to the fire alarm receiving equipment, should indicate the locations of the fire zones in which the alarm boxes are installed.

Manual fire alarm boxes are usually located in main passageways, stairway enclosures, public spaces and similar areas. They should be readily available and easily seen in case of need. Manual alarm boxes must be placed so that any person evacuating a fire area will pass one on the way out.

All new alarm boxes must be clearly marked: IN CASE OF FIRE BREAK GLASS. Older alarm boxes not so marked must be identified with the same instruction printed on an adjacent bulkhead in 1.27-cm (1/2-in.) letters. Every alarm box must be numbered to agree with the number of the fire zone in which it is located. The box must be painted red, with the operating instructions printed in a contrasting color.

Newer boxes are equipped with an operating lever. When the lever is pulled, the glass is broken and the alarm box mechanism transmits the alarm. Older boxes may not have a lever; instead, they may have a small hammer, attached with a chain, to be used in breaking the glass. Once the glass is broken, the lever must be operated to sound the alarm.

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