What is the primary function of IS 928?

It specifies the standard construction, materials, and testing parameters for traditional hand-operated or electromechanical fire bells.

Are mechanical fire bells still relevant under modern codes?

Yes, they are still used in specific industrial, marine, or hazardous environments, or as manual backups where modern electronic sounders might fail or be unsuitable.

IS 928

: 1984

Specification For Fire Bells

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard lays down the requirements regarding materials, dimensions, construction, and performance criteria for fire bells used to sound alarms during fire emergencies. It is utilized by fire safety engineers and manufacturers to ensure reliable mechanical or electromechanical warning systems.

Specification For Fire Bells

Quick Reference Values

Nominal gong sizeTypically 250 mm

Minimum sound levelUsually 65 dB to 90 dB depending on operating distance

Practical Notes

While modern electronic fire alarm sounders are more common, mechanical fire bells are still specified in certain heavy industrial applications due to their rugged durability and distinct frequency.

Ensure that the material used for the gong matches the environmental conditions (e.g., highly corrosive environments) to prevent rusting, which can severely dampen the acoustic output.