What is L3 fire alarm?
What is L3 fire alarm?

How a fire alarm system works?

The passage of smoke into the chamber causes the light from the source to be scattered and fall on the photo cell, the cell output being used to initiate an alarm. The light scattering and light obscuring detectors both, detect visible smoke.

What does 4th alarm fire mean?

For example, a code commonly used throughout the US was four rings, a pause, and another four rings (known to fire alarm specialists as "Code 4-4" or simply "4-4") to indicate a particularly intense fire, giving rise to the phrase "four alarm fire".

What are zone types?

The number can specify the level of use, or it may indicate a certain amount of acreage or square footage for that particular property.

  • Residential Zoning. Residential zones can include:
  • Commercial Zoning.
  • Industrial Zoning.
  • Agricultural Zoning.
  • Rural Zoning.
  • Combination Zoning.
  • Historic Zoning.
  • Aesthetic Zoning.

How do I know if my fire alarms are interlinked?

Most alarms have a test push button as standard. Press this test button for approximately 5 seconds and the alarm should sound. If the detectors at the property are interlinked, they too will also sound. Any smoke alarms that do not sound should be investigated immediately.