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EWIS – Emergency Warning and Intercommunication System

Last modified: July 9, 2019
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From Spectrum Fire and Security website

The Emergency Warning Systems can be categorized as either:

  1. A Building Occupant Warning Systems (BOWS)
  2. A ‘Sound Systems and Intercom Systems for Emergency Purposes’, previously referred to as an Emergency Warning and Intercommunication System (EWIS)

An Emergency Warning System will consist of the following:

  • A manual and automatic alarm activation
  • An alert signal, which will include an audible signal, or a combination of audible and visible signals (lights/strobes) in areas of high noise. After a pre-determined period of time, the system will automatically switch to an ‘Evacuation’ signal.
  • An evacuation signal, which will include an audible signal, or combination of audible and visible signals, along with automated voice messages instructing the necessary evacuation procedure.
  • Ability to allow authorized Fire Wardens or emergency responders to take control and broadcast a verbal emergency public address to all or selected areas of the building via the PA loudspeakers.
  • Ability to take manual control of the system if required by authorized Fire Wardens or emergency public responders
  • Ability to communicate to one or more Wardens via the Warden Intercommunication Points – EWIS system only

The main point of difference between a Building Occupant Warning Systems and an Emergency Warning and Intercommunication System is the ability to engage in two-way communication via the Warden Intercommunication Points (WIPs). The Building Occupant Warning System does not have this functionality, whereas the Emergency Warning and Intercommunication System does.

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