ISO 8201:2017

Overview

ISO 8201:2017 - Alarm systems - Audible emergency evacuation signal - Requirements - defines a standardized, unambiguous audible evacuation signal for buildings and outdoor reception areas. The standard specifies two primary acoustic parameters (the temporal pattern and sound pressure level) so that occupants recognize immediately that an emergency (fire, gas leak, explosion, radiation, etc.) requires immediate evacuation. ISO 8201:2017 does not prescribe spectral content (frequency) of the sound and is not applicable to vehicle sirens, shipboard alarms or public disaster-control signals.

Key topics and technical requirements

• Temporal pattern (three-pulse):
  • “On” (a): 0.5 s ±10%
  • “Off” (b): 0.5 s ±10%
  • Repeat once, then “On” (a): 0.5 s ±10% followed by “Off” (c): 1.5 s ±10%
  • Total cycle ≈ 4 s ±10%
  • Examples: steady tones, two‑tone high/low, frequency sweeps, or single‑stroke bell (acceptable alternative with specified timing).
• Sound pressure level (SPL):
  • During “on” phases, A-weighted SPL (Fast) must exceed the averaged background noise (60 s) by at least 10 dB and be ≥ 65 dB throughout the reception area.
  • To rouse sleeping occupants: ≥ 75 dB at bedhead with doors closed (note: may not awaken all occupants).
• Duration and control:
  • Minimum continuous activation: 180 s.
  • Permitted interruption: silence for ≤ 15 s for voice announcements or orientation.
• Supplementary voice messages:
  • Pattern repeated three times, then prerecorded voice instruction (allocated 4–12 s), followed by final off period (4–8 s); complete cycle ≤ 30 s.
• Visual and tactile signals:
  • Required where background noise averages >110 dB.
  • Temporal pattern must be imposed on tactile signals; visual signals must consider epileptic seizure risks.
• Use restrictions: Only for immediate evacuation; not for relocation-in-place strategies or non-evacuation responses.

Applications and users

ISO 8201:2017 is intended for use in:

• Buildings: schools, hotels, residential blocks, hospitals, offices, factories, public institutions
• Outdoor reception areas

Primary users:

• Fire protection engineers and alarm system designers
• Building and facilities managers
• Architects and consultants specifying life-safety systems
• Alarm manufacturers and installers
• Safety regulators and code authorities

Implementing ISO 8201 helps ensure consistent, recognizable evacuation alarms, aids integration with voice alarm systems, and supports accessibility via supplemental visual/tactile signals.

Related standards

• ISO 7731 - Auditory danger signals
• ISO 11428 - Visual danger signals
• ISO 11429 - System of auditory and visual danger signals
• IEC 61672-1 / IEC 61672-2 - Sound level meter specifications and tests

Keywords: ISO 8201:2017, audible emergency evacuation signal, evacuation signal temporal pattern, sound pressure level, fire alarm, voice alarm, visual tactile signals, alarm system standard.