04/12/2025
Visual Alerting Devices (VAD's)
Recently, it has come to our attention that Visual Alerting Devices (VADs) have become a focus of fire alarm and building code compliance checks by several city and regional councils. VADs are used in workplaces where noise levels are high and hearing protection is routinely required, such as workshops, manufacturing floors, and sawmills. In these environments, visual alarms may be necessary in addition to audible alarms to ensure that workers can perceive an evacuation signal.
Clause 406.4 of NZS 4512:2021 – Fire Detection and Alarm Systems in Buildings – states that if hearing protection is routinely worn, audible alarms may not be sufficient for life safety. In such cases, visual alerting devices such as strobe lights or flashing beacons must be installed. Because NZS 4512 is a cited standard in the New Zealand Building Code under Clause F7 – Warning Systems, compliance effectively becomes a legal requirement where a compliant fire alarm system is necessary.
However, Clause 406.4 is not written directly into the Building Code. It is contained within NZS 4512:2021, the primary standard used by architects and fire engineers when designing new buildings or major refurbishments. This suggests that the requirement may apply mainly to new builds or significant renovations where a Code Compliance Certificate (CCC) is required.
In many workplaces, noisy tasks occur sporadically, and hearing protection is worn for only brief periods. Modern fire alarm systems are also deafening and can be heard through most standard hearing protection. In such cases, VADs may not be required.
WorkSafe NZ advised that determining Building Code compliance is not their role, but where hearing protection might prevent workers' hearing alarms, “reasonably practicable” controls should be applied, with VADs being one possible option.
If you believe VADs may be necessary, don't hesitate to get in touch with John Riddell, email [email protected] or check out www.securo.co.nz for assistance.