Overview - ISO 15858:2016 (UV-C Devices - Safety information - Permissible human exposure)
ISO 15858:2016 defines minimum human-safety requirements for the use of UV‑C (UVC) lamp devices used for air and surface disinfection. The standard covers in-duct UVC systems, upper‑air room UVC fixtures, portable in‑room disinfection devices and any UVC equipment that may cause human exposure. It does not apply to UVC products intended for water disinfection. Key goals are to limit ocular and skin exposure, specify measurement and assessment methods, and prescribe control measures such as PPE, signage and training.
Key technical topics and requirements
- Permissible exposure limits: Adopts NIOSH REL / ACGIH TLV guidance - maximum permissible UVC exposure at 254 nm is 6.0 mJ/cm² for an 8‑hour day (tabled values show corresponding irradiance and permissible exposure times).
- Sources and use cases: Defines in‑duct systems, upper‑air fixtures and portable in‑room devices and describes UVC behavior (low penetration, reflection from some surfaces, transmission through certain materials).
- Measurement and instrumentation:
- Use radiometers/radiometers compliant with EN 14255‑1.
- Hand‑held sensors tuned to ~240–270 nm for on‑site checks; 254 nm‑selective radiometers for eye‑level measurements.
- Eye‑level measurement height specified (approx. 1.83 m–2.13 m / 6.0–7.0 ft) and guidance on measurement locations and frequency (commissioning, lamp replacement, system modification).
- Thresholds & commissioning:
- Procedures for measuring and comparing effective irradiance against exposure limits.
- Actions required when readings exceed limits (e.g., deactivation until adjustments or manufacturer advice).
- Controls and PPE:
- Requirement for UV‑resistant eyewear (comply with EN 170) and skin‑covering clothing when exposures exceed permissible levels.
- Signage and marking of areas subject to UVC exposure.
- Training and communication: Personnel must be informed about measured exposure levels, risks and safe work practices.
Practical applications and who uses this standard
ISO 15858 is used by:
- HVAC designers and building engineers specifying in‑duct UVC for coil/air sanitation
- Facilities managers and infection‑control teams selecting upper‑air or portable UVC units
- Safety officers performing commissioning, risk assessments and routine UVC monitoring
- Manufacturers of UVGI equipment for labeling, instructions and safer product design
Practical benefits include consistent measurement methods, clear exposure limits for occupational safety, and guidance to reduce acute ocular and cutaneous effects.
Related standards and references
- EN 170:2002 (UV filters for eye protection)
- EN 14255‑1:2005 (measurement of personal exposures to UV)
- CDC/NIOSH REL and ACGIH TLV guidance (adopted exposure limits)
- CIE reviews cited for long‑term risk assessment
For safe UV‑C deployment, follow ISO 15858 measurement, PPE and training recommendations alongside local occupational regulations.
