ISO 15727:2020 UV-C devices — Measurement of the output of a UV-C lamp.
6 Safety issues
6.1 General
This clause addresses basic safety issues that relate to UVGI systems, The basic safety shall he in accordance with ISO 15858. Some aspects have regulations while others are recommended or represent current industry practice.
6.2 Protective clothing and eyewear
It is not recommended that any personnel be subject to direct (JV-C exposure, hut in the event such exposure is likely, personnel shall wear protective clothing, including full coverage of exposed skin if possible and protection of eyes with eyewear. Gloves shall be used to protect the hands. Most eyewear, including prescription glasses, are sufficient to protect the eyes from IJV-C, but not all will offer complete coverage and standard issue protective goggles can be the most suitable alternative.
6.3 lW-C photodegradation of organics
Prolonged UV-C exposure can discolour or damage various types of organic materials and plants. In general, UV-C radiation will not only impact aesthetic effects, but also damage substances such as clothes, discolouring and embrittlement of plastic-coated wires with the result of potential fire hazard.
6.4 Ozone production
Ozone is a hazardous indoor pollutant that can be produced by the UV-C lamp. Some UV-C lamps are designed with a narrow spectral range of tJV-C output and produce little or no ozone. Other UV-C lamps, especially the more common UV-C lamps that produce a broad-range IJV-C spectrum, can produce enough ozone that it can be smelled in the indoor air. Ozone can cause damage to the lungs from prolonged or chronic inhalation and can also cause certain types of damage or degradation to materials. Although there are no known cases in which ozone produced by a UV-C lamp has caused any major health problem, the possibility exists and any undue levels of indoor ozone noted after a UV-C installation shall be investigated. Before testing, ozone sensors shall be set up to monitor the ozone leakage.
6.5 UV-C internal and external leakage
UV-C installations in an air handling unit (AHIJ) shall be designed so as to minimize the escape of UV-C through ductwork, gaps, and supply registers. Stray IJV-C emerging from an AHIJ installation can cause harm to individuals in the local area, including maintenance personnel and passers-by. Various options are available to reduce the leakage of UVC through ducting to supply registers, including the installation of light baffles (air vanes with multiple bends and painted black to absorb UV-C), the use of filters as light blocks, and the adjusting of register vanes to redirect light upwards.ISO 15727 pdf download.