ULC 252A PDF
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- Helps evaluate accessories such as pressure gauges, flowmeters, relief devices, and shut-off valves used with compressed gas regulators.
- Provides a basis for judging accessory suitability in combination with a compressed gas regulator under UL/ULC 25
Scope Overview
- Covers minimum requirements for accessories intended for direct connection to the low- or delivery-pressure side of compressed gas regulators, but not for direct connection to high storage-cylinder pressures.
- Applies to accessories used with gases including air, carbon dioxide, inert gases, fuel gases, nitrogen, nitrous oxide, and oxygen; it excludes flow characteristics, physiological effects of medical-gas accessories, pressure-gauge and flow-indicator accuracy, and accessories covered by other UL standards.





