Is there a threshold quantity of hydrogen for which some of the more common indoor safeguards may not be needed?

Documents such as NFPA 2, Hydrogen Technologies Code, and the International Fire Code have quantity thresholds that differentiate requirements for the design of systems and enclosures. However, even the smaller quantities present a hazard under specific conditions, especially for systems that have the potential to release hydrogen into a confined or unvented space. Good engineering judgement must be used regardless of the size of system. Also, the quantity of hydrogen connected to the system from outdoor storage must be considered in the overall design.