What resources are available to better understand the challenges and risks of installing a facility near high-voltage lines? How far away should electrical classification

Previous versions of NFPA 55 listed overhead power lines within the separation distance tables with no voltage distinction. The separation distances were 15 ft for GH2 and 25 ft for LH2 for all overhead electrical lines. The current edition of NFPA 2 includes these in overhead utilities; the distance for GH2 and LH2 will vary with pressure and diameter of the hydrogen piping. In practice, high voltage overhead power transmission lines used larger distances for safety, but this was mainly due to the easement required for these lines that would exclude hydrogen (and other) systems. For safety, if a best practice was that if the failure of an uninsulated power line could touch the system, then the lines are too close. The UK has some distance criteria under ENA Technical Specification 43-8 Overhead line clearances.