I respect your posts and replies, firefop. They have merit.
I understand the enforcing aspect, but they have the rules written down nonetheless to cover their asses.
That's exactly it... no transit company would consider letting us install the device without UL because of the potential civil liability if one exploded and took out a bus full of passengers. Ultimately I blame the litigation system in the USA for this mentality.
I really don't have an issue with the rules (especially since they're opt-in rather than mandated)...
But then I agree that I wouldn't expect a bfl unit to burst into flames either. So maybe I actually agree with you that they should have gotten certification.