Caper: I did as well, and I am sure that there are many jurisdictions around the country who have a rule in place that covers this. Article 511 covers commercial garages and is not to be considered here,
I am talking about a residential garage. Let's spill gasoline on the garage floor in that, or any other garage, and see what could happen when a spark ignites the puddle!
The NEC is without a specific rule on this, but common sense and field experience by qualified persons, and those who understand electrical systems and inspections (not political hacks) must be considered.
