sparky,
A formal interpretation would be of no help in finding out the "why" as the NFPA requires that requests for a formal interpretation be submitted in a manner that will allow the NFPA to answer the question with either a "yes" or a "no". The only way that I know of would be to find the TCR (now known as ROP) and the TCD (now known as the ROC) for the proposal that became the rule.
Don(resqcapt19)
