Greg was on the right track. The changes to Article 695 was to put it in line with NFPA 20: Standard for the Installation of Stationary Pumps for Fire Protection. If you would dig into the1999 NFPA 20 and it's ROP, you would find the voltage drop requirement is to prefer the pump relay from dropping out and causing "relay chatter". That would be rather narwlly sounding on a big pump not to mentioned the lost of the pump in an emergency
