I have a customer who wants to be able to tie-in a portable generator into the service. They do not want to spend money on a transfer switch. We're talking about an 800 amp, 480/277 volt service. I was looking at article 702 and wasnt sure about 702.5 exception and from what Im understanding, I can lockout the main breaker and some how tie-in the generator into service. The "only qualified persons service the installation" part is questionable as always, although they will definitely have an EC make connections when the time comes. Another thing in question is the "portable generator", it is a tractor-trailer sized generator that is hitched and transported. This corp. has several locations in this region and can get the generator on site within a few hours. Am I missing something? Any advice would be appreciated, Ill be bidding against others and I know this company will take the cheapest route, so if this can truly be accomplished without the pricey transfer gear, that will surely be a winner.