Don't know about RI but down here in Texas our power company will not give you three phase at a residential location power unless you have a commercial application, even though repairing a classic seacraft could be considered one of the most important jobs in the world, I don't think any electrical provider would think that boat repair would warrant three phase service not only that but installing a three phase service from the meter loop on in is the responsiblity of the resident and is very costly. I would venture to say that he would be able to buy several compressors that would suite his application for the cost of a installing a three phase service.