I am reviewing drawings from an Engineer that screwed up big time (undersized equipment, bad calcs etc). The incoming service is 120/240V 3PH-4W. Am I to assume that it is a delta system? I typically see 120/208V system. What made me question it is because the engineer has no loads on the B leg. I checked the new service order from the power company to bring the power into the building and it only says 600A 3PH 4W 120/240V.