That's not quite correct. Any building in an industrial area could conceivably get three-phase power if it's on the poles along the road, not just large factori

That's not quite correct. Any building in an industrial area could conceivably get three-phase power if it's on the poles along the road, not just large factories. My friend owns a small manufacturing shop (probably 6k to 8k square feet with less than 10 employees), and he has three-phase power. Also, all buildings in the US/Canada have split phase power, not just businesses like laundromats and restaurants. Split phase is one of the three 240 V phases split into two 120 V lines. Electric ranges, dryers, and baseboard heaters in residential buildings commonly use 240 V by utlizing both 120 V lines.