My uncle bought an old house and barn and called me to rewire the barn. " Oh, I think the service drop across the driveway that feeds it needs replacing too" No kidding. The "service drop" was a piece of POTS wire, red and green for hot, black and yellow for grounded. Interior of the barn wired the same way. No boxes, just 2 wire receptacles screwed to the studs by the yoke. And not 1 thing had caught fire. Amazing.