Trying to regulate 5V across 14Ga wiring isn&#x27;t anything anyone would do. If 48V became some sort of DC standard then devices would work off 48V. That might not make sense of course and how much sense it might make could depend on line voltage (120V vs 240V).<p>There is a cultural thing here too. If you live in a place where all heating is done with combustion then there is no particular reason so not do everything with low voltage DC. Now that lighting is LED based there wouldn&#x27;t be anything that would need the higher voltage and power.