Does anyone know of how many of these units were sold?. At 30VDC, how many appliances were ever made for this system? Were they(the appliances) made by DELCO, for the system?. Even comes with it's own switchboard!!. I'm impressed.
Collectors of old vacuum tube AM radio sets sometimes come across sets designed to operate off of 32V DC. Problem usually is that these sets had normal looking 120V 2 prong plugs, and subsequent owners (like someone inherits gramdma's radio) plug them into 120V AC thus blowing them up....
Once my brother acquired some 32V or was it 48V light bulbs. They had the usual edison base 120V bulbs have, and I thought they were regular 120V bulbs. Flash---pop! Thing is he stored them with the 120V bulbs, and were unmarked.... How was I supposed to know!
Maybe TrainWire could verify this, but I think lower-voltage medium-based incandescent lamps are currently sold for rail use. [Maybe ]www.gelighting.com]
[Note that lamps themselves {filament or discharge} aren't UL labeled.]
Off topic—but on the other end of voltage, there are medium-based lamps produced with a 277V rating, like for the odd janitor’s closet fixture in a public building. Replace one of those with a 120V lamp and see what happens. :-/ :-/ :-/ You get a nice “one-shot” strobe light.