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Originally Posted by OvenMaster
Do any of these buildings have human staff of any significant number? Sure, there's no hum on anything, but how do they heat up their lunches if they can't fire up a microwave oven? These can't be residential buildings. Try and find any DC-only kitchen appliances.
Tom
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Some equipment using switching power supplies might be able to run off of 120VDC. Though most such supplies expect to see 120V RMS, which when bridge rectified and capacitor filtered, see about 160VDC before it hits the high frequency chopper/transformer. SOme switching power supplies can run on anything between 100V to 240VAC, but a switching power supply fed 120VDC would have to be designed to accept 85V AC. SOme *might* still work on that...
Besides, that DC from ConEd probably isn't that pure. It's likely to just be rectified AC. Maybe from a 3 phase AC supply, so the low points don't hit zero. (the next positive phase waveform takes over before the first phase's zero crossing). Full of ripple.