Hence, if you are charging a mobile phone, a short could occur at the phone, and your distribution system must protect the USB cable to the phone (as well as the rest of the wiring). The general rule is that ALL of the wire in EVERY circuit must be able to carry the 'maximum case' current, with the fuse/protection circuit tripping before the wire is damaged. Please note, I am only sharing my thoughts in good faith I take no responsibility for omissions or errors on my part.Īs already mentioned a high current supply can become very destructive if a short circuit fault occurs. I am sorry if the following looks pessimistic, but I would like you to carefully design your system and not get hurt. In addition, voltage drop across wires of appreciable length tend to be excessive in low voltage systems.
A vaporised wire is 'good outcome' compared to a fire, which is the more common result. Question: flaws in designing house wiring with 5vdc, in every room, nook and crevice, and 60 AMPS total for the whole house? Can it kill a device never expecting to get a possible sixty amps?Ī large shared power supply where all the loads are 'local' can make sense, but unfortunately there are a number of issues.Īs discussed above, high current sources can be destructive under fault conditions.
My Raspberry Pi 4, flat out squeals-bloody-murder, if not given a full 3 amps.Īs time goes on, USB-C devices that want to pull 3amps(+?) at 5vdc.įuture proof? 5vdc, and heaps of amps available. Newer phones request 2A, and whine when denied. Old USB devices that pull 1amp at 5vdc, no problem. If I understand Ohm's law correctly, no device will draw more than it needs? So my thought is, fuse protect it at the output, run low voltage wiring throughout the house, at 5vdc, put a standard USB outlet anywhere needed. I could power lots of USB devices for now, and decades to come, for an entire house. (adjustable, slightly, but nominal is 5). So I recently acquired from our local salvage yard, a power supply that can put out 5vdc.
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