3 ms·
It's a bit of an arbitrary determination; 60V is the international common denominator on what various legal or civic (e.g. insurance) regulations consider safe;
by eqvinox 3y ago
It's a bit of an arbitrary determination; 60V is the international common denominator on what various legal or civic (e.g. insurance) regulations consider safe; https://en.wikipedia.org/wiki/Extra-low_voltage#Separated_or_safety_extra-low_voltage_(SELV) https://en.wikipedia.org/wiki/Extra-low_voltage#Separated_or...
48V is somewhat of a dinosaur from the days when you designed things with a 20% margin since that's what was cheaply attainable. Regular PoE is 54V these days (10% margin), and some more specific applications creep even closer to 60V. (I've seen 57V and 58.5V, which is of course 5% and 2.5%)
- dmix 3y agoWhat's a commonly produced thing that's 48v? I don't know much about this subject. Is it most industrial type stuff or is there consumer tier products using it?
- somedudetbh 3y agoebikes, phantom power in audio equipment...
- stephen_g 3y agoBasically the whole telco industry runs off 48V, and has for a very long time. You'd have a rectifier box that would take the AC and output 48V, and then everything would run from that. A lot of the satellite and wireless equipment I've worked on has inherited that and runs off 48 too.
- p1mrx 3y ago240W USB-C uses 48V, so that should eventually become common for stuff like gaming laptops.
- dharma1 3y agoPro audio - most condenser microphones (except electret) run off 48v provided via the mixer/audio interface through XLR cables