Re: DC power supply grounding
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My whole life I have operated on the principal of a fuse is the first thing inline on the positive side after the source, switch, to the consumers. In some cases, DC, there may be a large fuse inline from source, switch or battery, that then branches off to other consumers. And those lines that go into separate consumers all have their own lower rated fuses. But never have I heard of fuses being in the return side or the negative side. Even though power, DC , runs from neg to plus side. Anyway, we are talking about the basic 120 circuit. I just looked up the circuit in my micro mark 7x16 lathe and sure enough, the fuse is located just after the switch on the power side.
george
On Sunday, December 31, 2023 at 06:50:44 PM PST, Tony Smith <ajsmith1968@...> wrote:
Correct, it DOES matter that the fuse goes on the HOT side.
You essentially have one in, and two outs.? Fusing one of the outs is not doing you any favours.
In this case you can blow the fuse, and power is still going through your device - that can cause much excitement if the device isn't grounded, or even if it is (hot chassis and all that jazz).
And for the love of god don't put fuses on both the live & neutral.? (And yes, I've seen fused earths, gotta cover all the bases to be extra extra safe, y'know.? Gah. See)
Tony
The fuse can only protect when there is only one path for a return current and fusing N does not protect L from returning on GROUND. Yes, it does matter where the fuse is.
The purpose of a fuse is to protect the wires and prevent a fire.? In that case it does not matter where the fuse is. ?
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Buffalo John
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