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In Reply to: RE: Better point posted by twystd on June 07, 2016 at 22:31:18
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You can still complete the circuit with your other hand when the switch is off.
"You can still complete the circuit with your other hand when the switch is off."
How? FenderLover's schematic is correct. And FWIW, you're supposed to pull the line cord before replacing a mains fuse. No amount of precautionary wiring inside an amp can substitute for proper safety practices.
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Buy Chinese. Bury freedom.
"No amount of precautionary wiring inside an amp can substitute for proper safety practices."
That is certainly true, however there is the possibility (inevitability in my case) of a brain fart. If the fuse would have been wired after the switch I wouldn't have been shocked. Sometimes it's best to make things as idiot proof as possible, at least when it comes to safety.
twystd
The right type of power entry module can solve this problem for you. I haven't EVER been tempted to touch a metal fuse cap with the line cord plugged in. And just to cover all the bases, it is NOT safe to place the switch ahead of the fuse. Safety demands that the fuse should be the FIRST thing the hot mains wire is connected to.
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Buy Chinese. Bury freedom.
Fuses are simple and reliable. Switch contacts do get welded/arced together. I do a lot of electrical testing at work. Trust me, you don't want to bet your life on a switch or circuit breaker to actually shut of power.
So yes, fuse holder first. Fuse holders should have a line and load side. When in doubt check with the manufacturer.
When a switch arc welds itself on and the fuse is blown, it is no more dangerous than having the fuse first, in both cases if you are not smart enough to unplug the unit, there is a potential for shock when changing the fuse. The way around this is to not have an external fuse access..
What will happen if the switch arcs internally to the chassis? If you're lucky, the house breaker will blow quickly. If not, the internal green earth wire might open and you get electrocuted the next time you touch the amp. Or, maybe the earth wire stays good long enough for the wiring in the amp to catch on fire. Or the wiring in your house. Take a look at any UL equipment and you'll see that NOTHING precedes the fuse. This is what's required to protect users from defects and most mishaps.
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Buy Chinese. Bury freedom.
I don't think I'm getting this. You cannot get a shock from the fuse holder, IF the switch is off. If the switch is on... you can get a shock from the fuse holder, no matter if it's before or after the switch.If you are touching both the neutral and hot lines, you will get a shock. I'm wondering if the OP got a shock from the residual charge in the main PSU caps. This can happen no matter what position the switch is at.
Edits: 06/08/16
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