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Old 02-17-2009, 08:20 PM   #1
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Audio amp wiring...


I was replacing a power cord to my amp (very small) and found that the neutral was fused and switched...why would that be?

Should I fuse the hot and switch the hot instead?

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Old 02-17-2009, 08:37 PM   #2
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Audio amp wiring...


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Originally Posted by rgsgww View Post
I was replacing a power cord to my amp (very small) and found that the neutral was fused and switched...why would that be?

Should I fuse the hot and switch the hot instead?
Are you sure it was the neutral? But overall, inside the equipment, it really doesn't matter. The switch and fuse aren't there to protect personnel, and without opening the case you can't expose yourself to the live circuitry inside. And even if it were wired to the hot, if you open the case, you are still exposed to live parts...

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Old 02-17-2009, 08:54 PM   #3
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Audio amp wiring...


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Originally Posted by InPhase277 View Post
Are you sure it was the neutral? But overall, inside the equipment, it really doesn't matter. The switch and fuse aren't there to protect personnel, and without opening the case you can't expose yourself to the live circuitry inside. And even if it were wired to the hot, if you open the case, you are still exposed to live parts...
Unless the color codes are incorrect, the old cord came into the unit, was wrapped through a ferrite core, and heatshrinked right before the splices. Opening the splices I found the white wire going into the fuse holder, out the holder to a switch, after the switch to another splice, with one wire going to a varistor and a white going to the toroidal x-former. Black was just spliced with a wire going to the varistor and a wire going to the x-former.

It just makes more sense to switch and fuse the hot...

I might take the varistors out, they are there for surge protection...but I already have one. My surge protector would divert a surge into the neutral, but then the varistors inside the unit would divert it back into the hot.
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Old 02-18-2009, 08:26 AM   #4
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Audio amp wiring...


I've run across this as well. It used to be that products had good quality control and things were manufactured properly. These days no telling what they will do! Someone wired it incorrectly and they don't care!

BTW the reason I was taking a new product apart was because it was not working as it should have been. I do this a lot lately - buy something and have to fix it to get it to work... (Glad I know how to fix things!)
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Old 02-18-2009, 10:55 AM   #5
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Audio amp wiring...


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Originally Posted by Billy_Bob View Post
I've run across this as well. It used to be that products had good quality control and things were manufactured properly. These days no telling what they will do! Someone wired it incorrectly and they don't care!

BTW the reason I was taking a new product apart was because it was not working as it should have been. I do this a lot lately - buy something and have to fix it to get it to work... (Glad I know how to fix things!)

I was doing a "audiophile-ish" mod. Replacing the cord with a 12 awg solid one.

I might get an emi filter rated for 5 amp (my unit has a 4 amp slow blow fuse) and wire that in...
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