How do you not come to the conclusion that 18" or less of wire does not need to be fused? It's the rule. Otherwise it would be different, like I mentioned. How do you not come to this same conclusion? What other conclusion is there? Correct, it does not say explicitly that a fuse is not needed, but what other conclusion can you come to as long as it's within 18"? Please explain this to me, as I am clearly missing it.
Regardless, I am now going to try a different approach, math, to prove that it is totally safe to not fuse something within 18". Well, I am not going to do all the math myself, but I will link to a calculator that does the math for me. This is just one of many out on the net, but the math is sound.
So according to this calculator, in my car where I have an UNFUSED 18" 4awg wire, I can pass 1400 amps at 13.85v DC down that wire. 1400 amps. And at 1400 amps, I only loose 4% of the voltage. That's not even talking about where the wire will got hot and catch on fire. That is WAY more that then 600 amps my battery puts out when it was brand new and also WAY more than what my alt puts out. So because the 18" piece of wire can handle WAY more power than what ANYTHING in my car can put out, I am TOTALLY safe and I will NOT cause any fires. Period. I DO NOT need a fuse. Not only are there industry standards that say I don't need a fuse within 18", the math also proves this.
The one caveat to this is that you are using good quality, properly sized wire. If you are not using the right size wire, all bets are off. In my case I am using a properly sized, good quality wire, so I am totally safe. I WILL NOT CAUSE ANY FIRES OR ANY OTHER SORT OF HARM TO MY CAR. Period.
Now, I keep saying this and everyone keeps missing it it seems, but it DOES NOT HURT TO FUSE. At all. Fuses are good! Fuse away if you feel the need. All I am trying to get across is that it is NOT a safety issue, it is NOT a fire issue, and it will NOT hurt anything if you don't fuse a wire that is 18" or less. That is all. I am just giving factual information. And I can't stress enough that fuses are good!
Now about fusing the wire only and not the devices... I am going to use an example that everyone has in their home to prove that it is industry standard to fuse the wire, not the device. Just walk over to your breaker panel in your home/apt and take a look. All of those breakers are NOT fusing ANY devices at all. NONE. I don't know about you, but I do not have ANY device in my house that will draw 15amps. The most I have is something that draws 13 amps. So how does a 15 amp breaker protect a device that only draws 13 amps? What about my phone charge that only draws 1 amp, how does that 15 amp break protect it? It doesn't and it simply can't. It ONLY protects the wiring. This is industry standard. But just for kicks and giggles, here's a link saying the same thing:
1st paragraph states the same thing. And this was basically the first google link. I could find more links, but it's not really needed to prove my point. Just google it for yourself. AC, DC, 12v, 480v, it doesn't matter. You fuse based off of the wire, nothing else.
I don't correct someone on a forum unless I know and can prove that I am right, like I just did. I don't really care what people think, or feel, or what they do for a living, or really what experiences they have had. That means nothing compared to actual facts and math and things that are provable. So lets please stay focused on facts and math and leave opinions, experience, and emotions out of this debate.
Edited by eulogious, 31 December 2013 - 02:15 PM.