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Car audio fuse questiion

post #1 of 8
Thread Starter 
I'm not sure if there's a car audio forum, but I have a fuse question - I have an 8g power lead from my battery feeding a 50wRMS x2 Amp. The amp itself has a 7.5a fuse on it. I have an AGU-type fuse holder that I plan to install on the power lead near the battery. Using the (total RMS x 2 / 13.8) formula I get 14.5 amps. I was going to use a 15 amp fuse, but I'm a bit confused because the amp's built-in fuse is only 7.5.

Should I go ahead with a 15a fuse?

thanks, Jack
post #2 of 8
100 \ 13.8 = 7.2 Amps....how are you getting 14.5?
post #3 of 8
I would stick with the original fuse rating.
post #4 of 8
If the amp has its own fuse, then the one you are adding is redundant to the amp's need. Instead, your fuse will protect the wire against inadvertent shorts and such. The 15 amp fuse would be fine for that 8 gauge wire and allow addition of other devices that pull juice.
post #5 of 8
Quote:
Originally Posted by amirm View Post

If the amp has its own fuse, then the one you are adding is redundant to the amp's need. Instead, your fuse will protect the wire against inadvertent shorts and such. The 15 amp fuse would be fine for that 8 gauge wire and allow addition of other devices that pull juice.

An additional fuse at the battery isnt redundant in that it protects the circuit against a direct short between the battery and the amp.
post #6 of 8
Quote:
Originally Posted by jim19611961 View Post

An additional fuse at the battery isnt redundant in that it protects the circuit against a direct short between the battery and the amp.
I said it was redundant to *amp*'s need. The amp does not care about shorts upstream of it. If you had such a short, it would simply shut off since the effective voltage at its input terminal would be zero volts so no damage comes to it. The fuse therefore is for protection of the wire which is what I explained. Same idea is behind the breakers in your home AC panel. They are there for risk of fire from wires. Downstream equipment protection has to be provided by the device itself.
post #7 of 8
Quote:
Originally Posted by amirm View Post

I said it was redundant to *amp*'s need. The amp does not care about shorts upstream of it. If you had such a short, it would simply shut off since the effective voltage at its input terminal would be zero volts so no damage comes to it. The fuse therefore is for protection of the wire which is what I explained. Same idea is behind the breakers in your home AC panel. They are there for risk of fire from wires. Downstream equipment protection has to be provided by the device itself.

Your quite right (we both are). I read your post too hurriedly. Carry on......
post #8 of 8
Thread Starter 
Quote:
Originally Posted by SAM64 View Post

100 \ 13.8 = 7.2 Amps....how are you getting 14.5?

I was following the advice from a post on the website that I bought the amp from.

Sounds like I'm ok using the 15a fuse,.

Thanks guys.
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