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» Termpro Audio Forum » Component Specific Topics » Alternators, Batteries, Interconnects » wire ampacity ratings

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manauta
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I was just wondering does wire ampacity really come into play in mega high watt systems?

Wire AWG Ampacities @ 30° C Ambient
(Table 450-5b of NEC)

16 AWG 10 amps
14 AWG 15 amps
12 AWG 20 amps
10 AWG 30 amps
8 AWG 80 amps
6 AWG 105 amps
4 AWG 140 amps
2 AWG 190 amps
1 AWG 220 amps
1/0 260 amps
2/0 300 amps
4/0 405 amps

Say that you amplifier draws around 400 amps DC, would you need 4/0 wire for pos. and neg. power cable??

And if your output was say 75 volts and 51 amps, then would you need at least 8 AWG speaker leads??

Now my true question is this, what do you think would happen if you ran 4 awg power cables and 16 awg speaker leads for this amplifier??

Do you think that your output on this amplifier would decrease??

Because as an electrician I know that wire ampacity ratings are highly under rated. But in a house that could lead to fires and the such. But what would that do to a car stereo????

I was just wondering??

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Posts: 1054 | From: Crestview, Fl | Registered: May 2000  |  IP: Logged | Report this post to a Moderator
H-O-Alts-Rick
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The first thing that comes to my mind is that you will have a voltage drop and a loss becuase of it. Here is a couple of calculators to help you figure out how much that could be Click Here

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Posts: 1621 | From: Davenport Ia. | Registered: Jun 2003  |  IP: Logged | Report this post to a Moderator
Crazyjoker2
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Bigger/more wire will be better!

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Posts: 3427 | From: Shows from 909 to 208 | Registered: Jan 2003  |  IP: Logged | Report this post to a Moderator
   

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