What ga. power wire - DFWstangs Forums
 
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post #1 of 16 (permalink) Old 09-20-2007, 12:38 AM Thread Starter
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What ga. power wire

I am going to put an 240 watt amp im my truck. Is 10ga. wire bug enough to power it. How big of a fuse do I need?
TIA

JOSH
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post #2 of 16 (permalink) Old 09-20-2007, 01:04 AM
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that will be fine... if its going to be a really long run like 20'+, you might want to step up to 8ga

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Last edited by jakesford; 09-20-2007 at 01:31 PM.
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post #3 of 16 (permalink) Old 09-20-2007, 07:21 AM
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If you plan on adding amps or upgrading later, go ahead and install bigger power wire now. Otherwise, I'd probably go ahead and use 8ga anyway. 10ga is very small.

Hell, I use 8ga for speaker wire to my subs, lol.

If it is your only amp, just use whatever size fuse that amp calls for. Check the manual, and if you don't have one check for it online. Some amps also have external fuses, so you can just match that.
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post #4 of 16 (permalink) Old 09-20-2007, 07:58 AM
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The amp probably uses a 25a fuse if it's 250rms. maybe a 15 if it's 250 max.

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post #5 of 16 (permalink) Old 09-20-2007, 08:28 AM
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10G will be fine for that amp

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post #6 of 16 (permalink) Old 09-20-2007, 09:33 AM
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Bigger is better.
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post #7 of 16 (permalink) Old 09-20-2007, 09:47 AM
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O_H_L_M_S L_A_W j/k 10awg is fine @ <15ft. anything >15ft. warrants larger wire

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post #8 of 16 (permalink) Old 09-20-2007, 09:53 AM
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Quote:
Originally Posted by installaterGT03
O_H_L_M_S L_A_W j/k 10awg is fine @ <15ft. anything >15ft. warrants larger wire
LOL @ Ohlms law.
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post #9 of 16 (permalink) Old 09-20-2007, 11:31 AM
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who is Ohlm?

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post #10 of 16 (permalink) Old 09-20-2007, 11:53 AM
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Quote:
Originally Posted by GTPhreak
who is Ohlm?
That's Best Buy install lingo. As for the question of wire gauge I would spend the extra few bucks on #8 gauge, even more so if this is going to power sub(s).

Listen to the EW!

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post #11 of 16 (permalink) Old 09-20-2007, 01:27 PM
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From caraudio forums... Just for reference

Power Wire:

10 gauge: ~35 amperes
Class D (~70% efficiency) - <350 watts
Class A/B (~50% efficiency) - <250 watts

8 gauge: ~55 amperes
Class D (~70% efficiency) - <550 watts
Class A/B (~50% efficiency) - <400 watts

6 gauge: ~87 amperes
Class D (~70% efficiency) - <875 watts
Class A/B (~50% efficiency) - <625 watts

4 gauge: ~140 amperes
Class D (~70% efficiency) - <1400 watts
Class A/B (~50% efficiency) - <1000 watts

2 gauge: ~220 amperes
Class D (~70% efficiency) - <2200 watts
Class A/B (~50% efficiency) - <1500 watts

1/0 gauge: ~350 amperes
Class D (~70% efficiency) - <3500 watts
Class A/B (~50% efficiency) - <2500 watts

2/0 gauge: ~440 amperes
Class D (~70% efficiency) - <4400 watts
Class A/B (~50% efficiency) - <3000 watts

4/0 gauge: ~700 amperes
Class D (~70% efficiency) - <7000 watts
Class A/B (~50% efficiency) - <5000 watts

Speaker wire:

22 gauge: ~2.2 amperes
8 ohms - <36 watts
6 ohms - <27 watts
4 ohms - <18 watts
3 ohms - <13.5 watts
2 ohms - <9 watts
1 ohm - <4.5 watts

20 gauge: ~3.4 amperes
8 ohms - <96 watts
6 ohms - <72 watts
4 ohms - <48 watts
3 ohms - <36 watts
2 ohms - <24 watts
1 ohm - <12 watts

18 gauge: ~5.5 amperes
8 ohms - <240 watts
6 ohms - <180 watts
4 ohms - <120 watts
3 ohms - <90 watts
2 ohms - <60 watts
1 ohm - <30 watts

16 gauge: ~8.7 amperes
8 ohms - <600 watts
6 ohms - <450 watts
4 ohms - <300 watts
3 ohms - <225 watts
2 ohms - <150 watts
1 ohm - <75 watts

14 gauge: ~13.7 amperes
8 ohms - <1500 watts
6 ohms - <1125 watts
4 ohms - <750 watts
3 ohms - <563 watts
2 ohms - <375 watts
1 ohm - <188 watts

12 gauge: ~21.8 amperes
8 ohms - <3800 watts
6 ohms - <2850 watts
4 ohms - <1900 watts
3 ohms - <1425 watts
2 ohms - <950 watts
1 ohm - <475 watts

10 gauge: ~34.6 amperes
8 ohms - <9600 watts
6 ohms - <7200 watts
4 ohms - <4800 watts
3 ohms - <3600 watts
2 ohms - <2400 watts
1 ohm - <1200 watts

8 gauge: ~55 amperes
8 ohms - <24000 watts
6 ohms - <18000 watts
4 ohms - <12000 watts
3 ohms - <9000 watts
2 ohms - <6000 watts
1 ohm - <3000 watts

These are based on 20' lengths... as the length of a cable increases the resistance will increase which will cause a higher current draw, and warrants a larger ga. wire.

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post #12 of 16 (permalink) Old 09-20-2007, 08:51 PM Thread Starter
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Thanks for the info, This is going in a 93 reg cab Z71. I bought some cheap ass set up from a buddy for $30. It is 2 off brand 8s with a legacy 240 watt amp. Looks like a traders village special.

JOSH
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post #13 of 16 (permalink) Old 09-22-2007, 11:27 PM
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Quote:
Originally Posted by alvarado gt
Thanks for the info, This is going in a 93 reg cab Z71. I bought some cheap ass set up from a buddy for $30. It is 2 off brand 8s with a legacy 240 watt amp. Looks like a traders village special.
sounds good. you'll want a 8ga wire b/c trust me when i say you'll want to upgrade that setup

i'll give it 4 months before the woofers are destroyed. combination of distortion from the amp and the pure quality of the subs lol

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post #14 of 16 (permalink) Old 09-28-2007, 07:31 AM
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Quote:
Originally Posted by EW
Bigger is better.
Agreed.

In case you want to upgrade later, or add amps, you dont have to re-run new wire.
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post #15 of 16 (permalink) Old 09-28-2007, 08:20 AM
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Stinger has a new 3ga and 3/0ga! Super flexible and oval shaped
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post #16 of 16 (permalink) Old 09-28-2007, 03:36 PM
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Quote:
Originally Posted by EW
Stinger has a new 3ga and 3/0ga! Super flexible and oval shaped
jeeze...

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