Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair
“Performance
“CORSA"



Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Corvair Center Forum :  Corvair Center Phorum The fastest message board... ever.
Corvair Center 
OT - AWG vs GA or gauge
Posted by: OttawaCorvairGuy ()
Date: November 20, 2017 03:38PM

I am looking at 8ga wire to use as a power supply.

Those in the know. I did a search and read a lot of people's opinions and I still don't have a firm understanding. I know what AWG stands for.
However, I have two questions:
#1 - What is the difference (if any) between wire size of let's say 8 AWG vs 8 Gauge?
Question #2 - Is one better for a power cable / supply than another?

Thank you, Tony

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: MattNall ()
Date: November 20, 2017 03:42PM

AWG is WIRE GAUGE


GAUGE is for sheetmetal and shotguns...


American wire gauge (AWG), also known as the Brown & Sharpe wire gauge, is a standardized wire gauge system used since 1857 predominantly in North America for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258.
American wire gauge - Wikipedia
[en.wikipedia.org]





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: thewolfe ()
Date: November 20, 2017 03:43PM

They are the same. If someone is talking about 8 gauge wire, they are talking about 8 AWG. Power transmission cable is sized according to the amount of current the wire will be carrying and how far it will be traveling. What kind of current will your power supply be supplying?

Nate Wolfe
Portland OR
65 Corsa 180

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: OttawaCorvairGuy ()
Date: November 20, 2017 04:57PM

Thank you Nate.

I thought they might be the same size. But I was not 100% sure.
Some suppliers listed their wire as Battery cable 8 AWG. While other suppliers merely say 8ga wire and have NO listing for battery cable at all on their site.

FYI - This is not for the main battery cable. It is only to supply power to one circuit.

Thank you again for answering my questions.

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: ensys ()
Date: November 20, 2017 05:32PM

Now that we're on the same page, jargon-wise, this might be a good time to note that when it comes to primary wiring, the bigger the better.

In this case, if I'm not mistaken, the more usual gauge for a batt cable is more like a #4 or larger.

Just a thought...

Keep 'em flying...

S.J.Szabo

From America's
Automobile Heartland

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: OttawaCorvairGuy ()
Date: November 20, 2017 05:57PM

So 8GA and 8AWG are the same. Thus one is not better than the other.

Thanks....

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: MattNall ()
Date: November 20, 2017 06:04PM

correct..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: oldqmguy ()
Date: November 20, 2017 06:08PM

Yes, 8 gauge is too small for a main battery cable.

Keep in mind that the LARGER the AWG (gauge) number the SMALLER the wire!

This can be very confusing but is something we need to remember. The smaller the number the bigger the wire.

This matters because the wire size determines how much current can be carried safely in that wire.

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: OttawaCorvairGuy ()
Date: November 20, 2017 06:20PM

oldqmguy Wrote:
-------------------------------------------------------
> Yes, 8 gauge is too small for a main battery
> cable.
>
> Keep in mind that the LARGER the AWG (gauge)
> number the SMALLER the wire!
>
> This can be very confusing but is something we
> need to remember. The smaller the number the
> bigger the wire.
>
> This matters because the wire size determines how
> much current can be carried safely in that wire.
>
> Dale cool smiley


Thank you Dale.

IF you missed it.
My post the forth post from the top said: "FYI - This is not for the main battery cable. It is only to supply power to one circuit."

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: OttawaCorvairGuy ()
Date: November 20, 2017 06:31PM

BTW - it is not me. I'm not the one calling it battery cable. It is what some suppliers are calling it on their site.
While other suppliers do not even have a listing for battery cable and they happen to call all their wires - wire and not cable.

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: oldqmguy ()
Date: November 20, 2017 08:48PM

OttawaCorvairGuy Wrote:
-------------------------------------------------------
> BTW - it is not me. I'm not the one calling it
> battery cable. It is what some suppliers are
> calling it on their site.
> While other suppliers do not even have a listing
> for battery cable and they happen to call all
> their wires - wire and not cable.

I realize that it was not you that said it was a "Battery Cable" but had found it listed as such in a catalog! sad smiley

I was just pointing out that 8 AWG Wire was not a good size for a 'main' battery cable. If it is listed that way someone "might" try to use it that way, with very bad results! eye popping smiley

You should have no problem running one device on that cable (wire?). Maximum current rating for 8 AWG wire is 73 Amps (876 Watts at 12 volts). It is normally limited to 40 Amps (480 Watts) for safety. grinning smiley

That should handle whatever you are hooking up.

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: Bob Helt ()
Date: November 21, 2017 05:17AM

You should have no problem running one device on that cable (wire?). Maximum current rating for 8 AWG wire is 73 Amps (876 Watts at 12 volts). It is normally limited to 40 Amps (480 Watts) for safety. grinning smiley


Sometimes one is more interested in voltage drop across a wire or cable, and not so much in the current carrying ability.

Bob Helt

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: Frank DuVal ()
Date: November 21, 2017 08:22PM

The term "battery cable" might be used by the vendor to indicate low voltage wire, as opposed to more typical ratings of 300 volts or 600 volts for cables.

You have 12 volts, so not much worry about blowing holes in the insulation! grinning smiley

In general you do want more stands for wire used in vehicle applications, as it is more flexible, less resistant to breaking.

Frank DuVal

Fredericksburg, VA

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: rowin4 ()
Date: November 21, 2017 09:29PM

Ever sense I was a kid it's been a battery cable. after reading these postings I did a google search on [ when wire becomes cable ] thinking it was the size of the wire like 2 gauge or larger. To my surprise wire is wire, we have been mislead somewhere in the last 60 years or more to believe the WIRE from the battery is a cable. Not true!!!! A cable is a wire with a hot or multiple hot, neutral or ground wires together similar to household use. Something new learned today. Will I call a main battery wire a wire, probably not.

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: JamesD ()
Date: November 21, 2017 10:58PM

Car makers do not use AWG. They use SAE gauge wire. It's different, and AWG has 3-12% more ampacity for the same gauge size.

That's not a lot, mind you, but since all you will find is AWG wire, it doesn't matter much.

WireBarn has a useful wire size calculator. According to it, for a 5-foot run with a 150-amp draw with voltage drop under 2%, you should use #4 wire.

4AWG, 4 gauge, #4, it's all the same in common parlance.

James
'65 Corsa 4-speed, '65 Corsa V8                                                       Santa Clarita, CA.
“I may not always drive a car, but when I do, I prefer a Corvair.  Stay loose, my friends.”




Edited 1 time(s). Last edit at 11/21/2017 11:00PM by JamesD.

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: MattNall ()
Date: November 21, 2017 11:01PM

That's a Despicable piece of info!! LOL!!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: DAVECS1 ()
Date: November 22, 2017 01:04PM

What does make a huge difference is strand density and the the insulator. The better mobile use wire, uses a Cross link polyethelyene covering. This will hold up to things like UV, heat, and many chemicals. Many of your older wiring or inexpensive wire is a type of nylon, teflon, or poly vinyl chloride, type covering, and will degrade in sunlight or conditions over 150F degrees.

In mobile equipment wire it is a fine balance between the size of the multipe conductors in the insulation, for current, and the number of conductors to deal with flexing. If the coper being used is of high quality, finely stranded wire will bee a good thing as lkng as the conducter count is adequate. As the copper gets cheaper you will se bigger conductors and the wire will not have as much flexibility.
Summit has decent wire

1964 Monza Convertible
110 4 speed
Peoria, IL

Options: ReplyQuote
Re: OT - AWG vs GA or gauge
Posted by: ensys ()
Date: November 22, 2017 09:05PM

At the risk of being pedantic, I am moved to note two things:

1. In sizing wire, amperage is the operant capacity, not voltage.

2. A "wire" is a single strand, a "cable" is twisted multi-strand.

(bows out quietly)

Keep 'em flying...

S.J.Szabo

From America's
Automobile Heartland

Options: ReplyQuote


Sorry, only registered users may post in this forum.
This forum powered by Phorum.