Current carrying capacity of wire by gauge size

[AK]

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?

 

[default]

On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
<scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?

Shielding shouldn't matter a great deal, the shield isn't there to
carry current. In industrial applications the shield is only
connected (to ground) at one end. Computers and peripherals do
connect at both ends.

Ampacity of the wire gauge has as much to do with the application and
environment as anything... That table is a good one. You'd need to
de rate (use a larger gauge) if it were in a hot environment, well
insulated, etc.. It is all about heat due to resistance and voltage
loss due to resistance. Different insulations stand heat better than
others.

Another consideration is how much voltage drop are you willing to put
up with? Wire has resistance and a long run can adversely affect the
voltage available at the load end. As copper heats, resistance goes
up, another consideration...

And if you buy your wire on Ebay see if it is actually copper and not
CCA Copper Covered Aluminum - you wouldn't use a copper wire table for
aluminum wire.

 

[default]

On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
<scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?
https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html

They give a table to select wire size no rocket science involved,
(this is a recommendation for 12V and a <3% drop in voltage)

15 feet use 16 AWG
20-25 feet use 14 AWG

Etc.

 

[AK]

On Thursday, July 11, 2019 at 4:03:56 AM UTC-5, default wrote:

On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?

Shielding shouldn't matter a great deal, the shield isn't there to
carry current. In industrial applications the shield is only
connected (to ground) at one end. Computers and peripherals do
connect at both ends.

Ampacity of the wire gauge has as much to do with the application and
environment as anything... That table is a good one. You'd need to
de rate (use a larger gauge) if it were in a hot environment, well
insulated, etc.. It is all about heat due to resistance and voltage
loss due to resistance. Different insulations stand heat better than
others.

Another consideration is how much voltage drop are you willing to put
up with? Wire has resistance and a long run can adversely affect the
voltage available at the load end. As copper heats, resistance goes
up, another consideration...

And if you buy your wire on Ebay see if it is actually copper and not
CCA Copper Covered Aluminum - you wouldn't use a copper wire table for
aluminum wire.

Thanks for the good info.

Andy

 

[AK]

On Thursday, July 11, 2019 at 7:15:04 AM UTC-5, default wrote:

On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?
https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html

They give a table to select wire size no rocket science involved,
(this is a recommendation for 12V and a <3% drop in voltage)

15 feet use 16 AWG
20-25 feet use 14 AWG

Etc.

I will be using 120 Volt AC.

Current draw may be up to 15 amps.

Andy

 

[Look165]

Voltage is not important, since insulation is good (plastic envelope).
Consider 1mm^^2=10A max (not permanent).
For 15A, I would suggest at least 2mm^^2, 1.5mm^^2 would be a little too
thin !
Mono or multi wire, it is not important ; this only apply at higher
frequency.

AK a Êcrit le 11/07/2019 à 15:50 :

On Thursday, July 11, 2019 at 7:15:04 AM UTC-5, default wrote:
On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?
https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html

They give a table to select wire size no rocket science involved,
(this is a recommendation for 12V and a <3% drop in voltage)

15 feet use 16 AWG
20-25 feet use 14 AWG

Etc.
I will be using 120 Volt AC.

Current draw may be up to 15 amps.

Andy

 

[default]

On Thu, 11 Jul 2019 06:50:57 -0700 (PDT), AK
<scientist77017@gmail.com> wrote:

On Thursday, July 11, 2019 at 7:15:04 AM UTC-5, default wrote:
On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?
https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html

They give a table to select wire size no rocket science involved,
(this is a recommendation for 12V and a <3% drop in voltage)

15 feet use 16 AWG
20-25 feet use 14 AWG

Etc.

I will be using 120 Volt AC.

Current draw may be up to 15 amps.

Andy

That's easy enough then... you need a minimum of 14 AWG if the
circuit breaker says 15 and 12 if it is 20. If it is going between
wall spaces (concealed wiring) then there is a local electrical code
that comes into play for the type of insulation and whether it needs
to be armored cable, run in conduit, etc..

 

[Look165]

Shield is only there for shielding.
It has no participation in the current distributed.

default a Êcrit le 11/07/2019 à 20:32 :

On Thu, 11 Jul 2019 06:50:57 -0700 (PDT), AK
scientist77017@gmail.com> wrote:

On Thursday, July 11, 2019 at 7:15:04 AM UTC-5, default wrote:
On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?
https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html

They give a table to select wire size no rocket science involved,
(this is a recommendation for 12V and a <3% drop in voltage)

15 feet use 16 AWG
20-25 feet use 14 AWG

Etc.
I will be using 120 Volt AC.

Current draw may be up to 15 amps.

Andy
That's easy enough then... you need a minimum of 14 AWG if the
circuit breaker says 15 and 12 if it is 20. If it is going between
wall spaces (concealed wiring) then there is a local electrical code
that comes into play for the type of insulation and whether it needs
to be armored cable, run in conduit, etc..

 

[Ralph Mowery]

In article <c8f3ea47-476c-418e-ab31-bff61565dea7@googlegroups.com>,
scientist77017@gmail.com says...

I will be using 120 Volt AC.

Current draw may be up to 15 amps.

Andy

As others are going to say, use # 14 wire minimum. Remember that you
are really dealing with 50 feet instead of 25 feet if your load is 25
feet from the source.

 

[amdx]

On 7/10/2019 9:55 PM, AK wrote:

Having a hard time finding something that isn't rocket science.

I thought that since it takes shielded wires to get the current necessary to run electronic items, it would loosely be related.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

Any recommendations?

There are different criteria that need to be considered.
In no particular order.
1)
How much voltage drop can your circuit handle without malfunction.
Using numbers from the link you posted, Let's assume you have a #22
wire, it has 52 ohms per 1000ft, or 5.2 ohms per 100 ft.
If you have a circuit that requires 12 volts and draws 1 amp, and you
have a 50 ft run (50ft each way equals 100 ft total) of #22 wire.
To find the voltage drop caused by the wire you multiply. 1 amp x 5.2
ohms equals a voltage drop of 5.2 volts. That means you would need a
supply of 12volts + 5.2 volts = 17.2 volt supply to make sure you have
12v at your circuit.
And then someone recommended #14 wire for 15 amps, that is in the
electrical code, you must limit current to 15 amps with a fuse or
circuit breaker for a #14 wire. Code says if you use #12 wire you must
limit current to 20 amps.
Please make me explain any of that again if you don't understand.

2) Heat build up in the wire from the current flow. If you have too much
current flowing in the wire it will get HOT. How much heat can the
insulation handle before melting or before starting a fire.

3) Fusing of the wire, at some high current the wire will actually melt
like a fuse.

To operate, a circuit must be complete, meaning start at the power
supply, a wire to the circuit, through the circuit, a wire back to the
power supply. So two wires.
A shield is something different, but the shield can be one of the
wires just discussed. Look up coax. Or it may be a separate wire that
is usually grounded. Look up shielded pair.

Can you rephrase your question with any new information you have
learned. Maybe with volts, amps, or?
Mikek

 

[whit3rd]

On Thursday, July 11, 2019 at 6:51:00 AM UTC-7, AK wrote:

On Thursday, July 11, 2019 at 7:15:04 AM UTC-5, default wrote:
On Wed, 10 Jul 2019 19:55:09 -0700 (PDT), AK
scientist77017@gmail.com> wrote:

Having a hard time finding something that isn't rocket science.

I want to know the current carrying capacity of shielded wire by the wire gauge for runs of less than 25 feet.

I found this.

https://www.engineeringtoolbox.com/wire-gauges-d_419.html

I will be using 120 Volt AC.

Current draw may be up to 15 amps.

If the wires are short, and inside a box, the fire-safety and power-delivery considerations for
household wiring in flammable walls are not relevant.

120V, 15A, and any of the (standard grades) of household wiring insulation work for
home construction, but could fail in a different situation. If the current is pulsed,
and inside an appliance, the gage can be smaller (and insulation with ceramics can
let an incandescent wire be acceptable). It's not uncommon to see a nichrome
heater that takes 15A through a wire less than a millimeter in diameter, for instance.