How many ohm's is a 12 gauge 50' cord?

How many ohm's is a 14 gauge 50' cord?

How many ohm's is a 12 gauge 100' cord?

How many ohm's is a 12 gauge 100' cord?

1 - 16 of 16 Posts

How many ohm's is a 12 gauge 50' cord?

How many ohm's is a 14 gauge 50' cord?

How many ohm's is a 12 gauge 100' cord?

How many ohm's is a 12 gauge 100' cord?

http://www.powerstream.com/Wire_Size.htm

14 ga = 2.5 ohms per 1000' and 12 ga was 1.6 ohms for the same 1000'

Very small numbers if trying to measure 50 or 100 feet of wire. That would require a really good meter and still not really accurate.

lets see what the electrical pros suggest.

Bud

Joined

·
9,277 Posts

http://www.interfacebus.com/AWG-table-of-different-wire-gauge-resistance.html

I’d look again for the printed info on the jacket. Note that it is often just stamped into the jacket (no ink).

Why do you believe that they are 12 or 14 awg ? The most likely gauge for a typical homeowner outdoor extension cord would be 16 awg.

The ultimate method for finding the wire gauge is to cut one of the cord caps off off and measure the wire diameter. Then install a new cord cap.

Not worth it to figure out cord gauge. A fun experiment to see if you can come up with a test apparatus that would even give you a useful result, though.

Joined

·
4,080 Posts

http://www.wetechnologies.com/technical-info/Stranded%20Wire%20Chart.pdf

Bud

Bud

Joined

·
4,080 Posts

But as already stated here, these calculations would have to be done in a test lab setting, with all the test parameters set up in a controlled environment to get a sound and proven result.

And all while using various ampere loads on the cord, while in various ambient temperature settings. I see now, this topic is WAY over my pay grade here....

Bud

Acceptable for an amateur or even a professional electrician for typical wiring jobs and troubleshooting but not for trying to figure out the gauge of wire in a cable.

In high school science classes I learned about "uncertainty." For example a typical voltage measurement might be 12 volts plus or minuts a quarter volt. Delving into details, when adding or subtracting two quantities the uncertainty of the result is the sum of the absolute values of the uncertainties for example if we subtract 5 volts +-1/8 volts from 12 volts +-1/4 volt we get 7 volts +-3/8 volts.

Getting out of the world of minutiae back to basics, even you willl agree that 117.3 volts plus or minus 2.1 volts sounds like a joke.

Joined

·
4,080 Posts

Bud

Just for reference and I doubt if todays extension cords vary by much. As most all of them are MIC and they put the least jacket thickness on them allowed I bet.

I just measured the outside diameter of three of my factory extension cords. All of my cords still have the manufacturers stamp on the cord showing what size conductors it has in them ( 3 wires each in them)

16 gauge conductor cord measures .300 in. O.D.

14 gauge " ......................... .355 in. O.D.

12 gauge " " ' .566 in. O.D.

Use a DC voltage source at one side, and use the returned DC voltage to power a DC resistive load. This can be a lightbulb or whatever. Use something that is within the margins of your ampacity, so lets say 10-15A. couple of 55w DC bulbs, 110W/12V 9.16A. You would need to record the applied voltage while under load, the returned voltage, and the current. With that information, you can determine the resistance in the wire, which will give you the info you seek.

DC volts is the most accurate value for meters to read but regardless, it is relative, just use the same meter for all tests.

1 - 16 of 16 Posts

Join the discussion

DIY Home Improvement Forum

A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Helping You to Do It Yourself!

Full Forum Listing
Explore Our Forums

Recommended Communities

Join now to ask and comment!