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Discussion Starter · #1 ·
my father got some 12-2 house wire from Home Depot, checked the wire and it is actually 14-2 according to the wire striper and the coating is yellow instead of white, he asked the attendent and that is all they sell. we have done a lot of wiring, is there a new standard for the wire now, they all sell the smaller wire.
 

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All the 12-2 I have bought has a Yellow jacket. The 14-2 has a white jacket... Or did this used to be reversed over 5 years ago? You're just letting us know that according to your calibrated wire strippers you believe the core to be 14ga instead of said 12ga?
 

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Discussion Starter · #6 ·
is it 12-2 or 14-2

It has been a while sence I bought some, and I just checked, my 12-2 house wire is white jacket, and yes the wire striper set to 12 will not strip the new wire, it will on 14, and the wire we bought says 12-2 so it should not pull straight through when set on 12, So did the wire change over the last 5 years? just want to know because the gauge on the wire striper calls it 14-2 not 12-2 and there is a big difference when wiring and using 20amp breakers or higher. thanx for your help in this. I would just like to find out what is going on.
 

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Discussion Starter · #10 ·
Try a different stripper, or even measure its diameter. #12 has a diameter of 0.081", or just a little over 2 mm.
Wire
GaugeInchesMillimeters
0​
0.3065​
7.7851​
1​
0.283​
7.1882​
2​
0.2625​
6.6675​
3​
0.2437​
6.19​
4​
0.2253​
5.7226​
5​
0.207​
5.2578​
6​
0.192​
4.8768​
7​
0.177​
4.4958​
8​
0.162​
4.1148​
9​
0.1483​
3.7668​
10​
0.135​
3.429​
11​
0.1205​
3.0607​
12​
0.1055​
2.6797​
13​
0.0915​
2.3241​
14​
0.08​
2.032​
15​
0.072​
1.8288​
16​
0.0625​
1.5875​
17​
0.054​
1.3716​
18​
0.0475​
1.2065​
19​
0.041​
1.0414​
20​
0.0348​
0.8839​
21​
0.0317​
0.8052​
22​
0.0286​
0.7264​
23​
0.0258​
0.6553​
24​
0.023​
0.5842​
25​
0.0204​
0.5182​
26​
0.0181​
0.4597​
27​
0.0173​
0.4394​
28​
0.0162​
0.4115​
29​
0.015​
0.381​
30​
0.014​
0.3556​
31​
0.0132​
0.3353​
32​
0.0128​
0.3251​
33​
0.0118​
0.2997​
34​
0.0104​
0.2642​
35​
0.0095​
0.2413​
36​
0.009​
0.2286​
37​
0.0085​
0.2159​
38​
0.008​
0.2032​
39​
0.0075​
0.1905​
40​
0.007​
0.1778​
 

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I don't know where that table comes from, but the number listed for #12 is off, I haven't checked the rest. The table from the NEC lists #12 as 0.081". My vernier calipers measure a piece of #12 as 0.0795", which is pretty close.
 

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It has been a while sence I bought some, and I just checked, my 12-2 house wire is white jacket, and yes the wire striper set to 12 will not strip the new wire, it will on 14, and the wire we bought says 12-2 so it should not pull straight through when set on 12, So did the wire change over the last 5 years? just want to know because the gauge on the wire striper calls it 14-2 not 12-2 and there is a big difference when wiring and using 20amp breakers or higher. thanx for your help in this. I would just like to find out what is going on.
It's probably just a change in covering. The copper is easily guaged for accuracy.
There's a simple test to determine 12 from 14 guage, you just bend it. There's a distinct difference in stiffness between the two.
Ron
 

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Try a different stripper, or even measure its diameter. #12 has a diameter of 0.081", or just a little over 2 mm.
So 10 turns wrapped around a pencil should measure 0.81" (26/32") in length. Or, if you prefer, about 100 micro-furlongs.

If you buy in qty's as large as HD does you can tell anyone to label anything any way you want it.

I have seen a wiring diagram for a [vehicle of Asian origin] that had labelled wires as being of larger gauge than they were.
 
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