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Old 05-30-2010, 11:11 PM   #1
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How many wires in Romex v. extension cord?


Sorry Dave, for the complicated Title.
Please settle a dispute between me and DH. How many wires are in a Romex cable? My understanding is that 12/2 = white, black, and ground. 12/3 = white, black, red, and ground. Right?

DH has found some extension cord that he wants to use as speaker wire (don't ask...) it is labeled 14/3. What does that mean? Why aren't they standardized?
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Old 05-30-2010, 11:16 PM   #2
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How many wires in Romex v. extension cord?


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Sorry Dave, for the complicated Title.
Please settle a dispute between me and DH. How many wires are in a Romex cable? My understanding is that 12/2 = white, black, and ground. 12/3 = white, black, red, and ground. Right?

DH has found some extension cord that he wants to use as speaker wire (don't ask...) it is labeled 14/3. What does that mean? Why aren't they standardized?
How many do you want in the Romex? If it is XX/2 =G there are 3. If it is XX/3 + g there are 4. You can also get 2 circuit with 2 neutrals + g so it would have 5. I don't know if they make more but it would be possible.

to your 2 types of NM (Romex is a TM'd name used to be owned by the Rome Wire Co and now owned by South wire (I think)) you count and color would be correct. The ground would be bare

extension cord or SO cord counts the ground within the number so a 12/3 SO cord would have a black, a white and a green insulated conductor

and they are standardized. NM doesn't count the ground and SO cord does. Isn't that standardized?

Last edited by nap; 05-30-2010 at 11:19 PM.
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Old 05-30-2010, 11:18 PM   #3
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How many wires in Romex v. extension cord?


So NM cable 14/3 = four wires inside
extension cord 14/3 = three wires inside?

Doesn't that seem weird to anyone else?
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Old 05-30-2010, 11:24 PM   #4
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How many wires in Romex v. extension cord?


L
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eah Frances;449100]So NM cable 14/3 = four wires inside
yes


Quote:
extension cord 14/3 = three wires inside?
yes

Quote:
Doesn't that seem weird to anyone else?
I guess it's just a trade thing. I'm thinking it goes back to when NM didn't have ground wire in them and then they tossed in the un-insulated wire.

so, rather than calling 12/2 NM 12/3 NM when you put the ground wire in, to avoid confusion, they called it 12/2 WG (with ground).

the ground wire in SO could be used to carry current if need be. The ground in NM cannot as it is not insulated other than the outer sheath.
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Old 05-30-2010, 11:54 PM   #5
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How many wires in Romex v. extension cord?


Thanks, but I still think it's stupid.
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Old 05-31-2010, 12:08 AM   #6
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How many wires in Romex v. extension cord?


Ok. Here's another question. DH wants to "combine" each of the wires in the 14/3 extension cord and wants to know what that equals.
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Old 05-31-2010, 12:11 AM   #7
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How many wires in Romex v. extension cord?


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Ok. Here's another question. DH wants to "combine" each of the wires in the 14/3 extension cord and wants to know what that equals.
Yes, I know this is STUPID.
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Old 05-31-2010, 12:14 AM   #8
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How many wires in Romex v. extension cord?


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Yes, I know this is STUPID.
Not sure what you mean. Are you asking what size of wire he would have if he interconnected all 3 #14 wires together into 1?
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Old 05-31-2010, 12:20 AM   #9
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How many wires in Romex v. extension cord?


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Not sure what you mean. Are you asking what size of wire he would have if he interconnected all 3 #14 wires together into 1?
That is exactly what he wants to do.
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Old 05-31-2010, 12:32 AM   #10
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How many wires in Romex v. extension cord?


well, let's see.

#14 wire is 4110 circular mils so 3 times that would be 12330 circular mils. #10 wire is 10380 circular mils and #8 is 16510 circular mils so that would put him at about a #9 wire.
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Old 05-31-2010, 01:54 AM   #11
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How many wires in Romex v. extension cord?


let me try that in metric verison .,

2.5mm≤ X 3 = 7.5mm≤ so the size will be roughly between #10 and #8 AWG size

and I know you will ask me if I have any wire size close to that size if 8mm≤ the answer is no unless you get into electric motor or transfomer that about it.

Merci,Marc
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Old 05-31-2010, 07:56 AM   #12
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How many wires in Romex v. extension cord?


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That is exactly what he wants to do.
If he twists them together over their whole length he might get somewhat equal current sharing and if he has a DVM and a 100w incand. lamp he can check how equal.

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Old 05-31-2010, 09:38 AM   #13
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How many wires in Romex v. extension cord?


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So NM cable 14/3 = four wires inside
extension cord 14/3 = three wires inside?

Doesn't that seem weird to anyone else?

They're counting the insulated conductors.
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Old 05-31-2010, 03:44 PM   #14
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How many wires in Romex v. extension cord?


He wants to use it as speaker wire. Sheesh.
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Old 05-31-2010, 05:13 PM   #15
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How many wires in Romex v. extension cord?


Sure seems overkill for speaker wire!

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