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Old 10-01-2007, 09:39 PM   #1
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Default Measuring wire gauge

What tool(s) do you guys use to measure wire gauge size when it is not printed on the conductor's jacket or the jacket is not visible?

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Old 10-02-2007, 07:16 PM   #2
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Here are some previous replies:

240V Circuits

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Old 10-02-2007, 07:43 PM   #3
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They make a little set of plastic gauges that you can slip in if there's some exposed conductor to get them around. I got a set years ago, but they're not as helpful as you might think. The lugs smash the conductor into a bit of an oval. Here's one such gauge http://www.professionalequipment.com...s=wire%20gauge The actual old-school Brown and Sharpe wire gauges are metal.
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Old 10-02-2007, 08:17 PM   #4
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Thanks Marc,

What I'm looking for is something bigger for #4awg and larger. Needed something on the last quote where feeders were suppling sub-panels from a meter base/disco panel and the outer jackets were not visible. Needed to know the wire gauge so I could calculate the feeders size to each unit. So, I took my tape measure and just measured the diameter and went to home depot around the corner and came up with #2 conductors. Guess, that is not the best way to determine wire size.
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Old 10-02-2007, 08:27 PM   #5
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I see plastic calipers at these traveling tent tool sales places a lot for all of two or three dollars. I think you could measure the conductor with one of those plastic calipers, and match it up with the chart of conductor diameters.
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Old 10-02-2007, 09:05 PM   #6
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General and others make a plastic dial calipers. I agree that would be your best bet at an accurate sizing. Then just use the Conductor Properties in Table 8 of Chapter 9 of the NEC.
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Old 10-02-2007, 10:08 PM   #7
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Thanks Marc & Petey,

That is what I will do.

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