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Posted by EXT on August 1, 2007, 7:51 pm
I have noticed that insulation is now thinner than on wires made 20 or 40
years ago.
> wrote:
>
>>> Since it is too hot to play outside I was stripping some wire in recycle
>>> box. It looked like some of the old 12 gauge was bigger than the new
>>> stuff. So I stripped exactly 1 foot of 12/2 wg 20 years old and 2-3
>>> years
>>> old and weighed it on my postal scale. They sure as heck did not look
>>> the
>>> same or weight the same.
>>>
>>> As the insulation has gotten better and more heat resistant has the wire
>>> been down-sized?
>>
>>Postal scale? Probably not accurate enough for this measurement. Anyway,
>
> Accuracy is not really a concern when comparing two weights on the
> same scale.
>
> Precision is what matters. One should either weigh the same thing
> several times to see if the reading is always the same, or average the
> readings if they are different**. Same thing with the other item.
>
> **If the readings are different from one time to the next, one should
> tap the scale with the weight on it, to see if the reading changes.
> If it does, it may be possible to lubricate the scale. That may
> eliminate the problem. If the problem exists or persists, it's better
> to tap the scale every time to see where the reading comes to rest.
>
>
> All that said, my postal scales have been quite consistent in its
> readings. They are adjustable to get better accuracy, but like I say,
> accuracy is not important when comparing two weights on the same
> scale.
>
>
>
>>if you stripped it the insulation doesn't matter in this calculation.
>>
>>1 foot of 12GA copper wire should weigh .316 oz. What did your samples
>>weigh?
>>
>>AWG Copper Wire Table
>>AWG Diam. (mils) Circular mils Ohms/1000ft Feet per Pound
>> 12 80.8 6529 1.619
>>50.59
>>
>>
>
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