THHN VS XHHW

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My guess is it is the popularity of one product over another. Maybe THHN is considered more

versital than XHHW ? Itruthfully do not know, just a guess. Look at the cost of a 15A recptacle

(three prong) vs a 2 prong ungrounded one. They make a heckuva lot more 3 prong than

2 prong.
 
John120/240 said:
My guess is it is the popularity of one product over another. Maybe THHN is considered more

versital than XHHW ? Itruthfully do not know, just a guess. Look at the cost of a 15A recptacle

(three prong) vs a 2 prong ungrounded one. They make a heckuva lot more 3 prong than

2 prong.
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I think the question is why the %age difference is less for a larger size wire
 
My guess would be that the bulk of the cost is the copper, bigger wire more copper. The amount of copper is the same regardless of the insulation type. I would expect the cost difference in percentage to go down as the wire size increases.
 
eric9822 said:
My guess would be that the bulk of the cost is the copper, bigger wire more copper. The amount of copper is the same regardless of the insulation type. I would expect the cost difference in percentage to go down as the wire size increases.
Click to expand...

I think you've hit the nail on the head.

For #12, you probably have more insulation than copper in the wire.

For 500 KCM, there might be 10 times as much copper as insulation.
 
weressl said:
The cost of the raw material and the volume sold determines the price. So it would appear that people who specify XHHW do not use 3/0, but choose the next higher size. For years I've heard that 3/0 is NOT a readily available size in XHHW.
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That's standard 200A wire size, so I highly doubt that.
 
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