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Old 04-18-2008, 12:07 PM   #16
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240 circuit kiln


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It has a plug on it already that looks like a dryer plug, 3-prong.
Probably looks more like a range plug.

Run 6-2 and install a range outlet. You will be fine.

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Old 04-18-2008, 12:31 PM   #17
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240 circuit kiln


If it has a range plug on it then that was installed by a homeowner not the manufacturer. That would be the incorrect plug to be using on that kiln. I would bet that this kiln was meant to be hardwired at that amperage. Maybe when the op gets the info I asked for we can give him the exact information he needs.
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Old 04-18-2008, 06:28 PM   #18
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240 circuit kiln


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Originally Posted by Stubbie View Post
Hi John

To my knowledge romex has never been allowed to use the 75C column. See
334.80. The section that is specific to NM cable will override that in 310.15.
Yes, the conductors are rated 90c however they are not handled like thhn or thwn as for ampacity.

The 90 c rating can only be used when NM conductors are derated for bundling or conduit and with NM cables the final derating cannot exceed the 60C column.

The overcurrent can be 60 amps for #6 nm-b but only because the next size up rule is applied since the ampacity is only 55 amps for #6 nm-b column 1 60C conductors.
My mistake Stubbie. I have always used the 75c column for nm. I know about the terminals and not using the 90c column except for derating but wasn't aware of being forced to use the 60c column. I know it now. Thanks.
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Old 04-18-2008, 06:50 PM   #19
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240 circuit kiln


Don't sweat it I knew you were aware of the derating stuff but needed to be said in my reply cause it all sorta "bundles" together...

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