In article OPpti.3043$dD3.1679@trnddc07, "Tony" wrote:
Doug: no disrespect to you are any one ales in this forum,
I have no degree to speak of so I am not going to contradict you
But from my understanding insulation do not have anything
to do with wire Ampacity or in the other words capacity to
carry amount of current.

Well, I'm sorry, but your understanding is incorrect. Ampacity depends on
multiple factors, and insulation is one of them. I'll try to explain.

Wire insulation rating is for soly purpose
where that wire can be used to be able to carry it's rated current.

Exactly. And the rating depends on the type of insulation (among other
things) -- this is laid out clearly in Table 310.16 of the National Electrical
Code.

example # 10 wire insulated with rubber is good up to maximum
140 Deg. F regardless if is carrying 30 amps. or 10 amps.
because at that temp. rubber will start to melt.

Which is exactly why wires with rubber insulation are limited to carrying
currents low enough to *not* heat the wire up that much. Wires insulated with
materials capable of withstanding higher temperatures are allowed to carry
more current because they can get hotter without damaging the insulation and
creating a hazard.

I use lot of glass cover wire and Teflon but # 10 wire is good
only for up 30 amps. higher amperage requires larger conductor
8 or 6 whatever I may need so I don't see insulation been factor here

The insulation *isn't* a factor for AWG10 and smaller wires, because the NEC
specifically limits the allowable breaker rating for AWG10, 12, and 14
conductors to 30A, 20A, and 15A respectively, regardless of what insulating
material is used.

For wires AWG8 and larger, the ampacity *does* depend on the insulation. For
example, AWG8 wires with Type TW insulation are limited to 40A -- but with
Type THHN insulation, the allowable ampacity is 55A.

I am sorry that is the way I see it
Tony
www.cas-environ.com



"Doug Miller" wrote in message
.net...
In article pFkti.3844$J13.1918@trnddc02, "Tony"
wrote:

And for any General use #6 wire three in conduit is rated for 65 Amps.

That is incorrect -- the ampacity depends on the insulation. Type TW or UF
6AWG conductors, for example, have an ampacity of 55A.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.