Re: Testing wire insulation?


"Dave Curtis" <dbaudiotech@xxxxxxxxxxxxxx> wrote in message news:j488f55kbg3ob5lrt33uk7qv8n5mr6kbq8@xxxxxxxxxx
On Thu, 5 Nov 2009 08:18:26 -0500, "Phil_S"
<psymondsnospam@xxxxxxxxxxx> wrote:


"Dave Curtis" <dbaudiotech@xxxxxxxxxxxxxx> wrote in message
news:npi5f555fngip5pcbjgf3tsdd2moa385ps@xxxxxxxxxx
On Tue, 3 Nov 2009 14:11:47 -0500, "Phil_S"
<psymondsnospam@xxxxxxxxxxx> wrote:

I must not have enough to do, thinking up crap like this....

Typical 600V wire is rated at 105 degrees C. Do I understand that 105C is
the temperature beyond which one should not push this wire and that the
temperature rating is somehow related to the voltage rating?

That's the max ambient temp. Higher than that, you need to derate.
Temperature and voltage rating of wire are 2 different animals. IOW,
you can find 1000V wire rated @ 90C, or 300V wire rated @ 105C.

Here's the madness....if I put unmarked wire in the oven for a while
(15-20min) and it doesn't melt at 250F (121C), is that a reliable test?
125C would be 1000V rated.

Reliable for temperature rating, I guess.

Insulation is generally tested with a Megohmeter ("Megger"). Maybe
you know an electrician in your area that has one. Or just go ahead
and use the stuff.

-DC

Hi Dave,
Thanks for the clarification. I'm inclined to use it. I gave a hard look
under intense light at the grey outer jacket for the bundle and finally saw
that it is rated for 300V. Given it's industrial application, I'm thinking
that is a minimum rating.

No, it's a max. The minimum rating would be 0V. ;o)

As they say up your way, "ayup!"


I don't think I'd put it in an SVT, but I'm
thinking it will do fine if voltage happens to get into the low to mid
300's.

I concur.

Anyway, I've got other stuff that I can use where the voltage is too
high. You know how I am...just squeezing the buffalo on the nickel to see
if it shits.

That got a chuckle out of me.

How many are old enough to remember the buffalo was on the nickel...actually, to be factually correct, it's a bison.

We tend to be quite frugal around here,
so I can relate. I still have bunches of #18 solid 1000V pieces if
you want, but you'd have to spring for postage...


Thanks, but I've got several yards of that in any color you want as long as it's blue or red. It came in a boxload I got on eBay of 600V blue/white or white.

:o)


;o) to you, too.

.

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