Too many rely on the NEC table which hasnt been in touch with reality for
decades unless you build your amps with house wiring (-; Thats the last place
Id look.
Carl
KM1H
----- Original Message -----
From: Gudguyham@aol.com
To: km1h@jeremy.mv.com ; n4kwpete@centurylink.net ; amps@contesting.com
Sent: Sunday, July 08, 2012 2:15 PM
Subject: Re: [Amps] Filament Xfmr
You will notice at looking at the NEC ampacity table it is categorized by the
type of insulation on the wire. They generally do not cover the types of wire
found within devices, only those used in electrical construction. Simply
saying #14 wire handles 15A is rather vague unless we know exactly the type of
wire and the insulation on it. Although the insulation changes the ampacity a
bit, it is not worlds away. You would be surprised if you looked at the
ampacity of wire in free air however.
In a message dated 7/8/2012 1:50:49 P.M. Eastern Daylight Time,
km1h@jeremy.mv.com writes:
There are plenty of non Teflon insulations that go from 105C to higher.
Modern vehicles have gone to 175-200C wiring in some areas as a means of
reducing copper weight..
Carl
KM1H
----- Original Message -----
From: <Gudguyham@aol.com>
To: <n4kwpete@centurylink.net>; <amps@contesting.com>
Sent: Sunday, July 08, 2012 1:17 PM
Subject: Re: [Amps] Filament Xfmr
> If the wire is Teflon it will probably be fine. Can you tell if it is?
>
>
> In a message dated 7/8/2012 1:01:03 P.M. Eastern Daylight Time,
> n4kwpete@centurylink.net writes:
>
> I ordered a filament transformer for a 4CX1500B linear that I am
> building.
>
> When I received the transformer all looked great to me except for the
> secondary pigtail wires. The tube requires 6vac at 10amps, the pigtails
> provided are about five inches long and are a #18 well insulated wire.
> Being concerned with the wire size it put the transformer under load and
> drawing 10amps left it that way for about an hour. The wire did not
> over
> heat in that time but hey how about hours of operating. Should I be
> concerned with the wire size. I have looked for information on how to
> figure how much current various wire sizes can carry and at various
> voltages
> and have not found anything.
>
> 73 Pete N4KW
>
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