[Amps] Filament Xfmr

[TexasRF at aol.com]

Hi All, a web wire chart shows #18 to have .004 ohms per foot. Two 5"  
leads are close enough to a foot so a quick calculation of heating is 10A X 10A  
X .004 =  4 watts of heating.
 
Seems if there is any air flow at all the wire should be ok.
 
73,
Gerald K5GW
 
 
 
In a message dated 7/8/2012 12:01:03 P.M. Central Daylight Time,  
n4kwpete at 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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