[Amps] Filament Xfmr

[TexasRF at aol.com]

Opps! make that .4 watts.
 
73/k5gw
 
 
 
In a message dated 7/8/2012 6:37:04 P.M. Central Daylight Time,  
TexasRF at aol.com writes:

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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