[Prev][Next][Index][Thread]
REVISED AWG Wire Table for Coilers
----------
From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Tuesday, April 14, 1998 4:42 PM
To: Tesla List
Subject: Re: REVISED AWG Wire Table for Coilers
Hi Tom, all,
> From: Thomas McGahee [SMTP:tom_mcgahee-at-sigmais-dot-com]
> Sent: Thursday, April 09, 1998 7:59 PM
> To: Tesla-2; tesla-at-pupman-dot-com
> Subject: REVISED AWG Wire Table for Coilers
>
> Fellow Coilers,
> A few people e-mailed me to say that I was a bit conservative on the amp
> ratings
> for the AWG wire table I e-mailed to the TESLA and TESLA-2 lists.
>
> I realize that we Coilers love to push things to the limit. In going back over
> my AWG sources I did find one source that went as high as 23.679 amps for
> AWG #10. Someone mentioned that UL codes allowed 23 amps for AWG #12. Such a
> large value must be assuming the wire is enclosed in a metal conduit which
> is acting as a heat sink. I have re-written my program to reflect a Max
> recommended continuous current of 23.679 amps for a #10 AWG bare copper wire
> cooled by ambient air.
>
> I am sorry if sending this second revised AWG table means a few more seconds
> of download time for the List members. Dump the earlier table and file this
> revised table away for future reference.
>
> Hope this helps.
> Fr. Tom McGahee
As the length of the conductor is reduced and cooling is increased,
you can push current densities to a pretty high value. What would
overheat and fail in a 50Hz transformer winding at a certain power
level would be total overkill in a switchmode transformer as the I^2.R
loss is drastically reduced due to the short length of wire used.
Check out the conductor (tinned copper) thickness in a glass 10 Amp
fuse. Thanks for the table and thanks to Antonio for the equation.
Malcolm