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REVISED AWG Wire Table for Coilers
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From: David Dean [SMTP:deano-at-corridor-dot-net]
Sent: Sunday, April 12, 1998 12:23 PM
To: Tesla List
Subject: Re: REVISED AWG Wire Table for Coilers
>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.
>
So what is conservative?
In my "bible" The Handbook Of Applied Mathematics
fourth edition copyright 1966 D. Van Nostrand Co. Inc
there is a table for bare and enamel covered wire close wound as in a choke
or
transformer which gives 1500 C.M./amp. As an alternate they suggest 1000
C.M.
/amp. From my own research (dissecting transformers and measuring the wire)
I made a note on this table "real life X2" which gives 500 C. M./amp.
In the NEC handbook (NFPA 70 1996 edition) there are many maximum ampacity
tables but the one the electricians in the field actually use works out to
333 C.M./amp.
I followed a link provided by a member of this list
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From: Dan Murphy [SMTP:danmurphy-at-1stnetusa-dot-com]
Sent: Friday, April 03, 1998 3:28 AM
To: Tesla-at-pupman-dot-com; tesla-2-at-emachine-dot-com
Subject: WIRE SOURCE WEBSITE
Hello, all -
If you are looking for ANY kind of wire, try this web site:
http://home.sprynet-dot-com/sprynet/wiretronic
He takes credit cards, has a toll free number, and offers a free wire info
software program. Let us know how you fare!
and got the free wire info software. If you look at the maximum safe current
listed in this program, which is for magnet wire, you get more like 220
C.M./amp.
I use 500 C.M./amp when winding a transformer as it seems to give an
adequate
safyt margin and winding a transformer is quite a lot of work, done by hand.
Best to get it right the first time.
At any rate, I am quite pleased and thankfull for your posting of the
original table
as I have printed it out in large enough font to be able to read, and it is
in the ballpark
for my needs.
Thanks again,
deano
P.S. The wire info software from Wire Tronic is in the form of a 430kb self
executing so it does not take long to recieve and you dont need winzip or
something like that. Also the insulation information is quite handy!