Morning Carlos,
I am a little confused:
Understandable.
You will be more than confused, forever, if you continue to use
gauge as a unit of measure.
It is not an acceptable unit to use for measure, unless you specify
which gauge unit you are using.
There are several definitions, all which are different when specific
numbers and usage is applied.
As you observed, AWG ( American Wire Gauge ) is different from
Sheet Metal gauge.
You may see "Imperial Gauge" also.
While these differences are slight, everyone must learn to work with
each specific field.
The best thing to do, as most of us have found, is to purchase a good
caliper or micrometer and measure for yourself.
Years back, I used to purchase a wire we called 18/2 . Everyone
accepted the fact this was 18 ga copper and we used it properly. (
in most cases )
One day I picked up a roll of this 18/2 at the supply house. When I
got to the jobsite, the very first time I stripped insulation off
this wire, .......... I said, this is not 18 ga wire. When I
confronted the supply house, they said, "Yes, they changed
it". Till this day it is marketed and called 18/2 when it is closer to AWG 20.
I could tell by feel and by looks. Most of us that use specific
material regularly can do that.
I have purchased # 12 wire that was undersized. These are examples
of how manufacturers beat consumers our of quality and money. Most
of the public is not even suspicious and cannot imagine or believe
this happens. I noticed it by feel and when measured, it was a few
thousandths too small.
You may want to search and study the "International System of
Units". You will be surprised what you find out about "gauge".
Often we find a stranded wire of many strands which are very fine and
small diameter.
Stranded wire offers advantages when needed.
Some very old textile mills have so much vibration that no solid wire
is allowed in the building.
We can measure individual strands, calculate the cross sectional
area, then circular mills, add all this up, and use this information
to arrive at load capacities, voltage drop, and resistance per 1000 feet.
This is no longer a world for guessing. It is easy to save $
1000 or several thousand, on a large wire order by using the proper
size instead of a size that is larger and not needed.
There is a story about a hacker breaking into a computer and
changing a formula for steel.
This made the steel brittle and could have created many
disasters. Fortunately, an engineer spotted the error before any
steel was manufactured using the hacked formula.
Animal feed and likely human feed is formulated and mixed by computer
controlled systems.
An error here can be disastrous. Hackers know this. Often I think
the best hackers are in fact terrorists.
Once I had a feed mill customer. If the computers failed or
something went wrong at night or week ends, the plant stopped
immediately and specific people must be called to do manual work and
correct the formulation before the plant could continue running.
Once a totally computer controlled plant failed on a Sat
morning. This was a holiday week end.
A friend of mine was out of state and would not be back unit
Monday. Sure enough, the plant ceased to run, no production, until
Monday morning.
Most people cannot imagine the complexity in our daily lives.
Again, there is no room for guessing. Get the facts and understand
them, no matter what it takes.
This is why I was a bit upset about the manufacturer that published
the wrong numbers on the
"grain definition".
Wayne
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