Electronics > Projects, Designs, and Technical Stuff

Mains cable size

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Mr. Scram:

--- Quote from: TimFox on August 05, 2020, 10:18:28 pm ---I have only heard it quoted as "R", never the other colors.
Europeans think that Americans only measure distances in "football fields".

--- End quote ---
Why would yanks measure in soccer pitches?  :-//

calzap:
There's an insane mix of gauges for wire, needles and drill bits in the U.S.  SWG (standard wire gauge aka British standard wire gauge) isn't used much ... guitar strings is about it.  SWG is not the same as AWG (American wire gauge aka B & S [Browne and Sharpe] gauge), used for electrical wiring.  Then there's BWG (Birmingham wire gauge aka Stubs iron wire gauge) used for hypodermic needles and iron (not steel!) wire.  There's the crazy number/letter drill gauges.  And the W&M (Washburn and Moen) gauge used for steel wire, which is not to be confused with Stubs steel wire gauge.  Finally, there is U.S. standard gauge for sheet metal, which is not to be confused with American wire gauge.

Help!

Mike in California



Pawelr98:
I prefer the cross section in mm2 because it allows direct calculation (or looking up the table) of resistance regardless of the shape.

In shops very often wiring is only marked as 3x2.5, assuming mm2 as the unit.

Only some people use AWG because they deal with US documents.
My friend who is a an proffesional RC model racer uses AWG all the time because a lot of documents and guides use AWG.

TimFox:
The number/letter drill gauges are not crazy.  The exponential steps allow one to get within a given fraction of a desired size, just like the standard resistor values.  You need a table anyway to specify the tap drill size, even for “non-crazy” screw sizes like M3 or 1/4-20 UNC.

langwadt:

--- Quote from: TimFox on August 06, 2020, 01:11:13 am ---The number/letter drill gauges are not crazy.  The exponential steps allow one to get within a given fraction of a desired size, just like the standard resistor values.  You need a table anyway to specify the tap drill size, even for “non-crazy” screw sizes like M3 or 1/4-20 UNC.

--- End quote ---

M3 is 0.5mm pitch so the drill size is is 3.0-0.5 = 2.5mm ...

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