Author Topic: Mains cable size  (Read 5713 times)

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Offline Mr. Scram

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Re: Mains cable size
« Reply #25 on: August 05, 2020, 10:28:40 pm »
I have only heard it quoted as "R", never the other colors.
Europeans think that Americans only measure distances in "football fields".
Why would yanks measure in soccer pitches?  :-//
 

Offline calzap

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Re: Mains cable size
« Reply #26 on: August 06, 2020, 12:20:40 am »
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



 

Offline Pawelr98

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Re: Mains cable size
« Reply #27 on: August 06, 2020, 12:37:07 am »
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.
 

Offline TimFox

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Re: Mains cable size
« Reply #28 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.
 

Online langwadt

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Re: Mains cable size
« Reply #29 on: August 06, 2020, 01:28:36 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.

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

Offline TimFox

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Re: Mains cable size
« Reply #30 on: August 06, 2020, 01:52:12 am »
I would have to look up the pitch on a screw labeled M3.  There are also entries in a good tap drill table for “cutting taps” and “forming taps”.  For example,  https://www.gfii.com/images/Greenfield_Tap_Drill_Recommendations.pdf
« Last Edit: August 06, 2020, 02:00:41 am by TimFox »
 

Offline Clear as mud

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Re: Mains cable size
« Reply #31 on: August 06, 2020, 02:06:14 am »
a stone is 14 lbs
Oh, I always thought a stone was 20 lbs.  I guess whenever I saw a British person give their weight in stones, I thought they were quite a bit heavier than they really were!
 


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