Why 112kVa?

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jaggedben said:
I'm guessing it's similar to the reason that 1.125 inches is a standard mark on a tape measure.
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AFAIK, the special markings on carpenters' tape measures are related to angle computations for framing and roofing. They correspond to the length of the hypotenuse of a right triangle for some common rise/run combination.
 
There is probably a reason for the standard sizes of just about anything. Sometimes the reason is obscured by time. Why is NM typically sold at big box by the 100 ft? Why not 80 ft? Or 125 ft.

I bought some special wire one time and they told me I had to buy x number of pounds of it. No idea why wire would be sold by the pound.
 
petersonra said:
There is probably a reason for the standard sizes of just about anything. Sometimes the reason is obscured by time. Why is NM typically sold at big box by the 100 ft? Why not 80 ft? Or 125 ft.

I bought some special wire one time and they told me I had to buy x number of pounds of it. No idea why wire would be sold by the pound.
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Magnet wire for building motors and transformers is usually sold by the pound.

I guess 50lb of copper wire of whatever gauge takes up pretty much the same space, no matter the gauge over a pretty wide range. And motor magnet wire comes in far more different sizes than building wire. It is commonly available by the half gauge, sometimes by the quarter gauge. When you are trying to optimize slot fill you might need something strange like 17.5ga wire.

-Jon
 
GoldDigger said:
AFAIK, the special markings on carpenters' tape measures are related to angle computations for framing and roofing. They correspond to the length of the hypotenuse of a right triangle for some common rise/run combination.
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I was talking about standard markings, not special ones. Like 1.375 and 1.625.
 
winnie said:
Magnet wire for building motors and transformers is usually sold by the pound.

I guess 50lb of copper wire of whatever gauge takes up pretty much the same space, no matter the gauge over a pretty wide range. And motor magnet wire comes in far more different sizes than building wire. It is commonly available by the half gauge, sometimes by the quarter gauge. When you are trying to optimize slot fill you might need something strange like 17.5ga wire.

-Jon
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We use it metric sized even if it is 112 kVA
 
Besoeker3 said:
I don't see that. I have several steel tapes - they are inch and metric. None are 1.125 inch.
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It won't be identified as 1.125 but you would seldom find one that doesn't have some mark at the 1.125 inch distance. Standard is usually identifying every whole inch and just a mark at any lesser divisions.
 
Wayne got it in post 6.

Build a three phase bank with three of the 37.5 kVA. What you got?
 
kwired said:
It won't be identified as 1.125 but you would seldom find one that doesn't have some mark at the 1.125 inch distance. Standard is usually identifying every whole inch and just a mark at any lesser divisions.
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The tapes I have are 16ft and 5m. That's it.
 
Mr. Serious said:
They could round it off to 35 and it's still closer to the geometric mean than 37.5 is. Circuit recloser sizes (amps) for power distribution: 15, 25, 35, 50, 70, 100, 140. It's more of a geometric sequence.

But it's really not much difference between 35 and 37.5.
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As in "who cares?" :D
 
For all youins that say standard tape measures don't have marks at 1/8" (.125)...... what kind of drugs do you do for breakfast?

And now back to your regularly scheduled non-derailed thread...wait....it appears to be a 44-ton derailment this time.
 
Well, all rulers have A mark a 1-1/8, but not a special mark like the ones every 19.2" for one less stud per 8'.
 
My tape measure (Yo Yo) doesn't have any markings at 1.125 inches. or 1 inch. It might
 
Besoeker3 said:
The tapes I have are 16ft and 5m. That's it.
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The typical tape measure used by construction and many other trades that are layed out in inches format, typically have a mark every 1/16 of an inch. Because of this there will be a mark at 1.125". That mark won't be identified by a name/number but the 1.00 inch mark will as well as all the other whole inch marks.
 
kwired said:
The typical tape measure used by construction and many other trades that are layed out in inches format, typically have a mark every 1/16 of an inch. Because of this there will be a mark at 1.125". That mark won't be identified by a name/number but the 1.00 inch mark will as well as all the other whole inch marks.
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Maybe it is USA. I have not seen the 1.125" else where and I have travelled extensively. C'est la vie.
 
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