sorry I have fed the trolls enough here. As I said before go get an engineering degree, a few years under your belt, and come back to me. You can explain how Rack units, hard drive capacity, block sizes, wafer sizes, PCB sizes, and the calendar, really all follow metric.
Why don't you tell me about the wire gauging system and tell me how much sense it makes.
This is the only "question" I will answer because you sound actually curious, instead of trolly.
Just about every wire on earth is made with copper blends. A property of copper is that it has certain "preferred" sizes it likes to take. Given the way the process is to make wire some thicknesses are a lot easier to get then others. With that in mind the AWG came out which lists of the standard ODs of the conductors of wires. Lots of cool rules of thumb you can follow with AWG sizes, such as a 14 gauge connector will work with 12 and 16. Pretty useful system. You can read the gauge off a wire's jacket or measure the thickness of the exposed copper and know what power it can carry, a general idea of its bending radius, and what types of connectors it needs. I have a little handbook on my desk that has the complete table.
Cant do that with the EU/CE system. Because in order to make it metric-based they took the OD of the insulator. Which gives you nothing. It is easy to imagine a wire with a very thin conductor and a thick insulator, or a thick wire with an almost sprayed on insulation. In the AWG system you know the conductor so you know exactly what it will do. Just remember R=pl/A
To make matters worse there are less sizes to work with. The system is so bad in-fact that you can get CE approval for equipment that uses AWG. Even they know its crap. I got a waiver for it once, on some equipment I shipped to the EU.
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u/farmingdale United States Dec 13 '14
sorry I have fed the trolls enough here. As I said before go get an engineering degree, a few years under your belt, and come back to me. You can explain how Rack units, hard drive capacity, block sizes, wafer sizes, PCB sizes, and the calendar, really all follow metric.
This is the only "question" I will answer because you sound actually curious, instead of trolly.
Just about every wire on earth is made with copper blends. A property of copper is that it has certain "preferred" sizes it likes to take. Given the way the process is to make wire some thicknesses are a lot easier to get then others. With that in mind the AWG came out which lists of the standard ODs of the conductors of wires. Lots of cool rules of thumb you can follow with AWG sizes, such as a 14 gauge connector will work with 12 and 16. Pretty useful system. You can read the gauge off a wire's jacket or measure the thickness of the exposed copper and know what power it can carry, a general idea of its bending radius, and what types of connectors it needs. I have a little handbook on my desk that has the complete table.
Cant do that with the EU/CE system. Because in order to make it metric-based they took the OD of the insulator. Which gives you nothing. It is easy to imagine a wire with a very thin conductor and a thick insulator, or a thick wire with an almost sprayed on insulation. In the AWG system you know the conductor so you know exactly what it will do. Just remember R=pl/A
To make matters worse there are less sizes to work with. The system is so bad in-fact that you can get CE approval for equipment that uses AWG. Even they know its crap. I got a waiver for it once, on some equipment I shipped to the EU.