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Tool Talk Discussion Forum

Re: Different 3-phase question

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JMOR

04-22-2013 12:25:54
72.181.173.171



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"Assuming the red leg is L2 and 208 volts to ground and L1 and L3 read 110 to ground. What would you read from L1 to L2?"

It is a fixed math calculation. A matter of summing the vectors (phasors), sines, cosines. Your set of numbers do not fit the math. IF you actually had 110 for L1 to N and L3 to Neutral, then the math would yield 190.5 for high-leg, not 208. And if high leg were 208, then L1/L3 to neutral would be 120.

In either case, L1 to L2 to L3 & L3 to L1 would be equal at 220, or 240.

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John T

04-22-2013 14:24:18
216.249.82.117



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 Re: Different 3-phase question in reply to JMOR, 04-22-2013 12:25:54  
These guys are just having trouble with the MATH as you correctly point out. The figures I keep using are typical and nominal (based on math such as the 208 derives from 120 x square root of 3 etc) and science, but that dont mean any given voltmeter is gonna yield those exact results. The laws of physics and math must apply and the Y and Delta configurations I keep quoting them are correct based on vector sums and pretty basic trig etc. Also a non electrical person has a tough time with Y versus Delta when they start throwing out figures they heard about somewhere down at the pool hall.

But hey God Bless them all, they have some good questions, and I still try my best to help and will keep doing so and thanks to you also

John T

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