Should the voltage of L1/N and L2/N sum to the same voltage as L1/L2?

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dmalkokian

Member
Location
Brooklyn
Occupation
Electrical
Should the voltage of L1/N and L2/N sum to the same voltage as L1/L2? I heard it has be a factor of square root of 3
 
dmalkokian said:
Should the voltage of L1/N and L2/N sum to the same voltage as L1/L2? I heard it has be a factor of square root of 3
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Yes, but the two voltages must be added vectorially, not arithmetically.

As infinity said, the √3 comes into play with 3-phase systems.
 
dmalkokian said:
It’s single phase. L1/N and L2/N was 110v. But L1/L2 was 186v. Just trying to understand the calculation behind it.
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Are these measured voltages or just numbers from a calculation? If there just from a calculation there is no such thing as 110 volts.
 
So the building is 3 phase 208Y/120. Phase to phase is 120*1.73. The correct voltages should be 120-N, 208 phase to phase.
 
I misread your post, you are reading two legs of a wye system.
 
dmalkokian said:
We were authorized to test the equipment only. The onsite electricain said that the whole building was receiving 186v.
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Well that's a problem. Was that measurement taken at the service? That would be the only way to determine if the utility was providing the proper voltage.
 
As others have said, the sqrt3 only comes into play if it is two legs of a three phase service you are measuring.
 
Yes the equipment wouldn’t function due to under voltage protection. Was just curious on the calculation of getting 186v between L1/L2
 
If there is a 110 - N voltage present you could be seeing around 186.

110 X 1.73 = 190

Have the utility or someone see what is at the service as Infinity said.
 
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