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277 volts is the Hot to Neutral voltage in a 277/480 volt 3-phase "Y" electrical system.

This is a commercial and industrial application voltage.

The purpose of using higher voltages in these applications is to supply higher power levels [watts or kVA] than at lower voltages for the same size of conductor.

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A 277 volt service is used for industrial lighting.

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A 480 volt 3-phase power service is common in factories in USA and other countries which use 60 Hz ac electrical services. If you use the 480 volt service lines in the 'star' or 'Y' configuration you will have a central neutral point to connect a neutral line. You can then get a 277 volt single phase service by using one of the three phase lines along with that neutral

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14y ago
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12y ago

I believe you mean 277v, but 270 would be considered the same thing.

277v is the voltage to ground of one phase of a 3 phase 480v system. If you are not an electrician, don't worry that 3 x 277 is more than 480. Just trust me.

In commercial and industrial installations, 277v is commonly used for lighting and 480v is used for machinery.

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14y ago

It is the leg to ground or (star point) of 3 phase 480 volts. 480/1.73 = 277 volts

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Q: What is 277 volts?
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What voltage reading would you get from a 277 480 volt system?

From a three phase four wire distribution system the voltages would be as follows. From L1 to N - 277 volts. From L2 to N - 277 volts. From L3 to N - 277 volts. From L1 to L2 - 480 volts. From L2 to L3 - 480 volts. From L3 to L1 -480 volts.


What is the purpose of 277 volts AC?

Commercial lighting. In a facility where 3 phase 480 volts is needed for machinery, 277 is also readily available because each leg of 480 to ground is 277 volts. This way numerous supply transformers are not needed in a commercial building.


Will a switching power supply work on 277 volts?

Not unless it is rated for that voltage. You can likely find a step down transformer from 277 volt sto 120 volts.


Is 277 volt one hot wire?

No, 277 volts is the line to neutral of a 480 volt wye three phase system. L1- N, L2 - N and L3 - N will give you 277 volts. L1 to L2. L2 to L3 and L3 to L1 will give you 480 volts.


Can you get 110 volts from 277volts?

The voltage of 277 is the wye connection of a 480 volt three phase supply. The only way to reduce 277 to 120 volts is with a step down transformer.


How do you come up with 277 volts?

The star point or wye voltage of a 480 volt three phase four wire system is 277 volts. The 480 voltage is divided by the sq root of 3 (for 3 phases). The sq root of 3 is 1.73. 480 volts/1.73 = 277 volts. The same formula is used on all three phase four wire systems. 208 volts /1.73 = 120 volts, 416 volts /1.73 = 240 volts, 600 volts / 1.73 = 347 volts.


How can 240 vOLTS power a 277 vOLT light?

Slightly dimmly


In WYE 480VAC each leg to neutral is equal to how many volts?

In WYE 480 VAC each leg to neutral is equal to 277 volts. 480 / 1.73 (sq root of 3) = 277.


What is a 277 volt fluorescent fixture?

A 277 volt lighting fixture is one that is usually used in an industrial application. The reason for this is the voltage rating. A voltage potential of 277 volts is the voltage to neutral (ground) of a three phase four wire 480 volt distribution system. 480 volts / 1.73 = 277 volts. Rather than having to add a transformer to the system to provide 120 volts for lighting, manufactures produced a ballast for fluorescent fixtures that operates on the 227 volt potential.


Can you run single phase 230 from one side of 480 volt 3 phase?

No, you will not obtain 230 volts. From a wye connected three phase 480 volt supply, 277 volts can be obtained from one phase leg and the neutral on the wye connection. 480 volts/1.73 (sq. root of 3) = 277 volts.


Can a 277 unit heater be supplied with 240 volts?

Absolutely not!! 277 volts is developed from a 480 volt power supply employing 1 conductor and a neutral. 240 volt power comprises two hot conductors and NO neutral.


What is the difference between 277 volts and 240 volts?

These voltages are both wye connection three phase voltages. The voltage difference comes from the primary three phase voltage supplies. 277 volts is obtained from 277 x 1.73 = 480 and 240 volts is obtained from 240 x 1.73 = 415. 480/277 volts is a common three phase American voltage. 415/240 volts is a European voltage. In Canada a common three phase voltage is 347/600. The 240 volts could also be a single phase voltage in North America derived from a split phase secondary on a distribution transformer that supplies 120/240 volts to homes.