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208 volts is the phase to phase voltage on a three phase low voltage system. In a split single phase service, the voltage is 120/240. In a three phase service, the voltage is 120/208. This is due to using a different transformer configuration. In the above, the first number is the phase to neutral reading, and the second is the phase to phase reading. For example, 120/240 and 120/208 both provide 120v on standard receptacles, but when using a dryer, or hot water heater, for example, that appliance would be using 240v or 208v, respectively.

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16y ago
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11y ago

The key to understanding this is "Phases" and supply configuration.

there r 2 types of supply Transformers, "Y" and "delta" /_\ = triangle

Each one produces 240V single phase across each coil.

In a Y config connecting to 2 legs of the Y produces output from 2 coils that r 120° out of phase. The resulting voltage is 208 volts instead of 240V.

If u connect to a leg and the center u get output from 1 coil only = 120V.

This is why 208 labeling is seen as 208Y/120

Normally, all 3 legs r used and the result is 208V 3 phase.

For a Delta configuration connecting to any 2 end points yields output from only one coil which is 240V single phase. 120v is obtained by center tapping that coil and connecting center to end.

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Q: How do you get 208 voltage?
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What is 208 voltage star?

208 voltage star refers to a three-phase electrical system where the voltage between any two phases is 208 volts. This type of system is commonly used in commercial and industrial applications to power machinery and equipment. Voltage configurations such as 208Y/120V or 208/120V are typical examples of 208 voltage star systems.


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208 is a three phase wye connection voltage. To obtain the each individual coil voltage the 208 is divided by 1.73 which equals to 120 volts. Hence you have 3 phase 208 voltage on the phase legs and 120 volts to the wye point which is grounded. This same formula is used on any 3 phase system. 600/347, 480/277, 208/120.


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Does a 208 volt outlet need a neutral?

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