Attention: Roto204 (Nate)

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"Neutral" serves as the "return" for the power-Neutrals are usually grounded-required by codes.However-you can put an "amp-Clamp" type ammeter on the neutral on an operating 3ph system-you can read some flow there-harmonics or unbalanced loads--Don't touch that neutral and ground though-you will get a shock.Its like you can take any phase of a 3ph 208V system and measure 120V to ground.480V will measure 277V to ground or neutral-same as the 208V.The Green cable ground is the "safety" path for the power to go-and to trip overcurrent devices-fuses and circuit breakers,GFI's.In the "Y" system-one end of the transformer winding goes to neutral or ground.The center connection of the "Y".
 
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