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Published byDella Houston Modified over 9 years ago
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Electrical Power Distribution in America
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49.9 % Coal 20.4% Nuclear 20.3% Natural Gas 6% Hydro Electric 3.4% Other http://www.eia.doe.gov/emeu/mer/pdf/pages/sec7_4.pdf
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Power Plant Generation Turbines Output 11KV to 22KV
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Generated Power Distribution Power Plant Turbine Output Voltage Transformed to Higher Voltage 155,000 volts to 765,000 Volts Higher voltage, lower current = less line loss
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End User High Distribution Voltage Transformed Down Common Commercial Substation Voltage 12,000 Volts Residential 7,200 Volts
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Commercial End User Transformed From 12,000 Volts, 3 Phase 480/277 Volts Three Phase 208/120 Volts Three Phase
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480/277 Volt Rules of Thumb Phase Conductors Marked Brown, Orange, Yellow Brown, Orange, Yellow Neutral – White Ground – Green Brown to Orange, Yellow to Orange, or Yellow to Brown Voltage reading between phases (Brown to Orange, Yellow to Orange, or Yellow to Brown) 480 volts Brown to White, Orange to White, or Yellow to White Voltage reading phase to neutral (Brown to White, Orange to White, or Yellow to White) 277 volts
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208/120 Volt Rules of Thumb Phase Conductors Marked Black, Red, Blue White - Neutral Green – Ground Voltage Reading Between Phases (Black to Red, or Red to Blue or Black to Blue) 208 Volts Voltage Reading Phase to Neutral (Black to White, Red to White, Blue to White) 120 Volts
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Residential End User Transformed From 7,200 Volts 240/120 Volts Single Phase
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Residential Single Phase 3 Wire’s coming into your home Black and Red Wires are Hot 1 White is Neutral Voltage between the two hot wires (Black to Red) 240 volts Voltage between hot and neutral (Either the Black to White or the Red to White) 120 volts
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