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E4 Electrical Installation
#1 Power Distribution, Delta and Wye Systems
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Electrical Distribution
200,000 – 400,000 Volts 208/480 Volts Three Phase (3Ø) 7200 Volts Transformer Drops Voltage Transformer Drops Voltage 7200 Volts Substation Transformers Drop Voltage To 7200 Volts 120/240 Volts Single Phase (1Ø) © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Power at the Pole A step-down transformer mounted to a pole can provide normal voltage directly to a building close to the pole When the building is far from the pole, the high voltage is run underground to a transformer near the building © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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1 Pole, 2 Houses, 2 Transformer Types
Line Voltage 7200 Volts Tap for 7200v 7200v Primary Ground Fuse 120/240v Secondary out of transformer Transformer 120/240v underground to electric panel in House #1 7200 Volts underground to transformer at House #2 © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Transformers Following is a picture of an underground service transformer The transformer is stepping down 7200 volts to 120/240 volts Take note of the safety precautions practiced by the power company technician © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Underground Service Transformer
Eye Protection Rubber Arm Shields Thick Rubber Gloves Transformer 7200v Primary 120/240v Secondary © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Electric Meter Meter hub on a residence
© 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Power out to electric panel
Meter Enclosure Power In Electric Meter Power out to electric panel © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Residential Single Phase Power
Following is a diagram of 120/240 volt 1Ø power © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Common Residential 120/240v-1Ø
© 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Electric Panel Inside the building is the electric panel
Circuit breakers distribute the power © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Good Workmanship Counts
Main Breaker Neutral Cable ties Ground Typical 1Ø Electric Panel Smooth bends in the wires Nice Job! Circuit Breakers Bus Bars © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Commercial Power – WYE Wiring
Most commercial applications use the “Wye” power configuration The diagram looks like a “Y” © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Wye Hookups 120/208v-3Ø L1 L3 Wye 4-wire Schematic Diagram
Wye Configuration L1 L2 L3 N N 208v 208v 120v L2 208v 120v 120v 120v 120v 120v 208v 208v 208v © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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Delta Wiring Another commercial configuration is the “Delta”
Its name is derived from the Greek symbol “∆” for Delta Delta wiring has a “high leg” when one particular power leg is used with a neutral © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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4-wire Schematic Diagram
Delta Hookups 120/240v-3Ø Delta Configuration 4-wire Schematic Diagram L1 L1 L2 L3 N N L3 L2 120v 120v 208v 240v 240v 120v 240v 240v 240v 120v 240v 208v © 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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END OF Power Distribution, Delta & Wye Systems
© 2005 Refrigeration Training Services - E4#1 Power Distribution, Delta & Wye Systems v1.1
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