1 air conditioning three phase power. 2 most common in commercial and industrial buildings three hot...
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Air ConditioningAir Conditioning
Three Phase PowerThree Phase Power
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Three Phase PowerThree Phase Power
• Most common in commercial and industrial buildings
• Three hot legs, one ground, and one neutral
• L1, L2, L3, N, and Ground
• Most common in commercial and industrial buildings
• Three hot legs, one ground, and one neutral
• L1, L2, L3, N, and Ground
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3Two types of transformer hook ups
Delta(OLD) Wye(NEW)
Two types of transformer hook ups
Delta(OLD) Wye(NEW)
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208 Volt 208 Volt
• Three basic types of three phase power that you may encounter– 208V-3 phase-60Hz (Wye)– 240V-3 phase-60Hz (Delta)– 480V-3 phase-60Hz (Wye)
• Three basic types of three phase power that you may encounter– 208V-3 phase-60Hz (Wye)– 240V-3 phase-60Hz (Delta)– 480V-3 phase-60Hz (Wye)
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208V-3 phase-60Hz (Wye)208V-3 phase-60Hz (Wye)
• Common in newer commercial buildings that require three phase power for large equipment, but also need many 120 volt circuits.
• Common in newer commercial buildings that require three phase power for large equipment, but also need many 120 volt circuits.
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• Power Configuration – 208V 3 Phase– 208V Single Phase – 120V Single Phase
• For single phase power use 2 leads – 2 Hot legs (208V)– One hot leg and neutral (120V)
• Power Configuration – 208V 3 Phase– 208V Single Phase – 120V Single Phase
• For single phase power use 2 leads – 2 Hot legs (208V)– One hot leg and neutral (120V)
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480V-3 phase-60Hz (Wye)480V-3 phase-60Hz (Wye)• Common in industrial buildings
where high voltage is desirable, large amounts of fluorescent lighting (277V) are needed, and minimal 120 volt circuits are needed.
• Common in industrial buildings where high voltage is desirable, large amounts of fluorescent lighting (277V) are needed, and minimal 120 volt circuits are needed.
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• Examples of equipment used in HVAC:– Evaporator fans – Compressor– Condenser fans (277V)
• Examples of equipment used in HVAC:– Evaporator fans – Compressor– Condenser fans (277V)
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• Power Configurations– 480V three Phase – 277V single Phase* Separate transformer in
building needed to supply 120 volt power.
• Power Configurations– 480V three Phase – 277V single Phase* Separate transformer in
building needed to supply 120 volt power.
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240V-3 phase-60Hz (Delta)
240V-3 phase-60Hz (Delta)• Found in older commercial and industrial buildings
• Contains one high leg or wild leg • The wild leg should always be
phase B in the panel • Center leg or wild leg should be
orange• Do a safety check first
• Found in older commercial and industrial buildings
• Contains one high leg or wild leg • The wild leg should always be
phase B in the panel • Center leg or wild leg should be
orange• Do a safety check first
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• Care must be taken between wild leg and neutral– Wild leg to neutral is 180V-200V– Not usable voltage – Should be identified orange.
• Always check with your volt meter when working on any three phase system
• Each leg to neutral or ground
• Care must be taken between wild leg and neutral– Wild leg to neutral is 180V-200V– Not usable voltage – Should be identified orange.
• Always check with your volt meter when working on any three phase system
• Each leg to neutral or ground
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