Section 1
• VAC = Volts AC (Alternating Current) • Alternating Current voltage is used to transmit power long distances
• Power from building into the unit is VAC • Control power and lighting power is VAC
• VDC = Volts DC (Direct Current) • Direct Current is used for low voltage control devices • PLCs, Actuators, Displays, etc. • DC voltage can fluctuate between 0 and 24 depending on signal type • Phase • Only applies to VAC • Single phase or three phase • Single phase power is normally used in homes and small businesses • Three phase power is normally used in large commercial and industrial sites
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