Electrical Design
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Part 4 – Calculating Locked Rotor Current (LRC) for Motors
How to Determine the Value of Locked-Rotor Current (LRC) for Induction Motors? What is Locked-Rotor Current (LRC)? Locked-rotor current (LRC) is the maximum starting current drawn by an electric motor…
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Part 3 – Understanding NEMA Motor Nameplate Data and Marking
How to Read NEMA Motor Nameplates Data Printed on It for Motor Circuits? What is NEMA? NEMA (National Electrical Manufacturers Association) is a U.S.-based trade association that develops and publishes…
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What is the Difference Between 15-Amp and 20-Amp Outlet?
Difference Between 15-Amp and 20-Amp Outlets and Receptacles Electrical wiring installations, equipment, devices, and other electrical systems for residential and commercial applications in the United States differ significantly in complexity…
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Why is the Long Prong Neutral Instead of the Narrow Prong?
Why is the Wide Prong and Slot Designated as Neutral Instead of the Narrow Prong and Slot in a Plug and Outlet? Engineers typically avoid making arbitrary choices when designing…
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Why is the Neutral Prong or Slot Wider on a Plug or Outlet?
Why is the Neutral Prong and Slot Longer than the Hot Prong and Slot on a Plug and Outlet or Receptacle? Although the electrical power supply and distribution system in…
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Why are there Grooved Slots in the Pins of Two Pin Plugs?
Why are the Pins are Slotted in the 2 or 3-Pin Plugs? Threaded slots are commonly found in Type A, Type B, Type C (Europlug), Type E/F, and Indian standard…
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How to Size a Branch Circuit Conductors with Protection?
Sizing of Branch Circuits and Conductors with Protection Supplying from OPCD to the Final Load Point Branch Circuit According to NEC 100 – Definitions, branch circuits are the circuit conductors…
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How to Size Feeder Conductors with Overcurrent Protection
Sizing of Feeder Conductors with Protection Supplying from Main Panel to the Subpanel or Branch Circuits Feeder Conductors According to NEC 100 – Definitions, feeders are all circuit conductors between…
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How to Size Service-Entrance Conductors and Feeder Cables?
Sizing of Service-Entrance Conductors, Feeders and Service Disconnecting Means Service-entrance conductors for the service disconnect and main panel, as well as feeder cables for subpanels, must be properly sized in…
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How to Size Equipment Grounding Conductor (EGC)?
What is Equipment Grounding Conductor? Sizing EGC for Grounding Systems The Equipment Grounding Conductor (EGC) is a main part of the electrical bonding and grounding system, ensuring the safe dissipation of…
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