NEC
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Motors
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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Motors
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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Motors
Part 2 – NEC Requirements for Motor Circuits
General Requirements for the Design, Installation, and Protection of Motors, Motor Circuits, Controllers, and Disconnects – 2023 NEC Article 430 As discussed in part 1, motor circuits differ significantly from…
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Motors
Part 1 – Motor Load Circuits: NEC Terms and Terminologies
NEC Terms and Basic Terminologies Used in Motor Load Circuits Before designing an effective motor circuit that operates as expected based on analysis and calculations, it is important to understand…
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Electrical Wiring
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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Electrical Wiring
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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Electrical Wiring
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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Electrical Wiring
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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Lighting
How to Calculate the Floor Area For General Lighting?
Determining the Floor Area of a Dwelling Unit For General Lighting – Solved Example Based on NEC-2023 Sizing Floor Area for Lighting Determining the number of general lighting circuits in…
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Lighting
How to Determine the Number of Lighting Branch Circuits?
How to Determine the Number of Lighting Branch Circuits for Dwelling and Non-Dwelling Units – NEC 2023/2026 According to NEC Article 100 – Definitions, a branch circuit refers to the…
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