Electrical Design
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When and Why Did the U.S. Transition from 110V to 120V Supply?
Why Did the Voltage Level Increased from 110V to 120V in North America? Electric power transmission and distribution is not as straightforward in the U.S. as it is in IEC-following…
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Why Did Japan Choose 100V over 120V or 230V?
Why Does Japan Use 100V as the Standard Voltage? Power System in Japan Japan has a unique and somewhat unusual electric power transmission and distribution system. The standard voltage in…
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What is the Main Difference Between FLA and FLC?
Difference Between Full Load Amperes (FLA) and Full Load Current (FLC) When working with electric motors and related equipment, professionals often encounter the terms FLA and FLC. Though sometimes used…
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Difference Between Direct-On-Line (DOL) and Star Delta Starter
Comparison Between Direct-On-Line (DOL) and Star Delta Motor Starting Methods It is well known that induction motors draw a high inrush current during the initial starting phase. This temporary transient…
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Difference Between NEMA and IEC Motor Starters & Contactors
Comparison Between NEMA and IEC Contactors, Controllers and Motor Starters Motor starters, controllers, and contactors are essential components used to control electric motors in industrial, commercial, and general electrical systems.…
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Part 14 – How to Size Star-Delta Starter for Motors?
Sizing a Star-Delta Starter with Contactors for a 3-Phase Motor A Star-Delta starter is used to reduce the inrush current when starting large three phase motors. The starting current of…
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Part 13 – How to Size DOL Starter for Three-Phase Motors?
Sizing Direct-On-Line Starter with Contactor, Fuse, Circuit Breaker and Overload Relay for 3-Phase Motors – NEC & IEC DOL Starter A DOL starter (also known as Direct-On-Line or across the…
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Part 12 – Sizing Motor Starter & Contactor – NEMA – NEC
How to Size a Motor Starter, Contactor and Controller? NEMA – NEC Motor starters and controllers are a combination of devices in a single unit to safely start, run and…
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Part 11 – Sizing Disconnecting Means for Motor & Controller
How to Size Disconnecting Switch, Fuse & Breaker for Motors and Controllers Disconnecting Means for Motors & Controllers Although we know that the motor disconnecting means can be sized based…
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Part 10 – Overcurrent Protection for Motor Control Circuits
How to Size Short Circuit and Overload Protective Devices for Motor Control Circuit Conductors? According to 430.75(A), motor control circuit must have a disconnect. If the motor control circuit conductors…
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