Home > LT & HT Motors

LT & HT Motors

Motors

Difference Between Rated Current and Nominal Current

Difference Between Rated Current, Nominal Current, Max Current and Relation with Full-Load Ampere (FLA) and Full-Load Current (FLC) The terms rated current and nominal current sound similar and are often…
Read More »

Motors

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…
Read More »
Motors

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…
Read More »

Motors

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…
Read More »
Motors

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…
Read More »
Motors

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…
Read More »
Motors

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…
Read More »

Motors

Part 9 – Sizing Motor Overload Protection and OCPDs

How to Size Overload Protection for 3-Phase Motors? NEC Article 430, Part III provides guidelines for sizing overload protection devices such as, overload relays, fuses and circuit breakers for motor…
Read More »
Motors

Part 8 – Sizing Motor Feeder Protection and OCPD’s Devices

How to Determine the Size of Feeder Protection Supplying Several Motors? In the previous section, we discussed sizing feeder conductors for multiple motors. This section will explain the step-by-step process…
Read More »
Motors

Part 7 – Sizing Motor Branch Circuit Protection and OCPDs

How to Select OCPDs and Right Size Breaker / Fuse for Motor Overcurrent Protection? Sizing Branch Circuit Protection for Motors The sizing of overcurrent protection devices (OCPDs) for motor branch-circuit…
Read More »

1
2
»