Md Nazmul Islam

This diagram explains the impedance behavior of AC circuits, showing how voltage and current signals can differ in magnitude and phase. Impedance represents the total opposition a circuit offers to alternating current, especially when capacitors or inductors are present. It is widely used in AC analysis, filters, signal processing, and power...

A capacitor is an electrical component that stores and releases energy in the form of an electric field. When connected with an inductor, it creates oscillations of energy between electric and magnetic fields, forming the basis of tuned circuits and signal processing applications. Key Components: Capacitor (C): Stores electrical energy in...

This diagram shows a Three Phase Automatic Transfer Switch (ATS) system — a smart electrical setup that automatically switches the power supply between normal power (utility) and alternative power (generator) in case of power failure. It ensures uninterrupted power supply to essential loads, making it ideal for industries, hospitals, offices,...

An inductor is a passive electrical component that stores energy in the form of a magnetic field when electric current flows through it. It typically consists of a coil of wire wound around a core, which can be air, iron, or ferrite. Working Principle When current passes through the coil, a...

Overview When more than three current-carrying conductors are installed together in the same raceway, cable, or bundled group, their ability to dissipate heat decreases. To prevent overheating, the ampacity (current-carrying capacity) of each conductor must be reduced according to the adjustment factors listed in Table 310.15(B)(3)(a). Adjustment Factors Number of ConductorsPercent of Ampacity...

NEC Article 215 explained: how feeders are sized (125% of continuous load), protected, grounded and identified, plus when ground-fault protection is required.

A branch circuit is the wiring between the final breaker or fuse and the outlets. NEC definition, the 4 types, 10–50 A ratings, and the 80% load rule.

Quick Answer NEC Article 200 sets the rules for identifying and using grounded conductors, which in most systems means the neutral. The conductor must be identified by white or gray insulation or three continuous white stripes (200.6), connected with correct polarity (200.11), and tied to ground...

Purpose Article 110 of the National Electrical Code® (NEC®) outlines the fundamental safety requirements for all electrical installations. It ensures that equipment is installed, maintained, and operated safely, reducing risks of shock, fire, or mechanical failure. Key Areas Covered 110.2 – Approval All electrical equipment must be approved by the Authority Having Jurisdiction...

NEC Article 100 is the code's dictionary: how definitions are organized and what key terms like bonding, grounded, service equipment and nominal voltage mean.

NEC Article 90 explained: what the Code covers and excludes, who enforces it, and how to tell mandatory rules (shall) from permissive rules and notes.

Automatic Changeover Switch Connection An Automatic Transfer Switch (ATS) switches power between the main grid and a backup generator to keep the load running without interruption. Key Components Main Grid →...