Md Nazmul Islam

Purpose Article 100 of the National Electrical Code® (NEC®) provides clear definitions for terms used throughout the Code. Understanding these definitions is essential because NEC requirements depend on how each term is officially defined — not just what it sounds like in everyday language. Key Concepts The NEC uses precise definitions to avoid...

Purpose Article 90 of the National Electrical Code® (NEC®) defines why the Code exists — to ensure electrical systems are safe, reliable, and free from hazards that could cause shock, fire, or injury. It establishes the NEC as a minimum safety standard for electrical design, installation, and inspection. Scope (What the NEC...

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 →...

This diagram shows the internal and external parts of an oil-filled power transformer, an essential device used to step up or step down voltage in electrical systems. The primary winding and secondary winding are wound on the core, which provides a magnetic path for energy transfer.The main tank holds...

This diagram explains how to build a basic 12V audio amplifier circuit using the AN7523N IC. It’s ideal for powering small speakers (like a 6-inch unit) and can be used for home audio projects, DIY speaker systems, or learning amplifier fundamentals. Key Components: IC AN7523N: The main amplifier chip that boosts...

This wiring diagram demonstrates how to automate water tank filling using a water level controller and motor pump. The setup ensures the tank fills automatically when water levels drop and stops when it’s full — saving electricity and preventing overflow. Key Components: Water Level Controller: Detects the water level and controls...

This diagram clearly illustrates how to connect a solar panel system with a charge controller, battery, and inverter to manage both DC and AC power efficiently. It’s a practical setup for off-grid or backup power systems, ensuring safe energy flow from solar panels to household appliances. Key Components: Solar Panel: Converts...

This diagram shows a staircase wiring circuit, a smart setup that allows you to control a single light from two different switches — one at the top of the stairs and one at the bottom. It’s widely used in homes, apartments, and corridors for convenience and safety. Key Components: Two 2-way...

This diagram demonstrates a simple switchboard wiring connection, showing how to properly connect switches and sockets in one board for safe and efficient operation. It helps beginners understand how the phase, neutral, and earth wires are connected for household electrical setups. Key Components: Switch: Controls power to one or more sockets. Sockets:...

This diagram shows the complete wiring setup of a table fan, including the capacitor, resistance, motor, and switch. It helps you understand how each component works together to control the fan’s speed and ensure smooth operation. Key Components: Capacitor: Provides the necessary phase shift for the fan motor to start. Resistance: Helps...

This diagram shows the complete fan wiring connection using a switch, regulator, and 3.3µF capacitor. It demonstrates how to properly wire a ceiling fan for safe operation and adjustable speed control. Key Components: Switch: Controls power to the fan. Regulator: Adjusts the fan speed. Capacitor (3.3µF): Helps start the fan and maintain rotation. 3-Way...

This diagram explains the basic switch board wiring used in homes and offices. It shows how multiple sockets and a switch are connected to a single power source for controlling electrical appliances safely and efficiently. Key Components: Switch: Controls the flow of current to the sockets. Sockets (1, 2, 3): Used for...