3 Phase Distribution Board Wiring Diagram

What is Three Phase & Single Phase Power?

In power generation plants, 3 section power is a generator by electrical generator or generator. In Associate in Nursing generator, the generated voltage and current by 3 freelance coils within the mechanical device square measure apart by a hundred and twenty degrees from one another. The generated power from alternators then transmitted and distributed through transmission and distribution lines to the sub-distribution.

In industrial and industrial buildings, they have high power. in order that they square measure connected to the three-phase Delta connection(3 section – three Wire System – No Neutral Wire) before distribution electrical device and so manage the specified voltage and current in line with their desires in three-phase and single-phase offer.

On the opposite hands, buildings that require high power in three-phase and single-phase, they’re connected to the secondary of the distribution electrical device. This way, they get three-phase Star association (3-Phase, four Wire System with Neutral Wire). within the Star association, 3 section Line to Line (Phase to Phase) voltage square measure 415V AC (in US, 208V) and Single section Line to Neutral (Phase to Neutral), there square measure 230V AC (120V within the US).

In 3 section offer, motors and huge electrical heaters are often directly connected to the 3 sections whereas, in Single Phase, load (Light, fan etc) are often connected in between section and Neutral through correct protecting devices.

Why We Need Three-Phase Power Supply?

To operate high power instrumentation and appliances like electrical motors and high power rated compressor etc, we want Three-Phase Power to offer rather than Single part Power offer. In standard homes, we tend to largely use Single part power offer to control lighting load, fans, laundry machines etc, however in some cases likewise as industries offices high force motors, multi-story buildings, 3 part power offer must operate and maintain the system.

In our previous posts, we tend to did it for Single part electrical wiring installation in home and already apprehend that what area unit MDB, DB, Final Sub Circuit, MCB, MCCB, CB, and RCD etc.

MDB Panel

An MDB may be a panel or enclosure that homes the fuses, circuit breakers and ground run protection units wherever the current, that is employed to distribute electric power to various individual circuits or shopper points, is taken in from the electrical device or Associate in Nursing upstream panel. Associate in Nursing MDB generally has single or multiple incoming power sources and includes main circuit breakers and residual current or earth run.