Electrical Installation Wiring Pictures: 1-Phase ELCB …

The following few pictures and diagrams show the connections of the 1-phase ELCB unit inside a house electrical panel. They are for readers who wish to understand how the electric shock protection devise is connected to their house electrical wiring.

The leakage current (or leakage voltage) usually occurs when there is a defect in a part of the installation, which can be caused by faulty components or by injuries to the insulation of the wiring, cables, electrical appliances or other accessories such as the switches and socket outlets.

When there is leaked current that exceeds the preset value of the ELCB setting, the ELCB then breaks the connection of the incoming electricity supply from the internal house wiring.

This is done automatically within a fraction of a second of the leakage being detected, before the magnitude of the leakage current reaches a level that can cause serious injuries or electrocution.

With a proper use of ELCB, the possibility of serious injuries due to electric shock to a person who accidentally come into contact with energized metal casing of an appliance is minimized.

B. ELCB circuit

An ELCB is not a simple component. Inside the casing of the ELCB unit you can see in Picture 2 above are a number of components. These components are assembled together and wired into a small electrical circuit with a dedicated purpose.

Diagram 3 below shows the internal circuit of a single phase ELCB. This type is one of the most commonly used type in house electrical panels.

However, before I go further, a few points need to be kept in mind throughout this article.

1. When it first came to be used, the ELCB was actually a voltage-operated device that was designed to detect a current leaking through the earth path of electrical equipment and appliances.

Visit link:
Electrical Installation Wiring Pictures: 1-Phase ELCB ...