Each circuit breaker in your electrical switchboard usually protects one or more related circuits against overload, short circuit and earth leakage.
In order to understand what the circuit breaker mcb electricals dealer to burst open (or more commonly known as trip), we first need to understand what a circuit is and what the conditions overburden, short circuit and planet leakage mean.
The electrical installations in our homes are divided into electrically segregated segments known as brake lines. Each circuit provides electricity to equipment in a very well defined and specific group. All the light fittings and light switches are found on one circuit known as the lighting circuit. Air-conditioners, heat and ventilation equipment are grouped on another circuit known as the HVAC circuit. In addition to last but not least, socket outlets are grouped on a circuit known as the power circuit.
Each circuit is made up of cables, switches, connections and other electrical equipment made to carry only the maximum electrical current specified by the manufacturer. When exposed to current exceeding this maximum, the electrical component may break down, melt or catch on fire. Signal breakers were introduced to ensure this does not happen by disconnecting the electricity supply when the electrical current that runs exceeds the maximum capacity that the circuit components can handle.
Have a look around your property at all the socket outlets. The number of appliances are plugged into each socket outlet? Chances are you’ve got more than the circuit is designed for. Our increasing use of electrical and electronic devices puts more pressure on our electric installations every day – sometimes to the point where the amount of electricity we use exceeds the amount that the circuit can safely give us without overheating or getting damaged. When this occurs, the circuit breaker in your switchboard will disconnect the circuit from the electrical supply.
Practically all properties which may have an electricity supply will be fitted with someone unit to distribute electricity to the circuits. Among the primary uses of a consumer unit is that it permits there to be different circuits to be used and individually protected by way of a routine breaker. For example there can be a separate supply of electricity for upstairs and downstairs or even outdoors too. The consumer unit is best described as the centre point for offering the wiring system for those electrical sources situated in the household such as plug sockets, lighting etc.
Originally consumer units housed fuses and were called fuse planks. Miniature circuit breakers have replaced fuses. In the event of an overburden a miniature circuit breaker can be reset by anyone, simply by flicking the switch. A blend would have to be taken out and rewired by a professional which could cost a lot in some cases. A circuit breaker also can be used to disconnect the electricity supply allowing to properly change a light light or replace a put socket for example.
To ensure safe and more reliable circuit protection, a protection device can be used to disconnect the electricity if there is an discrepancy in the electrical current. The device is recognized as an RCD or residual current device. An RCD provides this extra degree of safety as it trips out much quicker than the standard circuit breaker. This device has got the capacities of saving lives as it disconnects so quickly it prevents a person from being electrically shocked. With the new enforcement of the 17th Edition Regulations there needs to be a residual current device installed within the consumer unit. Instead of utilising an RCD you can utilize an RCBO which is a blend of both RCD and a miniature circuit breaker.