Is RCBO necessary for your house?Residual Current Devices RCD Vs MCB
Residual Current Circuit Breaker (RCCB) is a Protection device used to provide
(i)Protection against earth leakage fault
(ii) Protection from electric shock
The basic Principle behind the working of RCCB is Kirchhoff's current law.The operation of RCCB is that the RCCB continuously senses and compares the difference in current values between the live and neutral wires called residual current.
Under normal conditions, in any circuit, the residual current will be zero.
However, under faulty conditions, there will be a difference between the incoming current and outgoing current.
An MCB gives overcurrent and short circuit current protection.
Limitations of RCCB
RCCB are designed to detect residual current
They do not protect against overload current
Hence RCCB must be used in series with an MCB
An RCBO is a single unit which combines the functions of both RCCB and MCB.
RCBO provides
1. Overcurrent and short circuit current protection
2. Detects the earth leakage fault
3. protection from electrical shock
Sensitivity of RCBO is an important factor to be considered before chosing a RCBO. Always it is advised to choose a 30 mA sensitivity for house hold applications for better safety.
Therer are different types of RCBO namely Type AC, Type A ,Type B,Type F depending upon the load type. Type AC can detect only the sinusoidal residual current while Type A can detect both ac sinusoidal residual current and pulsating dc current also.
Some times loads may produced non linear current with harmonics, or high frequency current may be produced. In such cases Type B or Type F can be used. Type F is normally preferred when single phase inverter is used.
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CH1: House wiring- Home distribution board/types of MCB
• House wiring -Main distribution board...
CH2: How to wire Home distribution board/ MCB name plate details
• How to wire a home distribution board...
CH3: Residual Current Circuit Breaker
• How to choose Residual Current Circui...
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