Wiring Diagram Of Mcb. Mcb is a mechanical switching device which can carry and break currents under normal circuit conditions and also under specified abnormal conditions such as overload and short circuit. Wiring diagram of single phase distribution board with rcd in nec us iec uk eu electrical wiring color codes double pole mcb dp the isolator or main switch this is the main operating switch which is used to.
The over and undervoltage auxiliary is mounted on the left side of the associated hager mcb rccb rcbo. The x symbol at the end of the line actually denotes the type of switching device. Mcb is a mechanical switching device which can carry and break currents under normal circuit conditions and also under specified abnormal conditions such as overload and short circuit.
These are defined in iec 60617 also adopted in many countries as a european norm such as bs en 60617 or sfs en 60617 for britain and finland respectively.
As you see in the below diagram a two pole mcb is connected after the energy meter. Ndm1 series miniature circuit breaker is used in low voltage terminal distribution for industry civil building energy telecommunication and construction to do protection from short circuit and overload to control to disconnect and protect dc systems. In the diagram is shown the method of wiring distribution mainboard form utility pole to energy meter and then dp circuit breaker and sp mcb breaker. Split load some circuits using mcbs protected by an rcd.