essential components crucial role commercial applications source transformer lt panel prevent failures safety standards smooth operation protect equipment reliable distribution townships importance specific areas main source classified based abnormal conditions automatically interrupt provide control safeguard equipment primary function 690v ac receiving controlling central hub commercial settings distribute power power supply receives power ensure reliability lt panels voltage current metering devices electrical power subdistribution boards distribute power efficiently monitor voltage current subdistribution boards types generator busbars conductors energy consumption components earth faults control circuit breakers fuses voltage panels designed electrical devices machinery ensure longterm performance switching devices allowing faults common types overloads short circuits facility key functions low voltages typically top service provider