Three identical three$-$phase circuits have cables installed in the same trunking. Each circuit has a balanced full load of $48$ A at unity power factor. The circuits are not subjected to simultaneous overload. The end of each circuit is connected to an electrical load that has an exposed conductive part. Each circuit is controlled and protected by a MCCB at its origin, with its earth terminal installed close to the MCCB$.$ Other information of each of the circuits are as follow: Earthing system: TN$-$S Supply voltage: $380/220$ volts Supply frequency: $50$ Hz Ambient temperature: $20$C to $39$C Length of circuit: $60$ metres MCCB instantaneous operation time: $0\mathrm{.}02$ s$.$ Highest fault level in the circuit: $12$ MV A$.$ Earth fault loop impedance measured at the main earth terminal of MCCB: $0\mathrm{.}12$ ohm $0\mathrm{.}3$kW $4\mathrm{.}5$V Cu loss between main ACB & MCCB $3-$cI$>$ voltage drop in upstream ofMCCB Cables for the circuit: Wiring method: single core PVC copper cable to BS $6004$ in trunking and K$-$factor of PVC copper cable is $115.$ Determine, with justification. assumptions and comments clearly stated: a$)$ the desirable current rating of the MCCB; b$)$ the total power delivered by the three identical circuits. c$)$ the desirable size of the live conductors; d$)$ the heat power loss in the each phase conductor; e$)$ the actual $3-$phase voltage difference across the load; f$)$ the maximum earth fault loop impedance based on your suggestion in a$)$; g$)$ the possibility of using the cable size in b$).$to find a protective conductor size meeting your value inf