Hope you are all fine. Mine is a simple doubt,but affects my back ground . We have a 4 Core Cable running for a street lighting circuit ( 6 number 400w/230V HPS lamps in circuit . Alternate poles are connected in alternate phase and neutral is the 4th conductor . ( like p1,p4 in R & p2,p5 in Y & p3,p6 in B ) . If we need to find the load at the end of the circuit ( total load ) we should use 415V(3ph) or 230 V(1ph).We normally use 415 ,but isn't it true that we give a 1phase supply only ? Can some one clarify .