Mike Dolt Enterprises
Mike Dolt Enterprises
User: premgin, Location: Chapel Hill, NC
Asked on: Monday, April 25, 2011 at 5:46 am EDT
Answered on: Tuesday, May 14, 2024 at 4:35 am EDT
Question: 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 .
To calculate the total load at the end of the circuit, you should use the voltage that is being supplied to the lamps, which is 230V (1 phase).Even though there are 3 phases (R, Y, and B) and a 4-core cable is used, the lamps are connected in parallel across the phase and neutral conductors. This means that each lamp receives a 230V supply, and the total load is the sum of the individual lamp loads.Using 415V (3 phase) would be incorrect because it would not take into account the fact that the lamps are connected in parallel and are receiving a 230V supply. Flag for review