7. A final circuit feeding a 3-phase lift equipment is shown in Figure below. The incoming voltage supply at the main DB

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7 A Final Circuit Feeding A 3 Phase Lift Equipment Is Shown In Figure Below The Incoming Voltage Supply At The Main Db 1 (61.52 KiB) Viewed 51 times

7. A final circuit feeding a 3-phase lift equipment is shown in Figure below. The incoming voltage supply at the main DB is allowed to be within + 6% of the nominal voltage. (a) Calculate the minimum and maximum required operating voltage supply at the terminals of the lift equipment. (b) If the incoming voltage supply at the main DB is dropped to its minimum allowable voltage level, can the lift equipment still function? Assume that the cable resistance is 13 m2/m. (c) What would happen to the lift equipment if the ambient temperature increases, and the cable resistance is now increased to 14.5 m2/m? Main DB 400 V ±6% AC 40 A TPN MCB Length of Cable = 60 m 3-phase lift equipment IFL = 20 A Required operating voltage supply = ±10% of 400V AC (ans. :max. 440V, min. 360 V, Yes, can't work)