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VOLTAGE DROP ANSWERS 2

Q1. Consumer mains = Vd = 14m x 40A x (2.55 x 1.155) / 1000 = 1.64V @ 230V (Table 41 V90)

Final sub-circuit = Vd = 23m x 9A x (16.4 x 1.155) / 1000 = 3.92V @ 230V (Table 42 V90)

Total voltage drop = 1.64V + 3.92V = 5.56V (This is acceptable bacause its under 5% of 230V)

 

Q2. Consumer mains = Vd = 24m x 32A x (4.05 x 1.155) / 1000 = 3.59V @ 230V (Table 41 V90)

Final sub-circuit = Vd = 23m x 6.95A x (16.4 x 1.155) / 1000 = 3.02V @ 230V (Table 42 V90)

Total voltage drop = 3.59V + 3.02V = 6.61V (This is acceptable bacause its under 5% of 230V)

 

Q3. Consumer mains = Vd = 40m x 65A x 1.12 / 1000 = 2.91V @ 400V (Table 41 V75) (No need to convert the Vc to 230V)

Final sub-circuit = Vd = 34m x 7.5A x 10.2 / 1000 = 2.6V @ 400V (Table 42 V90) (No need to convert the Vc to 230V)

Total voltage drop = 2.91V + 2.6V = 5.51V (This is acceptable bacause its under 5% of 400V)