3. A 220V, 1-phase submain circuit is used to provide the power supply of a workshop. The estimated full load power consumption of the workshop is 13kW. The submain circuit is wired by single-core PVC copper cables which are enclosed in trunking with 2 other similar circuits at an ambient temperature of 35°C. MCB is used as the protective device for this submain circuit. Determine: (a) the rating of the MCB for the submain circuit; (available MCB ratings for selection: 32 A, 40 A, 50 A, 63A, 100A) (b) the minimum cable size for the submain circuit if allowable voltage drop is limited to 2% of nominal supply voltage and the length of the submain circuit is 63 m.

3. A 220V, 1-phase submain circuit is used to provide the power supply of a workshop. The estimated full load power consumption of the workshop is 13kW. The submain circuit is wired by single-core PVC copper cables which are enclosed in trunking with 2 other similar circuits at an ambient temperature of 35°C. MCB is used as the protective device for this submain circuit. Determine: (a) the rating of the MCB for the submain circuit; (available MCB ratings for selection: 32 A, 40 A, 50 A, 63A, 100A) (b) the minimum cable size for the submain circuit if allowable voltage drop is limited to 2% of nominal supply voltage and the length of the submain circuit is 63 m.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.33MCQ: The direct electrical connection of the windings allows transient over voltages to pass through the...

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