Reason for preferring 3 wire over 2 wire dc distribution system

Q.  Assertion (A): 3 wire dc distribution system is preferred over 2 wire dc distribution system.

Reason (R):  the 3 wire dc system of distribution is more safe.

- Published on 23 Nov 15

a. Both A and R are true and R is the correct explanation of A
b. Both A and R are true and R is not the explanation of A
c. A is true but R is false
d. A is false but R is true

ANSWER: A is true but R is false


  • bilal   -Posted on 25 Dec 17
    It is known that higher the voltage level, lower are the transmission losses. But in case of d.c. distribution, level cannot be increased readily like a.c. Using rotating machinery, the d.c. voltage level can be increased but the method is too expensive. The d.c. three wire system can be used to double the transmission voltage, without increasing the voltage between either conductor and earth. The higher voltage demand also can be satisfied using d.c. three wire distribution system.

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