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1. |
A single core lead covered cable is to be designed for 132 kV to earth. Its conductor radius is 20 mm and its insulating material A, B and C have relative per mittivities 5, 4 and 3 respectively and corresponding maximum permissible stresses of 3.6, 2.4 and 2.0 kV/mm (rms) respectively. The minimum diameter of the lead steath will be _______ mm |
A. | 173.78 mm |
B. | 1738 mm |
C. | 1.7378 mm |
D. | 173.8 mm |
Answer» B. 1738 mm | |