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While laying 11 kV underground cable with the diameter D, the minimum bending radius must be
3D
6D
12D
18D
12D
C is correct because the standard code for installing 11┬аkV underground cables specifies that the minimum bending radius must be 12 times the cable diameter to ensure the integrity of the insulation.
Voltage rating of the underground cable = 11 kV, Diameter of the cable = D
RminтАЛ=k├ЧD
Identify Cable Specification
The bending radius of an underground cable is constrained by the voltage rating to prevent mechanical stress on the insulation and conductors. For an 11┬аkV cable, specific standards such as IS 1255 apply.
V=11┬аkV
Apply Bending Radius Factor
According to the Indian Standard (IS) codes for high voltage underground cables, the recommended minimum bending radius is generally defined as a multiple of the overall cable diameter D.
k=12
Calculate Minimum Bending Radius
By substituting the factor into the formula RminтАЛ=k├ЧD, we obtain the requirement for 11┬аkV cables.
RminтАЛ=12D
C is correct because the standard code for installing 11┬аkV underground cables specifies that the minimum bending radius must be 12 times the cable diameter to ensure the integrity of the insulation.
This concept is critical in Power System design; recall that bending radii increase with voltage levels because thicker insulation layers are more susceptible to cracking if bent too sharply.