The maximum pulling tension for an 11kV cable is a critical calculation that depends on the conductor's cross-sectional area and material (copper or aluminum). The formula is:

Tmax=K×S

Where:

• Tmax is the maximum allowable tension in Newtons (N).

• K is a constant based on the conductor material:

  • K=50N/mm2 for copper conductors.

  • K=30N/mm2 for aluminum conductors.

• S is the total cross-sectional area of the conductors in mm2.

Adhering to this limit is paramount. Pulling an 11kV cable beyond this tension can stretch the conductor and cause irreparable damage to the insulation, leading to premature cable failure.