When pulling multiple conductors simultaneously, the pulling tension must be carefully managed to prevent damage to the cables. There is no single, fixed tension value; it is a calculation that depends on several critical factors, including the conductor material, size, and the type of pulling equipment used.

Key Considerations for Multiple Conductors:

• Conductor Material: The maximum allowable tension is directly tied to the conductor material. For copper, a common industry guideline is a maximum stress of 0.008 lbs per circular mil (or 5 kg/mm²), while for aluminum, it is typically 0.006 lbs per circular mil (or 3 kg/mm²).

• Pulling Device: The type of pulling device dictates the maximum allowable tension. A pulling eye or an engineered end fitting attached directly to the conductors can handle higher tensions than a basket-type grip, which relies on the cable's outer jacket. The manufacturer's specifications for the pulling device must always be followed and not exceeded.

• Derating Factor: A critical point for multiple conductors is that the pulling tension may not be evenly distributed among all cables. It is often recommended to apply a derating factor, such as a 20% to 40% reduction, to the total calculated tension for simultaneous pulls to account for this uneven stress and minimize the risk of damage.