What type of pulling heads utilize opposing set screws to secure the conductor?

Mechanical pulling heads are designed to secure the conductor using opposing set screws. This method of securing ensures a tight grip on the conductor, preventing slippage during the pulling process. The use of opposing set screws allows for even distribution of pressure, which keeps the conductor firmly in place without damaging its insulation or integrity.

This mechanical approach is especially useful in applications where the conductor needs to be pulled through conduits or other restraining environments, as it allows for more control over the pulling process. In contrast, electrical, pneumatic, and hydraulic pulling heads utilize different mechanisms and principles for securing conductors, such as electrical impedance, compressed air, or hydraulic pressure, which do not rely on the straightforward and reliable method of set screws.