Advanced Rigging – Transmission & Distribution

Rigging Forces and Tensions Part 1 Identify and describe two types of loads involved in rigging for line work. Describe how to determine the weight exerted by a conductor on an insulator. Rigging Forces and Tensions Part 2 Define the term ôline tensionö and explain how to determine the line tension exerted by a conductor. Define the term ôbisect tensionö and describe how bisect tension can be determined by measuring distances. Rigging Forces and the Safety Factor Describe how to use a bisect tension formula to determine the bisect tension exerted on a corner pole. Describe how to determine the approximate bisect tension exerted on a corner pole by finding the approximate angle of the line at the pole and using a ôrule-of-thumbö chart. Define the term ôguy tensionö and describe how to determine the approximate guy tension required to hold against line or bisect tension. Define the term ôsafety factorö in terms of rigging for line work and describe how to calculate the safety factor for a given job. Weight and Tension Calculations Describe how conductor weight is affected when a conductor is raised or lifted to a new pole. Describe how to determine the weight and bisect tension exerted by conductors when they are moved to a new pole. Describe how to determine the guy tension needed to offset the bisect tension exerted by conductors after they are moved to a new corner pole. Explain how to establish a safety factor of 5 for the rigging used to lift a conductor and move it to a new pole.