2nd year Lineman Apprentice review (The Guidebook for Linemen & Cablemen 2nd Edition)Questions & Answers

2nd year Lineman Apprentice review (The Guidebook for Linemen & Cablemen 2nd Edition) What are 3 electrical clearances to be considered when designing a line? - Answer- 1.) Clearances from the ground, buildings, highways, railways, other circuits, and comm cables. 2.) Standards for minimum clearances between phases, energized parts, the structure and down guys. 3.) Standards for clearances to allow safer work Before digging, what other utilities should be located? - Answer- Electric, Gas, Communications cable, Water, Sewer, Irrigation, Proposed excavation, Survey tape Which wood pole has the larger diameter: class 1 or class 5? - Answer- Class 1 What depth hole is needed in earth to set a 60ft pole? - Answer- 8 Ft. What measures are taken to avoid a pole or truck boom contact when setting a pole in an energized circuit? - Answer- Use equipment and procedures necessary to prevent pole and equipment from making accidental contact. Use safety controls to reduce risk of injury if contact is made What measures are taken to prevent injury to workers on the ground in case a pole or truck boom contact an energized circuit? - Answer- Ground the digger derrick, have the circuit breaker or recloser put in non-reclose position to ensure circuit remains isolated. Person controlling butt of the pole should always be wearing rubbers What 2 factors determine the size or number of guys and anchors needed to hold a pole? - Answer- Size of the conductor, distance of the line to next dead-end Name 3 precautions needed to install a power installed screw anchor. - Answer- What are three basic effects when an electric current flows in a conductor? - Answer- A magnetic field is set up around the conductor, heat is generated to some extent, and a drop in voltage occurs to some extent. Why is the ampacity of a conductor higher in Winter? - Answer- Can carry more current than it can on a hot day. Which of the following characteristics of larger conductors are true? - Answer- 1)There is a greater potential for ice buildup. 2)There is less heat buildup for a given load. 3) wind will have a greater effect on the conductor How does the sag in a transmission line span affect the ampacity of a conductor? - Answer- Conductor sag increases as load increases