Lineman Technical Standards and Specifications 4

Question 1

Per NESC Table 232-1, what is the minimum horizontal clearance between a 12.47 kV conductor and the side of a building?

Accepted Answer

3 feet

Answer

NESC Table 232-1 requires a minimum horizontal clearance of 3 feet from conductors to the side of buildings for voltages up to 15 kV.

Question 2

What ANSI standard specifies the requirements for transformer connections and voltage ratings on distribution systems?

Accepted Answer

ANSI C57.12.20

Answer

ANSI C57.12.20 covers overhead-type distribution transformers, including voltage ratings, connections, and performance requirements.

Question 3

In the context of conductor stringing, what does 'sagging to final sag' mean?

Accepted Answer

Adjusting conductor sag to the values at the expected everyday temperature after creep

Answer

Final sag accounts for the expected creep (permanent elongation) of the conductor over time, typically at the assumed average everyday temperature.

Question 4

What is the purpose of the NESC 'loading district' classification (Heavy, Medium, Light)?

Accepted Answer

Defining ice, wind, and temperature load combinations for structural design

Answer

NESC loading districts define the combined ice thickness, wind pressure, and temperature loads used to calculate mechanical loads on overhead line structures.

Question 5

Which IEEE standard provides guidance for the testing and evaluation of overhead transmission line conductor vibration and fatigue?

Accepted Answer

IEEE Std 664

Answer

IEEE Std 664 is the guide for laboratory measurement of the power dissipation characteristics of aeolian vibration dampers for single conductors.

(Lineman) Lineman Certification Practice Test

(Lineman) Lineman Certification Practice Test

Lineman Technical Standards and Specifications 4