Lineman Technical Standards and Specifications 2

Question 1

According to NESC rules, what is the minimum vertical clearance for a 7,200-volt distribution line over a public road?

Accepted Answer

22 feet

Answer

NESC requires a minimum vertical clearance of 22 feet for lines up to 22 kV over public roads.

Question 2

Which ASTM standard governs the specification for wood utility poles?

Accepted Answer

ASTM D25

Answer

ASTM D25 is the standard specification for round timber poles used in utility construction.

Question 3

When installing guy wires, NESC specifies that the guy strand must be rated to withstand what percentage of the calculated load?

Accepted Answer

110%

Answer

NESC requires guy strand to be rated for at least 110% of the calculated load to provide a safety factor.

Question 4

What does the term 'Grade B' construction refer to in the NESC?

Accepted Answer

Lines meeting standard utility construction practices for general supply

Answer

Grade B construction in the NESC refers to standard utility construction practices used for general power supply lines.

Question 5

Per IEEE Standard 524, what is the recommended maximum sag tension ratio for ACSR conductor stringing?

Accepted Answer

25%

Answer

IEEE 524 recommends that stringing tension not exceed 25% of the conductor's rated breaking strength to prevent damage during installation.

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