Lineman Technical Standards and Specifications 5

Question 1

What is the maximum conductor temperature limit for ACSR conductor at continuous normal rating per IEEE Std 738?

Accepted Answer

100°C

Answer

IEEE Std 738 and standard utility practice typically limit ACSR conductor continuous normal operating temperature to 100°C to protect aluminum tensile strength.

Question 2

Which NEMA standard applies to overhead distribution switchgear such as padmount switches and sectionalizers?

Accepted Answer

NEMA SG-4

Answer

NEMA SG-4 covers alternating current high-voltage circuit breakers, including overhead distribution switchgear.

Question 3

Per NESC Rule 230, what load combination defines the 'extreme wind' loading case for structure design?

Accepted Answer

No ice with wind at 90 mph and 60°F temperature

Answer

The NESC extreme wind case uses no ice load with a high wind speed (based on regional ASCE 7 maps, typically 90+ mph) at 60°F.

Question 4

What does ANSI C37.42 govern in relation to lineman work on distribution systems?

Accepted Answer

Specifications for distribution cutouts and fuse links

Answer

ANSI C37.42 covers specifications for distribution cutouts (expulsion fuses) and their interchangeable fuse links used in overhead distribution systems.

Question 5

What is the standard neutral conductor size relative to the phase conductor for a 4-wire multigrounded wye distribution system under common utility practice?

Accepted Answer

Two gauge sizes smaller than the phase conductor

Answer

Common utility practice and NESC sizing guidance result in a neutral conductor typically two AWG sizes smaller than the phase conductor for 4-wire multigrounded systems.

(Lineman) Lineman Certification Practice Test

(Lineman) Lineman Certification Practice Test

Lineman Technical Standards and Specifications 5