CFB Safety & Compliance Standards 2

Question 1

Which OSHA standard specifically governs excavation and trenching safety on field construction sites?

Accepted Answer

29 CFR 1926.650-.652

Answer

OSHA 29 CFR 1926.650-.652 (Subpart P) covers excavations, trenching, and shoring requirements for construction sites.

Question 2

A field builder notices a trench is 6 feet deep with no protective system in place. What is the correct immediate action?

Accepted Answer

Stop work and evacuate workers from the trench

Answer

OSHA requires a protective system (sloping, shoring, or shielding) for any trench 5 feet or deeper; workers must be evacuated until it is in place.

Question 3

What does the term 'competent person' mean in the context of OSHA excavation standards?

Accepted Answer

Someone capable of identifying hazards and authorized to take corrective action

Answer

OSHA defines a competent person as one who can identify existing and predictable hazards and has authority to eliminate them.

Question 4

Under NFPA 70E, an arc flash boundary is established to protect workers from which hazard?

Accepted Answer

Incident energy that could cause a second-degree burn

Answer

The arc flash boundary marks the distance at which incident energy equals 1.2 cal/cm², the threshold for a curable second-degree burn.

Question 5

Which document must be completed before workers begin hot work (welding/cutting) on a field construction project?

Accepted Answer

Hot work permit

Answer

A hot work permit authorizes and controls ignition-source activities, ensuring fire watch and extinguisher requirements are met beforehand.

(CFB) Certified Field Builder Practice Test