Lineman Safety Regulations and Compliance 5

Question 1

What is the required minimum distance a mechanical equipment operator must maintain from energized overhead lines up to 50 kV when no electrical hazard assessment has been performed?

Accepted Answer

10 feet

Answer

OSHA 1926.1408 requires a minimum clearance of 10 feet from energized lines up to 50 kV for equipment operators who have not performed a specific electrical hazard assessment.

Question 2

An arc-flash hazard analysis determines the incident energy at a specific work location is 12 cal/cm². What arc-flash PPE category is required?

Accepted Answer

Category 2 (minimum arc rating of 8 cal/cm² — requires layering to meet 12 cal/cm²) or Category 3

Answer

At 12 cal/cm², Category 2 PPE (8 cal/cm² minimum rating) can be used if layered to exceed the incident energy, or Category 3 (25 cal/cm² minimum) provides adequate protection.

Question 3

Under OSHA 1910.269, what is the definition of 'exposed' as it applies to electrical parts?

Accepted Answer

Capable of being inadvertently touched or approached nearer than a safe distance by a person

Answer

OSHA defines exposed electrical parts as those that can be inadvertently touched or approached closer than a safe distance, regardless of whether they are covered.

Question 4

When working in a confined space that may contain an oxygen-deficient or toxic atmosphere, what must be done before entry?

Accepted Answer

Test the atmosphere with a calibrated multi-gas detector and verify a permit is in place if it is a permit-required confined space

Answer

OSHA 1910.146 requires atmospheric testing and a permit system for permit-required confined spaces before entry to protect against oxygen deficiency and toxic gases.

Question 5

A crew discovers an underground cable that was not marked by the utility locate service. What is the safest practice for exposing the cable?

Accepted Answer

Hand-dig (pothole) around the area where the cable is suspected before using mechanical equipment

Answer

Hand-digging (potholing) within the tolerance zone of unmarked utilities is required to avoid damaging buried cables that could be energized.

(Lineman) Lineman Certification Practice Test

(Lineman) Lineman Certification Practice Test

Lineman Safety Regulations and Compliance 5