WISCONSIN (WI) UTILITY CONTRACTOR EXAM
2026–2027 | 300+ REAL PRACTICE QUESTIONS
WITH ANSWERS & RATIONALES | COMPLETE
STUDY GUIDE + FREE PDF ACCESS
WISCONSIN (WI) UTILITY CONTRACTOR EXAM 2026–2027
300+ Real Practice Questions with Answers & RATIONALE | Complete Study
Guide
This study guide contains 300 practice questions designed to simulate the actual
Wisconsin Utility Contractor licensing exam. Work through each question carefully,
review the RATIONALE for every CORRECT ANSWER, and revisit any topic where
you answer incorrectly to build confidence and mastery before exam day.
SECTION 1: SAFETY & OSHA REGULATIONS
1. What is the minimum distance a worker must maintain from an unguarded
energized overhead power line of 50kV or less during utility excavation work?
A. 5 feet
B. 8 feet
C. 10 feet
D. 15 feet
E. 20 feet
CORRECT ANSWER: C. 10 feet RATIONALE: OSHA 29 CFR 1926.1408 requires a
minimum clearance of 10 feet from energized power lines up to 50kV during
construction and utility work. This distance increases for higher voltages.
2. According to OSHA, what is required before any excavation deeper than 5 feet
begins?
A. A written permit signed by the project owner
, B. Notification to local fire department
C. Installation of warning lights around the perimeter
D. Soil testing by a licensed geotechnical engineer
E. A protective system such as sloping, shoring, or trench boxes
CORRECT ANSWER: E. A protective system such as sloping, shoring, or trench
boxes RATIONALE: OSHA 29 CFR 1926.652 mandates that excavations 5 feet or
deeper must have an adequate protective system in place to prevent cave-ins unless
the excavation is made entirely in stable rock.
3. Under Wisconsin safety regulations, how often must a competent person
inspect an excavation site?
A. Once per week
B. Every 72 hours
C. Only before work begins each project
D. After every rainfall event only
E. Daily and after any hazard-increasing event
CORRECT ANSWER: E. Daily and after any hazard-increasing event
RATIONALE: OSHA requires a competent person to inspect excavations daily and
after any event that could increase hazards, such as rain, frost, or equipment vibration.
This ensures ongoing worker protection.
4. Which of the following is NOT a recognized type of protective system for
trenching under OSHA standards?
A. Sloping
B. Shoring
C. Trench shield
D. Sand bagging
E. Benching
,CORRECT ANSWER: D. Sand bagging RATIONALE: OSHA 29 CFR 1926 Subpart
P recognizes sloping, benching, shoring, and trench shields as protective systems.
Sand bagging is not an approved cave-in protection method.
5. What is the maximum depth of a trench that can be left unprotected in Type C
soil?
A. 5 feet
B. 3 feet
C. 4 feet
D. No unprotected depth is allowed in Type C soil
E. 2 feet
CORRECT ANSWER: D. No unprotected depth is allowed in Type C soil
RATIONALE: Type C soil is the least stable classification. OSHA requires protective
systems at any depth in Type C soil because it is fissured, subject to water seepage, or
has been previously disturbed.
6. Which agency enforces occupational safety regulations on utility contractor
job sites in Wisconsin?
A. Wisconsin DNR
B. Wisconsin DOT
C. EPA Region 5
D. Wisconsin DSPS and federal OSHA
E. Wisconsin Public Service Commission
CORRECT ANSWER: D. Wisconsin DSPS and federal OSHA RATIONALE: The
Wisconsin Department of Safety and Professional Services (DSPS) works in
conjunction with federal OSHA to enforce workplace safety on construction and utility
contractor sites in the state.
7. A worker is required to enter a manhole to inspect sewer lines. What
classification does this space fall under?
, A. Open workspace
B. Restricted area
C. Hazardous zone
D. Limited access area
E. Permit-required confined space
CORRECT ANSWER: E. Permit-required confined space RATIONALE: Manholes
meet the OSHA definition of a permit-required confined space under 29 CFR 1910.146
because they have limited entry/exit, are not designed for continuous occupancy, and
may contain hazardous atmospheres.
8. What percentage of oxygen in a confined space atmosphere is considered
immediately dangerous to life and health (IDLH)?
A. Below 18%
B. Below 20%
C. Above 23.5% only
D. Below 19.5% or above 23.5%
E. Below 15%
CORRECT ANSWER: D. Below 19.5% or above 23.5% RATIONALE: OSHA defines
acceptable oxygen levels in confined spaces as 19.5% to 23.5%. Levels outside this
range are considered immediately dangerous to life and health, requiring evacuation or
supplied-air respirators.
9. When is a safety data sheet (SDS) required on a utility contractor job site?
A. Only when chemicals are transported off-site
B. Only for flammable materials
C. Once per year for each chemical
D. When chemicals are stored overnight only
E. Whenever hazardous chemicals are present on the job site
2026–2027 | 300+ REAL PRACTICE QUESTIONS
WITH ANSWERS & RATIONALES | COMPLETE
STUDY GUIDE + FREE PDF ACCESS
WISCONSIN (WI) UTILITY CONTRACTOR EXAM 2026–2027
300+ Real Practice Questions with Answers & RATIONALE | Complete Study
Guide
This study guide contains 300 practice questions designed to simulate the actual
Wisconsin Utility Contractor licensing exam. Work through each question carefully,
review the RATIONALE for every CORRECT ANSWER, and revisit any topic where
you answer incorrectly to build confidence and mastery before exam day.
SECTION 1: SAFETY & OSHA REGULATIONS
1. What is the minimum distance a worker must maintain from an unguarded
energized overhead power line of 50kV or less during utility excavation work?
A. 5 feet
B. 8 feet
C. 10 feet
D. 15 feet
E. 20 feet
CORRECT ANSWER: C. 10 feet RATIONALE: OSHA 29 CFR 1926.1408 requires a
minimum clearance of 10 feet from energized power lines up to 50kV during
construction and utility work. This distance increases for higher voltages.
2. According to OSHA, what is required before any excavation deeper than 5 feet
begins?
A. A written permit signed by the project owner
, B. Notification to local fire department
C. Installation of warning lights around the perimeter
D. Soil testing by a licensed geotechnical engineer
E. A protective system such as sloping, shoring, or trench boxes
CORRECT ANSWER: E. A protective system such as sloping, shoring, or trench
boxes RATIONALE: OSHA 29 CFR 1926.652 mandates that excavations 5 feet or
deeper must have an adequate protective system in place to prevent cave-ins unless
the excavation is made entirely in stable rock.
3. Under Wisconsin safety regulations, how often must a competent person
inspect an excavation site?
A. Once per week
B. Every 72 hours
C. Only before work begins each project
D. After every rainfall event only
E. Daily and after any hazard-increasing event
CORRECT ANSWER: E. Daily and after any hazard-increasing event
RATIONALE: OSHA requires a competent person to inspect excavations daily and
after any event that could increase hazards, such as rain, frost, or equipment vibration.
This ensures ongoing worker protection.
4. Which of the following is NOT a recognized type of protective system for
trenching under OSHA standards?
A. Sloping
B. Shoring
C. Trench shield
D. Sand bagging
E. Benching
,CORRECT ANSWER: D. Sand bagging RATIONALE: OSHA 29 CFR 1926 Subpart
P recognizes sloping, benching, shoring, and trench shields as protective systems.
Sand bagging is not an approved cave-in protection method.
5. What is the maximum depth of a trench that can be left unprotected in Type C
soil?
A. 5 feet
B. 3 feet
C. 4 feet
D. No unprotected depth is allowed in Type C soil
E. 2 feet
CORRECT ANSWER: D. No unprotected depth is allowed in Type C soil
RATIONALE: Type C soil is the least stable classification. OSHA requires protective
systems at any depth in Type C soil because it is fissured, subject to water seepage, or
has been previously disturbed.
6. Which agency enforces occupational safety regulations on utility contractor
job sites in Wisconsin?
A. Wisconsin DNR
B. Wisconsin DOT
C. EPA Region 5
D. Wisconsin DSPS and federal OSHA
E. Wisconsin Public Service Commission
CORRECT ANSWER: D. Wisconsin DSPS and federal OSHA RATIONALE: The
Wisconsin Department of Safety and Professional Services (DSPS) works in
conjunction with federal OSHA to enforce workplace safety on construction and utility
contractor sites in the state.
7. A worker is required to enter a manhole to inspect sewer lines. What
classification does this space fall under?
, A. Open workspace
B. Restricted area
C. Hazardous zone
D. Limited access area
E. Permit-required confined space
CORRECT ANSWER: E. Permit-required confined space RATIONALE: Manholes
meet the OSHA definition of a permit-required confined space under 29 CFR 1910.146
because they have limited entry/exit, are not designed for continuous occupancy, and
may contain hazardous atmospheres.
8. What percentage of oxygen in a confined space atmosphere is considered
immediately dangerous to life and health (IDLH)?
A. Below 18%
B. Below 20%
C. Above 23.5% only
D. Below 19.5% or above 23.5%
E. Below 15%
CORRECT ANSWER: D. Below 19.5% or above 23.5% RATIONALE: OSHA defines
acceptable oxygen levels in confined spaces as 19.5% to 23.5%. Levels outside this
range are considered immediately dangerous to life and health, requiring evacuation or
supplied-air respirators.
9. When is a safety data sheet (SDS) required on a utility contractor job site?
A. Only when chemicals are transported off-site
B. Only for flammable materials
C. Once per year for each chemical
D. When chemicals are stored overnight only
E. Whenever hazardous chemicals are present on the job site
