DCI Safety Practices & Procedures 2 — Questions and Answers
Question 1: When working in a ceiling plenum space, which respiratory hazard is most commonly encountered during cable installation?
- Carbon monoxide from HVAC systems
- Fiberglass particles from insulation disturbance (Correct answer)
- Ozone from electrical equipment
- Hydrogen sulfide from old wiring
Correct answer: Fiberglass particles from insulation disturbance
Disturbing fiberglass insulation in plenum spaces releases fine particles that can be inhaled, requiring appropriate respiratory protection.
Question 2: A cable installer notices a junction box with a missing knockout and exposed wiring. What is the correct first action?
- Tape over the opening with electrical tape
- Continue working and report it at end of day
- Stop work in the area and notify the site electrician or supervisor (Correct answer)
- Install a cable grommet to cover the opening
Correct answer: Stop work in the area and notify the site electrician or supervisor
Exposed electrical wiring is an immediate shock hazard; work must stop and a qualified electrician must address the issue before continuing.
Question 3: Which class of fire extinguisher is appropriate for an electrical fire in a server room?
- Class A
- Class B
- Class C (Correct answer)
- Class D
Correct answer: Class C
Class C extinguishers use non-conductive agents suitable for energized electrical equipment fires.
Question 4: When must a cable installer use a Ground Fault Circuit Interrupter (GFCI) protected outlet?
- Only when working outdoors
- Whenever working near water or in damp locations (Correct answer)
- Only when using power tools over 20 amps
- Only on circuits rated 240V or higher
Correct answer: Whenever working near water or in damp locations
GFCI protection is required by OSHA and NEC whenever power tools are used in wet or damp environments to prevent electrocution.
Question 5: What does the Safety Data Sheet (SDS) Section 8 provide information about?
- First aid measures
- Exposure controls and personal protective equipment (Correct answer)
- Physical and chemical properties
- Handling and storage guidelines
Correct answer: Exposure controls and personal protective equipment
SDS Section 8 covers exposure limits, engineering controls, and required PPE for safe handling of hazardous materials.
Question 6: A technician needs to drill through a fire-rated wall assembly. What must be done after routing the cable?
- Apply cable ties every 12 inches on both sides
- Seal the penetration with listed firestop material (Correct answer)
- Cover the hole with a decorative wall plate
- Label the cable on both sides of the wall
Correct answer: Seal the penetration with listed firestop material
Fire-rated walls must have all penetrations sealed with UL-listed firestop systems to maintain the wall's fire resistance rating.
Question 7: Under OSHA standards, what is the minimum safe approach distance from unguarded overhead power lines carrying up to 50kV for unqualified workers?
- 3 feet
- 10 feet (Correct answer)
- 25 feet
- 50 feet
Correct answer: 10 feet
OSHA 1926.416 requires unqualified workers to maintain a minimum 10-foot distance from energized overhead lines up to 50kV.
DCI Safety Practices & Procedures 2
When working in a ceiling plenum space, which respiratory hazard is most commonly encountered during cable installation?