CME Safety Protocols & Hazard Prevention 3 — Questions and Answers
Question 1: What does the acronym 'SDS' stand for in the context of hazardous material safety?
- Safety Data Sheet (Correct answer)
- Standard Danger Specification
- Site Data Summary
- System Diagnostic Standard
Correct answer: Safety Data Sheet
SDS (Safety Data Sheet) replaced the MSDS format under OSHA's HazCom 2012/GHS alignment.
Question 2: Which NFPA 70E requirement must be completed before energized electrical work is permitted?
- Filing an incident report
- Completing an energized electrical work permit (Correct answer)
- Attending a toolbox talk
- Calibrating all test instruments
Correct answer: Completing an energized electrical work permit
NFPA 70E requires an energized electrical work permit signed by authorized management before performing live electrical work.
Question 3: What is the purpose of an equipment grounding conductor (EGC) in a branch circuit?
- Carry normal load current
- Provide a low-impedance fault path to trip overcurrent protection (Correct answer)
- Increase circuit voltage stability
- Reduce electromagnetic interference
Correct answer: Provide a low-impedance fault path to trip overcurrent protection
The EGC provides a low-impedance return path for fault current, causing the overcurrent device to open and clear the fault.
Question 4: A worker discovers a damaged insulated tool with a cracked handle on site. What is the correct action?
- Wrap it with electrical tape and continue
- Tag it out of service and remove it from the work area (Correct answer)
- Use it only for low-voltage tasks
- Inform the foreman at end of shift
Correct answer: Tag it out of service and remove it from the work area
Damaged insulated tools must be immediately removed from service and tagged out to prevent unintentional use.
Question 5: Under NEC Article 110.26, what is the minimum working space depth in front of a 480V panelboard with exposed live parts on both sides?
- 2 feet
- 3 feet
- 4 feet (Correct answer)
- 5 feet
Correct answer: 4 feet
Condition 3 (live parts on both sides) at 151–600V requires a minimum working space depth of 4 feet per NEC 110.26.
Question 6: What is the primary hazard associated with 'flash blindness' during an arc flash event?
- Permanent corneal damage from UV radiation (Correct answer)
- Ear damage from the pressure wave
- Skin burns from molten metal
- Lung damage from vaporized copper
Correct answer: Permanent corneal damage from UV radiation
Arc flash emits intense UV and visible radiation that can cause flash blindness and permanent corneal damage.
Question 7: Which signal word on a product label indicates the MOST severe hazard level under GHS/HazCom?
- Caution
- Warning
- Danger (Correct answer)
- Notice
Correct answer: Danger
'Danger' is the GHS signal word for severe hazards, while 'Warning' is used for less severe hazards.
CME Safety Protocols & Hazard Prevention 3
What does the acronym 'SDS' stand for in the context of hazardous material safety?