CSLB C-20 HVAC ContractorControls, Electrical and SafetyMedium
A technician must perform diagnostic work on an energized 480-volt panel where de-energization is not feasible due to critical operations. Per Cal/OSHA electrical safety requirements, what must be used to protect the technician?
- AAppropriate arc-rated PPE and insulated tools rated for the voltage and incident energy level
- BA second technician standing by with a fire extinguisher
- CA rubber floor mat with no other protective equipment
- DStandard leather work gloves and safety glasses only
Show answer & explanationAnswer & explanation
Correct answer: A. Appropriate arc-rated PPE and insulated tools rated for the voltage and incident energy level
Cal/OSHA requires that when work on energized equipment cannot be avoided, technicians must use arc-rated PPE and insulated tools rated for the specific voltage and calculated incident energy exposure, following an established energized work permit process. Leather gloves alone, a mat by itself, or a bystander with an extinguisher do not meet the required protective standard for live electrical work.
Why the other options are wrong
- B. A standby person with an extinguisher doesn't prevent electrical injury.
- C. A floor mat alone doesn't protect against arc flash or direct contact.
- D. Standard gloves and glasses provide no arc-flash or shock protection.
Energized Work PPE
Cal/OSHA requires arc-rated PPE and insulated tools rated for the specific voltage and incident energy when work on energized equipment cannot be de-energized.
- Energized work requires a documented justification/permit
- PPE rating must match calculated incident energy
- Insulated tools prevent direct contact shock
- De-energization is always preferred when feasible
Memory trick: Can't kill the power? Suit up in arc-rated armor.