Electrical Safety Fundamentals
Electrical hazard is defined as a dangerous condition such that this can result in electric shock, arc flash burn, thermal burn, or arc blast injury.
What is contact or equipment failure?
Section that addresses workplaces covered and not covered.
What is 90.3?
Arc-rated clothing is required above this incident energy level.
What is 1.2 cal/cm²?
Proper OCPD selection and coordination affects incident energy by doing this.
What is reducing incident energy during faults?
The Occupational Safety and Health Act promises safe and this type of working conditions.
What is healthful?
Current through the body causing muscles to contract is an example of this element of risk.
What is severity?
Only these persons may work on energized conductors not placed in an electrically safe work condition.
Who are qualified persons?
Arc Flash PPE Category 2 requires clothing with at least this arc rating.
What is 8 cal/cm²?
The arcing current is this compared to bolted fault current.
What is less than?
OSHA 1926.21(b)(2) is found in this Subpart.
What is Subpart C?
Which parameter does NOT affect the severity of current passing through the human body?
What is an outdoors application?
The electric shock risk assessment results must be this.
What is documented?
An incident energy calculation of 8.3 cal/cm² determines this regarding PPE Categories.
What is PPE Category cannot be determined?
The trip unit setting that changes clearing time on its portion of the trip curve.
What is short-time delay setting?
Control circuit devices such as push buttons and selector switches may not be used as this.
What is the sole means for de-energizing equipment?
Lockout/tagout primarily reduces this aspect of an arc flash event.
What is easily establish an electrically safe work condition?
The lockout/tagout program must be audited at least this often.
What is every 1 year?
The lowest PPE category possible when working downstream of a circuit breaker in switchgear.
What is Category 4?
Typical instantaneous clearing time of a molded-case circuit breaker below 1000V.
What is 1.5 cycles?
Flexible cords and cables must not have these conditions.
What are worn, frayed, or damaged areas?
Lockout/tagout primarily reduces this aspect of an arc flash event.
What is the likelihood of an arc flash event?
Unqualified persons may cross the restricted approach boundary under this circumstance.
What is no circumstance?
This bus configuration produces the highest incident energy.
What is HCB?
This characteristic—not breaker type—best reduces incident energy.
What is an overcurrent protective device set or designed to respond quickly to arcing current?
Regular electrical maintenance helps ensure compliance by doing this.
What is identifying and correcting safety hazards or violations?