CEA Safety Standards & Regulations 5

Question 1

A tagout device alone (without a lockout device) may be used when:

Accepted Answer

The employer can demonstrate that tagging provides the same protection as locking, and lockout is not feasible

Answer

OSHA 1910.147(c)(3) permits tagout-only when the employer proves full employee protection equivalent to lockout, since lockout is always preferred.

Question 2

Which NEC article governs the installation of wiring methods and materials in hazardous (classified) locations?

Accepted Answer

Articles 500–516

Answer

NEC Articles 500–516 cover electrical installations in hazardous classified locations where flammable gases, vapors, or dusts may be present.

Question 3

What does the 'incident energy' measurement in an arc flash hazard analysis represent?

Accepted Answer

The thermal energy released at a working distance during an arc flash event, measured in cal/cm²

Answer

Incident energy is the amount of thermal energy (cal/cm²) an arc flash releases at a specific working distance, used to select appropriate PPE.

Question 4

Under OSHA's Electrical Safety standard, who is responsible for ensuring workers have appropriate PPE for electrical work?

Accepted Answer

Both the employer and the employee share responsibility

Answer

OSHA places the primary duty on employers to provide appropriate PPE and training, while employees are responsible for using it correctly.

Question 5

What is the minimum insulation voltage rating required for rubber insulating gloves used when working on 480V circuits?

Accepted Answer

Class 0 (1,000V)

Answer

ASTM F496 Class 0 gloves are rated for use up to 1,000V AC max-use voltage, making them the minimum acceptable choice for 480V work.

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