E2 Safety Standards and Practices 2

Question 1

What is the minimum approach distance for qualified workers near energized 480V conductors without PPE barriers?

Accepted Answer

Restricted approach boundary

Answer

Limited approach boundary

Answer

Prohibited approach boundary

Answer

Arc flash boundary

Question 2

Under OSHA 29 CFR 1910.333, de-energized electrical equipment must be locked out before work begins unless the employer can demonstrate that de-energizing would:

Accepted Answer

Cause a greater hazard or is infeasible due to equipment design

Answer

Save less than 30 minutes of downtime

Answer

Require more than two workers to accomplish

Answer

Require special tools not on site

Question 3

Which NFPA 70E hazard/risk category requires an arc flash suit with a minimum arc rating of 40 cal/cm²?

Accepted Answer

Category 4

Answer

Category 3

Answer

Category 1

Answer

Category 2

Question 4

When inspecting a commercial switchboard, an inspector notices an arc flash label that is over 5 years old. According to NFPA 70E, this label should be:

Accepted Answer

Updated through a new arc flash hazard analysis

Answer

Replaced with a generic 4 cal/cm² label

Answer

Covered with a warning sticker only

Answer

Left in place if no equipment changes occurred

Question 5

A commercial building's electrical panel room has a working space depth of 2.5 feet in front of a 480V switchboard. According to NEC 110.26, this is:

Accepted Answer

A violation; minimum depth is 3 feet for voltages 151–600V

Answer

Compliant for any voltage up to 600V

Answer

Compliant only if rear access is available

Answer

A violation; minimum depth is 4 feet for voltages above 240V

Question 6

An E2 inspector observes that a 277V fluorescent lighting circuit has no GFCI protection in a commercial kitchen wet location. Which code section applies?

Accepted Answer

NEC 210.8(B) requires GFCI for 277V circuits in commercial wet locations

Answer

NEC 210.8(B) only covers 120V receptacles in commercial kitchens

Answer

NEC 215.9 mandates AFCI for all lighting circuits

Answer

NEC 230.95 requires GFPE for services over 150V

Question 7

During a commercial inspection, an inspector finds that a contractor used aluminum conductors for branch circuits in a multi-family dwelling. What is the primary safety concern?

Accepted Answer

Aluminum can cause loose connections leading to overheating at terminals rated for copper only

Answer

Aluminum has lower resistance than copper causing nuisance tripping

Answer

Aluminum conductors are prohibited for any use above 120V

Answer

Aluminum is only prohibited in wet locations