Master Electrician 2 Exam Questions & Answers 2026 (11–20)

Question 1

In NEC text, the word 'shall' indicates:

TheoryPractice · Accepted Answer

A mandatory requirement. Per NEC 90.5, 'shall' denotes a mandatory requirement. 'Shall not' is a mandatory prohibition. 'Should' indicates a recommendation, and 'shall be permitted' indicates a permissive rule.

Question 2

The phrase 'shall be permitted' in NEC text signifies:

TheoryPractice · Accepted Answer

A permissive allowance. NEC 90.5(B) defines 'shall be permitted' as identifying options or alternative methods. It is not a mandate but a statement that the Code allows the described practice.

Question 3

OSHA's general-industry electrical standard is contained primarily in which part of 29 CFR 1910?

TheoryPractice · Accepted Answer

Subpart S (1910.301–1910.399). OSHA 29 CFR 1910 Subpart S covers electrical safety in general industry workplaces. It addresses design safety standards and safety-related work practices.

Question 4

OSHA 29 CFR 1910.333 establishes the lockout/tagout requirements for energized electrical equipment. Which of the following is NOT a required element of a proper lockout procedure under this standard?

TheoryPractice · Accepted Answer

Permanently remove the energy-isolating device after work. OSHA 1910.333 and the broader LOTO standard (1910.147) require notifying employees, shutting down equipment, and releasing stored energy — but the energy-isolating device (lockout lock) must remain in place until work is complete, not be permanently removed.

Question 5

Under OSHA's LOTO standard (29 CFR 1910.147), when may a tagout device be used in place of a lockout device?

TheoryPractice · Accepted Answer

Only when the energy-isolating device is not capable of being locked out. OSHA 1910.147(c)(3) allows tagout only when the energy-isolating device cannot physically accommodate a lock. Otherwise, lockout is required because tags alone can be removed or ignored.

Question 6

A master electrician is performing maintenance on a 480 V three-phase panel. After locking out and tagging out, the next step per OSHA LOTO protocol before touching conductors is:

TheoryPractice · Accepted Answer

Test with a voltage meter to verify the circuit is de-energized. After LOTO is applied, OSHA requires verification that the equipment is de-energized — typically by attempting to start the equipment and/or using a calibrated test instrument. 'Try-before-touch' prevents contact with unexpectedly live conductors.

Question 7

NFPA 70E establishes the requirement for an arc-flash risk assessment before workers approach energized equipment. Who is responsible for determining the arc-flash boundary and incident energy level?

TheoryPractice · Accepted Answer

The employer, through a qualified person. NFPA 70E 130.5 requires the employer to ensure an arc-flash risk assessment is performed by a qualified person. The assessment determines incident energy and the required PPE category.

Question 8

According to NFPA 70E, what is the Restricted Approach Boundary for unqualified workers around exposed energized conductors at 480 V phase-to-phase?

TheoryPractice · Accepted Answer

Unqualified workers shall not cross this boundary without being continuously escorted by a qualified person. NFPA 70E 130.4 establishes the Restricted Approach Boundary. Unqualified workers cannot enter this boundary unless continuously escorted and protected by a qualified person. All voltages above 50 V require boundary assessment.

Question 9

Per NFPA 70E Table 130.5(C), which PPE category is typically required when working inside the arc-flash boundary of a 480 V switchboard with doors open and bolted bus exposed, with incident energy estimated at 8 cal/cm²?

TheoryPractice · Accepted Answer

PPE Category 2 (minimum 8 cal/cm²). NFPA 70E PPE Category 2 requires arc-rated clothing and equipment with a minimum 8 cal/cm² arc rating. An estimated 8 cal/cm² incident energy falls within the Category 2 threshold.

Question 10

NEC 110.26 requires minimum working space depth in front of electrical panels operating at 120/240 V (Condition 1). What is that minimum depth?

TheoryPractice · Accepted Answer

36 inches. NEC Table 110.26(A)(1) requires a minimum of 36 inches of working space depth (front to back) for equipment operating up to 150 V to ground under Condition 1. This space must remain clear at all times.

Master Electrician 2 Exam Questions & Answers 2026 (11–20)

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