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Section 1: Safety & Regulatory Compliance (NFPA 70E 2024, OSHA) Questions 1 to 40
**Question 1**
According to NFPA 70E 2024, what is the minimum approach distance for a qualified person
exposed to an arc flash hazard with an incident energy of 25 cal/cm²?
A) 12 inches
B) Based on the arc flash boundary calculation ✓
C) 3 feet always
D) 18 inches without PPE
**Correct Answer: B ✓**
Rationale: NFPA 70E 2024 emphasizes calculated arc flash boundaries based on incident
energy, not fixed distances. The arc flash boundary is the distance at which incident energy
equals 1.2 cal/cm². For 25 cal/cm², PPE with at least that rating is required, and approach
distance is determined by study, not a fixed number.
---
**Question 2**
A motor LOTO has 6 stored energy sources. After locking out the main disconnect, the
technician must:
A) Start the repair immediately to save time
B) Identify, isolate, and dissipate or restrain all stored energy sources (electrical, mechanical,
hydraulic, pneumatic, spring, gravity) before beginning work ✓
C) Only lock out the electrical source
,D) Remove locks from all sources
**Correct Answer: B ✓**
Rationale: OSHA and NFPA 70E require that all stored energy sources be identified and
controlled (dissipated, blocked, bled, or restrained) before work begins. Locking only the
electrical disconnect (C) is insufficient when mechanical, hydraulic, pneumatic, or gravitational
stored energy exists. Option A is unsafe. Option D is opposite of LOTO.
---
**Question 3**
What does the term "arc flash boundary" mean in NFPA 70E?
A) The distance from an arc source where the incident energy is 1.2 cal/cm² ✓
B) The distance from the equipment where no PPE is needed
C) The distance from the equipment to the wall
D) The safe distance for unqualified persons (typically 10 feet)
**Correct Answer: A ✓**
Rationale: The arc flash boundary is the distance from a potential arc source at which the
incident energy equals 1.2 cal/cm² (the onset of a second-degree burn). Unqualified persons
must remain outside this boundary unless properly protected. Option D describes limited
approach boundary for shock, not arc flash.
---
**Question 4**
According to OSHA, a "competent person" in safety is defined as someone who:
A) Has a college degree in safety
B) Is capable of identifying existing and predictable hazards and has authority to take prompt
corrective action ✓
, C) Has worked for at least 10 years
D) Is appointed by the union
**Correct Answer: B ✓**
Rationale: OSHA defines a competent person as one who can identify hazards and has the
authority to correct them. A degree (A) and years of experience (C) may contribute but are not
the definition. Option D is incorrect; authority comes from employer, not union.
---
**Question 5**
What is the maximum allowable voltage for a "low voltage" system according to NFPA 70E
(typical threshold for shock protection boundaries)?
A) 50 volts (or 60 volts DC depending on standard) – NFPA 70E defines 50 volts AC/60 volts DC
as the threshold for requiring shock protection. ✓
B) 120 volts
C) 240 volts
D) 480 volts
**Correct Answer: A ✓**
Rationale: NFPA 70E uses 50 volts AC and 60 volts DC as the threshold above which shock
protection boundaries (limited, restricted, prohibited approach) apply. Below this voltage, shock
protection is typically not required (but hazard still exists). Options B, C, D are above the
threshold.
---
**Question 6**
A qualified electrical worker must wear arc-rated clothing with a minimum arc rating of:
A) Whatever is comfortable
answers wIth ratIonales/graded a+/2026 update/100%
correct /Instant download
Section 1: Safety & Regulatory Compliance (NFPA 70E 2024, OSHA) Questions 1 to 40
**Question 1**
According to NFPA 70E 2024, what is the minimum approach distance for a qualified person
exposed to an arc flash hazard with an incident energy of 25 cal/cm²?
A) 12 inches
B) Based on the arc flash boundary calculation ✓
C) 3 feet always
D) 18 inches without PPE
**Correct Answer: B ✓**
Rationale: NFPA 70E 2024 emphasizes calculated arc flash boundaries based on incident
energy, not fixed distances. The arc flash boundary is the distance at which incident energy
equals 1.2 cal/cm². For 25 cal/cm², PPE with at least that rating is required, and approach
distance is determined by study, not a fixed number.
---
**Question 2**
A motor LOTO has 6 stored energy sources. After locking out the main disconnect, the
technician must:
A) Start the repair immediately to save time
B) Identify, isolate, and dissipate or restrain all stored energy sources (electrical, mechanical,
hydraulic, pneumatic, spring, gravity) before beginning work ✓
C) Only lock out the electrical source
,D) Remove locks from all sources
**Correct Answer: B ✓**
Rationale: OSHA and NFPA 70E require that all stored energy sources be identified and
controlled (dissipated, blocked, bled, or restrained) before work begins. Locking only the
electrical disconnect (C) is insufficient when mechanical, hydraulic, pneumatic, or gravitational
stored energy exists. Option A is unsafe. Option D is opposite of LOTO.
---
**Question 3**
What does the term "arc flash boundary" mean in NFPA 70E?
A) The distance from an arc source where the incident energy is 1.2 cal/cm² ✓
B) The distance from the equipment where no PPE is needed
C) The distance from the equipment to the wall
D) The safe distance for unqualified persons (typically 10 feet)
**Correct Answer: A ✓**
Rationale: The arc flash boundary is the distance from a potential arc source at which the
incident energy equals 1.2 cal/cm² (the onset of a second-degree burn). Unqualified persons
must remain outside this boundary unless properly protected. Option D describes limited
approach boundary for shock, not arc flash.
---
**Question 4**
According to OSHA, a "competent person" in safety is defined as someone who:
A) Has a college degree in safety
B) Is capable of identifying existing and predictable hazards and has authority to take prompt
corrective action ✓
, C) Has worked for at least 10 years
D) Is appointed by the union
**Correct Answer: B ✓**
Rationale: OSHA defines a competent person as one who can identify hazards and has the
authority to correct them. A degree (A) and years of experience (C) may contribute but are not
the definition. Option D is incorrect; authority comes from employer, not union.
---
**Question 5**
What is the maximum allowable voltage for a "low voltage" system according to NFPA 70E
(typical threshold for shock protection boundaries)?
A) 50 volts (or 60 volts DC depending on standard) – NFPA 70E defines 50 volts AC/60 volts DC
as the threshold for requiring shock protection. ✓
B) 120 volts
C) 240 volts
D) 480 volts
**Correct Answer: A ✓**
Rationale: NFPA 70E uses 50 volts AC and 60 volts DC as the threshold above which shock
protection boundaries (limited, restricted, prohibited approach) apply. Below this voltage, shock
protection is typically not required (but hazard still exists). Options B, C, D are above the
threshold.
---
**Question 6**
A qualified electrical worker must wear arc-rated clothing with a minimum arc rating of:
A) Whatever is comfortable
