South Carolina Lightning Protection Exam 2026/2027 |
Complete Practice Test, Correct Answers & Detailed
Explanations | SCLP
Questions 1–168: NFPA 780 / Lightning Protection Systems
1. What is the primary purpose of a lightning protection system?
A. To prevent all lightning strikes
B. To provide a controlled path for lightning current to ground
C. To increase electrical resistance of a building
D. To eliminate atmospheric electricity
Correct Answer: B. To provide a controlled path for lightning current to
ground
Explanation: A lightning protection system provides a deliberate, low-
impedance path for lightning current so it can be conducted safely to
earth.
2. Which standard is primarily associated with installation of lightning
protection systems?
A. NFPA 70
B. NFPA 72
C. NFPA 780
D. NFPA 101
Correct Answer: C. NFPA 780
Explanation: NFPA 780 provides requirements for the installation of
lightning protection systems and related protection methods.
,3. Which component is commonly installed to intercept a lightning
discharge?
A. Air terminal
B. Ground rod only
C. Circuit breaker
D. Transformer
Correct Answer: A. Air terminal
Explanation: Air terminals, also called strike termination devices,
provide designated points for lightning attachment.
4. What is another common name for an air terminal?
A. Ground clamp
B. Lightning rod
C. Bonding jumper
D. Grounding electrode conductor
Correct Answer: B. Lightning rod
Explanation: “Lightning rod” is a common field term for an air terminal
used in lightning protection.
5. What is the principal function of a down conductor?
A. Increase voltage
B. Carry lightning current from the roof system toward earth
C. Disconnect utility power
D. Detect smoke
Correct Answer: B. Carry lightning current from the roof system
toward earth
Explanation: Down conductors connect the strike termination network
to the grounding electrode system.
,6. A lightning protection grounding system should provide which
characteristic?
A. High impedance
B. Low impedance
C. No electrical continuity
D. Maximum inductance
Correct Answer: B. Low impedance
Explanation: Lightning contains rapidly changing currents, making a
low-impedance path especially important.
7. Why should sharp bends generally be avoided in lightning
conductors?
A. They increase conductor color
B. They can increase impedance and encourage sideflash
C. They reduce conductor weight
D. They prevent corrosion completely
Correct Answer: B. They can increase impedance and encourage
sideflash
Explanation: Abrupt bends oppose rapid lightning-current flow and can
increase inductive effects and voltage differences.
8. What is the main purpose of bonding metal bodies near a lightning
conductor?
A. To increase voltage differences
B. To reduce dangerous potential differences
C. To insulate the metal
D. To increase static charge
, Correct Answer: B. To reduce dangerous potential differences
Explanation: Bonding helps keep nearby conductive objects at similar
electrical potential and reduces sideflash risk.
9. Sideflash is best described as:
A. Lightning leaving the atmosphere
B. A spark jumping between nearby conductive objects
C. A conductor melting underground
D. A circuit breaker opening
Correct Answer: B. A spark jumping between nearby conductive
objects
Explanation: Sideflash can occur when lightning current creates a
sufficient voltage difference between the protection conductor and
nearby metal.
10. What does equipotential bonding attempt to accomplish?
A. Create different voltages between metal objects
B. Place conductive objects at substantially similar electrical potential
C. Eliminate all grounding electrodes
D. Increase lightning current
Correct Answer: B. Place conductive objects at substantially similar
electrical potential
Explanation: Equipotential bonding reduces voltage differences that
could produce dangerous arcs.
11. Which material is commonly used for lightning protection
conductors?
A. Copper
B. Paper
Complete Practice Test, Correct Answers & Detailed
Explanations | SCLP
Questions 1–168: NFPA 780 / Lightning Protection Systems
1. What is the primary purpose of a lightning protection system?
A. To prevent all lightning strikes
B. To provide a controlled path for lightning current to ground
C. To increase electrical resistance of a building
D. To eliminate atmospheric electricity
Correct Answer: B. To provide a controlled path for lightning current to
ground
Explanation: A lightning protection system provides a deliberate, low-
impedance path for lightning current so it can be conducted safely to
earth.
2. Which standard is primarily associated with installation of lightning
protection systems?
A. NFPA 70
B. NFPA 72
C. NFPA 780
D. NFPA 101
Correct Answer: C. NFPA 780
Explanation: NFPA 780 provides requirements for the installation of
lightning protection systems and related protection methods.
,3. Which component is commonly installed to intercept a lightning
discharge?
A. Air terminal
B. Ground rod only
C. Circuit breaker
D. Transformer
Correct Answer: A. Air terminal
Explanation: Air terminals, also called strike termination devices,
provide designated points for lightning attachment.
4. What is another common name for an air terminal?
A. Ground clamp
B. Lightning rod
C. Bonding jumper
D. Grounding electrode conductor
Correct Answer: B. Lightning rod
Explanation: “Lightning rod” is a common field term for an air terminal
used in lightning protection.
5. What is the principal function of a down conductor?
A. Increase voltage
B. Carry lightning current from the roof system toward earth
C. Disconnect utility power
D. Detect smoke
Correct Answer: B. Carry lightning current from the roof system
toward earth
Explanation: Down conductors connect the strike termination network
to the grounding electrode system.
,6. A lightning protection grounding system should provide which
characteristic?
A. High impedance
B. Low impedance
C. No electrical continuity
D. Maximum inductance
Correct Answer: B. Low impedance
Explanation: Lightning contains rapidly changing currents, making a
low-impedance path especially important.
7. Why should sharp bends generally be avoided in lightning
conductors?
A. They increase conductor color
B. They can increase impedance and encourage sideflash
C. They reduce conductor weight
D. They prevent corrosion completely
Correct Answer: B. They can increase impedance and encourage
sideflash
Explanation: Abrupt bends oppose rapid lightning-current flow and can
increase inductive effects and voltage differences.
8. What is the main purpose of bonding metal bodies near a lightning
conductor?
A. To increase voltage differences
B. To reduce dangerous potential differences
C. To insulate the metal
D. To increase static charge
, Correct Answer: B. To reduce dangerous potential differences
Explanation: Bonding helps keep nearby conductive objects at similar
electrical potential and reduces sideflash risk.
9. Sideflash is best described as:
A. Lightning leaving the atmosphere
B. A spark jumping between nearby conductive objects
C. A conductor melting underground
D. A circuit breaker opening
Correct Answer: B. A spark jumping between nearby conductive
objects
Explanation: Sideflash can occur when lightning current creates a
sufficient voltage difference between the protection conductor and
nearby metal.
10. What does equipotential bonding attempt to accomplish?
A. Create different voltages between metal objects
B. Place conductive objects at substantially similar electrical potential
C. Eliminate all grounding electrodes
D. Increase lightning current
Correct Answer: B. Place conductive objects at substantially similar
electrical potential
Explanation: Equipotential bonding reduces voltage differences that
could produce dangerous arcs.
11. Which material is commonly used for lightning protection
conductors?
A. Copper
B. Paper
