Army Electrical Explosives
Safety (Ammo-28) Exam with
complete solution 2023-2024
Which two publications provide detailed information on lightning protection systems? - AnswersDA
PAM 385-64
NFPA 780
Which statements about lightning protection are true?Select all that apply. - AnswersLightning can
detonate munitions and explosives.
Lightning seeks the path of least resistance to ground.
Lightning cannot be stopped or prevented.
Which statement is true about a mast LPS? - AnswersEach mast must have two paths to ground.
A 30-foot tall building is protected by a catenary system. How far from the building should the masts
be placed? - Answersat least 6 feet
Which LPS uses air terminals and conductors mounted directly to the structure? - AnswersIntegral
Why does the wooden mast have an air terminal on top and two down conductors running its entire
length? - AnswersThe wooden mast is not electrically conductive
, Which of the following is NOT a requirement for air terminals? - AnswersAir Terminals must be at
least 6 feet tall.
During the inspection, John's team logged a discrepancy for this air terminal. Why? - AnswersThe air
terminal is not attached to a conductor.
How many down conductors are required for a building with a perimeter length of 325 feet? -
Answers4
While conducting an LPS inspection, you see mast down conductors routed as shown in the image
below. Do you write it up as a discrepancy? Why or why not? - AnswersYes, because mast down
conductors should be 180 degrees apart.
A steel beam, connected to the main LPS at its upper and lower extremities, is used as a down
conductor. At what intervals should it be connected to the grounding system? - Answers60 feet or
less
Which statement about grounding systems is true? - AnswersThe resistance should be 25 ohms or
less.
Which of the following statements regarding bonding are true? Select all that apply. -
AnswersBonding reduces the threat of sideflash by providing a low impedance path to ground.
Bonding is a way of connecting LPS conductors to grounded metal objects.
When should a grounded metal object be considered for bonding? - AnswersWhen it's within 6 feet
of a conductor
Which bonding method is the most permanent and secure? - AnswersExothermic weld
Which factors are used to calculate bonding distance?Select all that apply. - AnswersHeight of
proposed bond
Flashover medium
Safety (Ammo-28) Exam with
complete solution 2023-2024
Which two publications provide detailed information on lightning protection systems? - AnswersDA
PAM 385-64
NFPA 780
Which statements about lightning protection are true?Select all that apply. - AnswersLightning can
detonate munitions and explosives.
Lightning seeks the path of least resistance to ground.
Lightning cannot be stopped or prevented.
Which statement is true about a mast LPS? - AnswersEach mast must have two paths to ground.
A 30-foot tall building is protected by a catenary system. How far from the building should the masts
be placed? - Answersat least 6 feet
Which LPS uses air terminals and conductors mounted directly to the structure? - AnswersIntegral
Why does the wooden mast have an air terminal on top and two down conductors running its entire
length? - AnswersThe wooden mast is not electrically conductive
, Which of the following is NOT a requirement for air terminals? - AnswersAir Terminals must be at
least 6 feet tall.
During the inspection, John's team logged a discrepancy for this air terminal. Why? - AnswersThe air
terminal is not attached to a conductor.
How many down conductors are required for a building with a perimeter length of 325 feet? -
Answers4
While conducting an LPS inspection, you see mast down conductors routed as shown in the image
below. Do you write it up as a discrepancy? Why or why not? - AnswersYes, because mast down
conductors should be 180 degrees apart.
A steel beam, connected to the main LPS at its upper and lower extremities, is used as a down
conductor. At what intervals should it be connected to the grounding system? - Answers60 feet or
less
Which statement about grounding systems is true? - AnswersThe resistance should be 25 ohms or
less.
Which of the following statements regarding bonding are true? Select all that apply. -
AnswersBonding reduces the threat of sideflash by providing a low impedance path to ground.
Bonding is a way of connecting LPS conductors to grounded metal objects.
When should a grounded metal object be considered for bonding? - AnswersWhen it's within 6 feet
of a conductor
Which bonding method is the most permanent and secure? - AnswersExothermic weld
Which factors are used to calculate bonding distance?Select all that apply. - AnswersHeight of
proposed bond
Flashover medium
