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Army Electrical Explosives Safety Course
(Ammo 28) Questions and Correct Answers
Which four statements are characteristics of lightening?
Ans: Lightening heats the air to 50,000F., Most lightening
never reaches the ground., Lightening carries about 30,000
amps of current., Lightening is about 1" thick.
Which of the following statements about lightening is
false? Ans: All lightening strikes the ground.
Place the steps of lightening formation in the correct order.
Ans: 1. Change forms in a cloud
2. A stepped leader extends down from the cloud.
3. An upward stream extends up from the ground.
4. The stepped leader and upward streamer connect and
current flows from the cloud to the ground.
The goal of lightening protection is to Ans: Provide a non-
destructive, low resistance path to the ground.
Select all the wats lightening can cause damage. Ans:
Spalling, Heat or fire, Electromagnetic radiation, Current
Which three regulatory publications are used for Army
explosives facilities? Ans: DESR 6055.09, DA PAM 385-64,
NFPA 780
If a paragraph in NFPA 780 is labeled with an asterisk,
where would you look to find additional explanatory
information? Ans: NFPA 780, Annex A
What is the primary principle of lightening protection?
Ans: To protect life and property by providing a non-
destructive, low resistance path to the ground
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Put the LPS components in the order in which the current
flows after a lightening strike. Ans: 1. Strike determination
device
2. Down conductor
3. Grounding system
Which image shows an example of an integral LPS? Ans:
The one on the building
Which image shows an example of a mast LPS? Ans: The
one that is just a pole
Which image shows an example of a catenary LPS? Ans:
The one that is a pole with wires
Select the LPS system(s) that require each feature. Ans:
Wooden or metal mast - Mast system, Catenary System
Air terminals mounted to the building - Catenary System,
Integral system
Strike termination device on mast - Mast system, catenary
system
Wire connecting masts - catenary system
Grounding system - mast system, catenary system, integral
system
Which LPS type is used to protect a large, open area? Ans:
Catenary system
What is the zone of protection? Ans: The area protected by
a lightening protection system (LPS)
According to the rolling sphere method, the building in the
image is within the zone of protection. Ans: True
© 2025 All rights reserved
Army Electrical Explosives Safety Course
(Ammo 28) Questions and Correct Answers
Which four statements are characteristics of lightening?
Ans: Lightening heats the air to 50,000F., Most lightening
never reaches the ground., Lightening carries about 30,000
amps of current., Lightening is about 1" thick.
Which of the following statements about lightening is
false? Ans: All lightening strikes the ground.
Place the steps of lightening formation in the correct order.
Ans: 1. Change forms in a cloud
2. A stepped leader extends down from the cloud.
3. An upward stream extends up from the ground.
4. The stepped leader and upward streamer connect and
current flows from the cloud to the ground.
The goal of lightening protection is to Ans: Provide a non-
destructive, low resistance path to the ground.
Select all the wats lightening can cause damage. Ans:
Spalling, Heat or fire, Electromagnetic radiation, Current
Which three regulatory publications are used for Army
explosives facilities? Ans: DESR 6055.09, DA PAM 385-64,
NFPA 780
If a paragraph in NFPA 780 is labeled with an asterisk,
where would you look to find additional explanatory
information? Ans: NFPA 780, Annex A
What is the primary principle of lightening protection?
Ans: To protect life and property by providing a non-
destructive, low resistance path to the ground
© 2025 All rights reserved
, 2 | Page
Put the LPS components in the order in which the current
flows after a lightening strike. Ans: 1. Strike determination
device
2. Down conductor
3. Grounding system
Which image shows an example of an integral LPS? Ans:
The one on the building
Which image shows an example of a mast LPS? Ans: The
one that is just a pole
Which image shows an example of a catenary LPS? Ans:
The one that is a pole with wires
Select the LPS system(s) that require each feature. Ans:
Wooden or metal mast - Mast system, Catenary System
Air terminals mounted to the building - Catenary System,
Integral system
Strike termination device on mast - Mast system, catenary
system
Wire connecting masts - catenary system
Grounding system - mast system, catenary system, integral
system
Which LPS type is used to protect a large, open area? Ans:
Catenary system
What is the zone of protection? Ans: The area protected by
a lightening protection system (LPS)
According to the rolling sphere method, the building in the
image is within the zone of protection. Ans: True
© 2025 All rights reserved
