ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO28)
EXAM 2025-2026 QUESTIONS AND ANSWERS
Which material is preferred for ground conductors? - ANSWER--Copper
What does n represent in the Basic Bonding Formula? - ANSWER--Number of down conductors
What does Km represent in the Basic Bonding Formula? - ANSWER--flashover medium
During an LPS inspection you notice a grounded metal pipe 3 feet from a conductor. Should you write it
up as a possible discrepancy? - ANSWER--Yes.
Grounded metal objects within 6 feet of a conductor should be considered for bonding
What does D represent in the Basic Bonding Formula? - ANSWER--Bonding distance
Which bonding condition applies to isolated metal objects surrounded by non- conductive material
(such as a metal door frame in a concrete wall)? - ANSWER-- WRONG Condition 2
Calculate the BBF to determine if bonding is required for the scenario below. Use a calculator, the BBF
equation aid, and the bonding job aid as required.
• The metal vent is 15 feet high.
• There are 2 down conductors at the proper spacing.
• The vent is 12 inches (1 foot) from a conductor through air. - ANSWER--Bonding distance for the
metal roof vent is 1 foot 8 inches. Bonding is required.
,LPS test results must be kept on file for - ANSWER--6 inspection cycles
An LPS visual inspection is required every - ANSWER--12 months
Conductive floors in explosives facilities must be tested every - ANSWER--WRONG 6 months
At a minimum, how many individual resistance tests must be performed on this conductive floor? Refer
to DA PAM 385-64, Section C-3 as required. - ANSWER-- Ten tests: five electrodeto-electrode and five
electrode-to-ground tests
An LPS requires three-point fall-of-potential earth resistance testing every - ANSWER--Every 24
months
When conducting a 3-point fall-of-potential earth resistance test, what is the maximum allowable
resistance reading? - ANSWER--25 ohms
When conducting a bonding resistance test, what is the maximum allowable reading? - ANSWER--1 ohm
How many individual bonding resistance tests are required on an integral LPS with 12 air terminals and 2
down conductors? - ANSWER--24
Which storm warning system measures the strength of atmospheric electric fields and warns of the
possibility of lightning strikes? - ANSWER--Pre-strike
, Which hazardous classified location division poses the least probability of ignition or explosion? -
ANSWER--Division 2
Which material belongs to hazardous classified location Class II? - ANSWER--coal dust
Which material belongs to hazardous classified location Class I? - ANSWER-- acetylene gas
Which HERO classification describes items that may explode or detonate if exposed to EMR? - ANSWER--
HERO UNSAFE
Which of the following is NOT a hazard posed by electromagnetic radiation? - ANSWER--
WRONG ignition of fuel and other combustibles
WRONG generation of extreme heat in the human body
For guidance on lightning protection requirements, you use AFI 32-1065 and - ANSWER--NFPA 780
You need to inspect an LPS that has vertical poles connected to overhead cables that stretch the length
of the structure. What type of LPS does this describe? - ANSWER--catenary
How many feet radius does the DoD require for an LPS zone of protection? - ANSWER--100ft
While conducting an LPS inspection, you discover the scenario illustrated in the image below. Do you
write it up as a discrepancy? - ANSWER--yes, because the air terminal is not attached to a conductor.
EXAM 2025-2026 QUESTIONS AND ANSWERS
Which material is preferred for ground conductors? - ANSWER--Copper
What does n represent in the Basic Bonding Formula? - ANSWER--Number of down conductors
What does Km represent in the Basic Bonding Formula? - ANSWER--flashover medium
During an LPS inspection you notice a grounded metal pipe 3 feet from a conductor. Should you write it
up as a possible discrepancy? - ANSWER--Yes.
Grounded metal objects within 6 feet of a conductor should be considered for bonding
What does D represent in the Basic Bonding Formula? - ANSWER--Bonding distance
Which bonding condition applies to isolated metal objects surrounded by non- conductive material
(such as a metal door frame in a concrete wall)? - ANSWER-- WRONG Condition 2
Calculate the BBF to determine if bonding is required for the scenario below. Use a calculator, the BBF
equation aid, and the bonding job aid as required.
• The metal vent is 15 feet high.
• There are 2 down conductors at the proper spacing.
• The vent is 12 inches (1 foot) from a conductor through air. - ANSWER--Bonding distance for the
metal roof vent is 1 foot 8 inches. Bonding is required.
,LPS test results must be kept on file for - ANSWER--6 inspection cycles
An LPS visual inspection is required every - ANSWER--12 months
Conductive floors in explosives facilities must be tested every - ANSWER--WRONG 6 months
At a minimum, how many individual resistance tests must be performed on this conductive floor? Refer
to DA PAM 385-64, Section C-3 as required. - ANSWER-- Ten tests: five electrodeto-electrode and five
electrode-to-ground tests
An LPS requires three-point fall-of-potential earth resistance testing every - ANSWER--Every 24
months
When conducting a 3-point fall-of-potential earth resistance test, what is the maximum allowable
resistance reading? - ANSWER--25 ohms
When conducting a bonding resistance test, what is the maximum allowable reading? - ANSWER--1 ohm
How many individual bonding resistance tests are required on an integral LPS with 12 air terminals and 2
down conductors? - ANSWER--24
Which storm warning system measures the strength of atmospheric electric fields and warns of the
possibility of lightning strikes? - ANSWER--Pre-strike
, Which hazardous classified location division poses the least probability of ignition or explosion? -
ANSWER--Division 2
Which material belongs to hazardous classified location Class II? - ANSWER--coal dust
Which material belongs to hazardous classified location Class I? - ANSWER-- acetylene gas
Which HERO classification describes items that may explode or detonate if exposed to EMR? - ANSWER--
HERO UNSAFE
Which of the following is NOT a hazard posed by electromagnetic radiation? - ANSWER--
WRONG ignition of fuel and other combustibles
WRONG generation of extreme heat in the human body
For guidance on lightning protection requirements, you use AFI 32-1065 and - ANSWER--NFPA 780
You need to inspect an LPS that has vertical poles connected to overhead cables that stretch the length
of the structure. What type of LPS does this describe? - ANSWER--catenary
How many feet radius does the DoD require for an LPS zone of protection? - ANSWER--100ft
While conducting an LPS inspection, you discover the scenario illustrated in the image below. Do you
write it up as a discrepancy? - ANSWER--yes, because the air terminal is not attached to a conductor.
