US ARMY EXPLOSIVES SAFETY COMPREHENSIVE EXAM
2025 QUESTIONS WITH ANSWERS GUARANTEE A+
✔✔Which three are requirements for conductors? - ✔✔1. They interconnect all air
terminals
2. They may have only one rising path under 50 feet on a pitched roof.
3. They may have only one rising path at less than 1/4 slope on a gently sloping roof.
✔✔What is the maximum length a cross-run without connection to the roof conductor? -
✔✔150 feet
✔✔If you were inspecting this mast, would you report a defect? - ✔✔Yes, the down
conductors are supposed to be protected.
✔✔What is the preferred method of connection conductors? - ✔✔Exothermic weld
✔✔Which two statements about bonding are true? - ✔✔1. Bounding electrically
connects a metal object to an LPS.
2. Bounding reduces the risk sideflash.
✔✔Which bonding method is the most secure? - ✔✔Welding
✔✔Which condition is most common for AE facilities? - ✔✔Condition 2a
✔✔Which object is always required to be bonded? - ✔✔A railroad track 4 feet from an
LPS conductor
✔✔What condition applies to a 2-foot-long grounded metal object on a 15-foot-tall
structure? - ✔✔Condition 2a
✔✔Basic Bonding Formula - ✔✔D= Calculated bounding distance
H= Height of the structure or the proposed bond
Km= Value related to the flashover medium (air or solid material)
N= Value related to the number of down conductors
✔✔A grounded metal object has been added to a structure 25 feet tall. What is the
bonding distance and is bonding required? - ✔✔The bonding distance is 1 foot, and the
object does not need to be bonded.
✔✔A grounded metal object has been added to a structure 90 feet tall, as shown in the
image. What is the bounding distance and is bounding required? - ✔✔The bounding
distance is 3 inches, and the object does not need to be bonded.
, ✔✔The calculated bounding distance for this object is 2 feet 6 inches. Does the window
require bounding? - ✔✔No, because A+B is less than the bounding distance.
✔✔Which two earth electrode systems are Army-approved for use in new and
renovated structures? - ✔✔1. Ground loop
2. Ground rods
✔✔How do you determine the spacing requirement when using multiple ground rods? -
✔✔Add the driven depths of both rods.
✔✔Which four methods can be use to connect a down conductor to a ground rod? -
✔✔1. Brazing
2. Bolting
3. High-compression crimping
4. Exothermic welding
✔✔What is the minimum distance between ground rods and the structure foundation? -
✔✔3 feet
✔✔How long should test records be kept? - ✔✔6 inspection cycles
✔✔How often must lightning protection systems undergo visual inspection? - ✔✔Every
12 months
✔✔How often must conductive floors undergo visual inspection? - ✔✔Every 6 months
✔✔Which of the three following are deficiencies during an LPS visual inspection? -
✔✔1. Painted bond between air terminal and conductor
2. Broken bonding strap
3. Corroded conductor
✔✔A 3-point-fall-of-potential test must be conducted every - ✔✔2 years
✔✔The maximum resistance allowed for a 3-point fall-of-potential test is less than -
✔✔25 ohms
✔✔Conductive floors in explosives facilities must be tested every - ✔✔2 years
✔✔A conductive floor was tested at five locations. The average resistance of the
electrode-to-electrode test was 55,871 ohms. The lowest reading was 12,733 ohms.
The highest reading was 1,020,444 ohms. Does this test pass for electrode-to-electrode
resistance? - ✔✔Yes, because the average must be between 25,000 and 1,000,00
ohms with no result under 10,000 ohms or over 5,000,000 ohms.
2025 QUESTIONS WITH ANSWERS GUARANTEE A+
✔✔Which three are requirements for conductors? - ✔✔1. They interconnect all air
terminals
2. They may have only one rising path under 50 feet on a pitched roof.
3. They may have only one rising path at less than 1/4 slope on a gently sloping roof.
✔✔What is the maximum length a cross-run without connection to the roof conductor? -
✔✔150 feet
✔✔If you were inspecting this mast, would you report a defect? - ✔✔Yes, the down
conductors are supposed to be protected.
✔✔What is the preferred method of connection conductors? - ✔✔Exothermic weld
✔✔Which two statements about bonding are true? - ✔✔1. Bounding electrically
connects a metal object to an LPS.
2. Bounding reduces the risk sideflash.
✔✔Which bonding method is the most secure? - ✔✔Welding
✔✔Which condition is most common for AE facilities? - ✔✔Condition 2a
✔✔Which object is always required to be bonded? - ✔✔A railroad track 4 feet from an
LPS conductor
✔✔What condition applies to a 2-foot-long grounded metal object on a 15-foot-tall
structure? - ✔✔Condition 2a
✔✔Basic Bonding Formula - ✔✔D= Calculated bounding distance
H= Height of the structure or the proposed bond
Km= Value related to the flashover medium (air or solid material)
N= Value related to the number of down conductors
✔✔A grounded metal object has been added to a structure 25 feet tall. What is the
bonding distance and is bonding required? - ✔✔The bonding distance is 1 foot, and the
object does not need to be bonded.
✔✔A grounded metal object has been added to a structure 90 feet tall, as shown in the
image. What is the bounding distance and is bounding required? - ✔✔The bounding
distance is 3 inches, and the object does not need to be bonded.
, ✔✔The calculated bounding distance for this object is 2 feet 6 inches. Does the window
require bounding? - ✔✔No, because A+B is less than the bounding distance.
✔✔Which two earth electrode systems are Army-approved for use in new and
renovated structures? - ✔✔1. Ground loop
2. Ground rods
✔✔How do you determine the spacing requirement when using multiple ground rods? -
✔✔Add the driven depths of both rods.
✔✔Which four methods can be use to connect a down conductor to a ground rod? -
✔✔1. Brazing
2. Bolting
3. High-compression crimping
4. Exothermic welding
✔✔What is the minimum distance between ground rods and the structure foundation? -
✔✔3 feet
✔✔How long should test records be kept? - ✔✔6 inspection cycles
✔✔How often must lightning protection systems undergo visual inspection? - ✔✔Every
12 months
✔✔How often must conductive floors undergo visual inspection? - ✔✔Every 6 months
✔✔Which of the three following are deficiencies during an LPS visual inspection? -
✔✔1. Painted bond between air terminal and conductor
2. Broken bonding strap
3. Corroded conductor
✔✔A 3-point-fall-of-potential test must be conducted every - ✔✔2 years
✔✔The maximum resistance allowed for a 3-point fall-of-potential test is less than -
✔✔25 ohms
✔✔Conductive floors in explosives facilities must be tested every - ✔✔2 years
✔✔A conductive floor was tested at five locations. The average resistance of the
electrode-to-electrode test was 55,871 ohms. The lowest reading was 12,733 ohms.
The highest reading was 1,020,444 ohms. Does this test pass for electrode-to-electrode
resistance? - ✔✔Yes, because the average must be between 25,000 and 1,000,00
ohms with no result under 10,000 ohms or over 5,000,000 ohms.
