Army Electrical Explosives Safety (Ammo-28) Exam

Which two publications provide detailed information on lightning protection systems? - Answer- DA PAM 385-64 NFPA 780 Which statements about lightning protection are true?Select all that apply. - Answer- Lightning 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? - Answer- Each 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? - Answer- at least 6 feet Which LPS uses air terminals and conductors mounted directly to the structure? - Answer- Integral Why does the wooden mast have an air terminal on top and two down conductors running its entire length? - Answer- The wooden mast is not electrically conductive Which of the following is NOT a requirement for air terminals? - Answer- Air Terminals must be at least 6 feet tall. During the inspection, John's team logged a discrepancy for this air terminal. Why? - Answer- The air terminal is not attached to a conductor. How many down conductors are required for a building with a perimeter length of 325 feet? - Answer- 4 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? - Answer- Yes, 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? - Answer- 60 feet or less Which statement about grounding systems is true? - Answer- The resistance should be 25 ohms or less. Which of the following statements regarding bonding are true? Select all that apply. - Answer- Bonding 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? - Answer- When it's within 6 feet of a conductor Which bonding method is the most permanent and secure? - Answer- Exothermic weld Which factors are used to calculate bonding distance?Select all that apply. - Answer- Height of proposed bond Flashover medium Number of down conductors While conducting the inspection, John's team noticed a new metal light pole installed 3 feet from the down conductor at the corner of this building. They logged a discrepancy. Why? - Answer- Because grounded metal objects within 6 feet of LPS conductors should be bonded to it Which types of information does an LPS record provide? Select all that apply. - Answer- Test locations Test item descriptions or listing Type of test Responsibilities for conducting and administering the test plan Which section of DA PAM 385-64 provides LPS visual inspection guidance? - Answer- Appendix D How often is a visual inspection required on an LPS? - Answer- Every 12 months While conducting the LPS inspection, the team saw these surveillance cameras. Does this building comply with LPS standards? - Answer- No, because the surveillance cameras are outside the zone of protection. How long must LPS test results be kept on file? - Answer- 6 inspection cycles How often is a conductive floor electrical test