Army Electrical Explosives Safety (Ammo-28) Exam Questions with Complete Solutions

Army Electrical Explosives Safety (Ammo-28) Exam Questions with Complete Solutions 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