ARMY ELECTRICAL EXPLOSIVES SAFETY s

Which two publications provide detailed information on lightning protection systems? - CORRECT ANSWER-DA PAM 385-64 NFPA 780 Which statements about lightning protection are true?Select all that apply. - CORRECT 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? - CORRECT 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? - CORRECT ANSWER-at least 6 feet Which LPS uses air terminals and conductors mounted directly to the structure? - CORRECT ANSWER-Integral Why does the wooden mast have an air terminal on top and two down conductors running its entire length? - CORRECT ANSWER-The wooden mast is not electrically conductive Which of the following is NOT a requirement for air terminals? - CORRECT ANSWER-Air Terminals must be at least 6 feet tall. During the inspection, John's team logged a discrepancy for this air terminal. Why? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER-60 feet or less Which statement about grounding systems is true? - CORRECT ANSWER-The resistance should be 25 ohms or less