Exam (elaborations)
ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO-28)
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ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO-28)
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ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO-28)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.
How often is a bonding resistance test required on an LPS? - answer- Every 24 months
What is the maximum allowable reading for a bonding resistance test on an LPS
conductor? - answer- 1 ohm or less
When conducting a bonding resistance test on an integral LPS with 10 air terminals and
two down conductors, how many individual resistance tests are required, at a minimum?
- answer- 20
While conducting a bonding resistance test on the integral LPS below, you placed test
leads on ground rod S and air terminal N. Which three bonds listed below are NOT
being tested? - answer- B
H
P
What information should be in a destructive weather plan? Select all that apply. -
answer- Which operations to shut down
Who is responsible for shutting down each operation
Steps for shutting down each operation
Instructions for evacuating personnel
Instructions for restarting each operation
Spheric - answer- Detects lightning strike
Alerts when lightning is nearby
Pre-strike - answer- Measure the strength of atmospheric electric fields
Alerts when lightning strikes are imminent
What is the primary danger in a hazardous classified location? - answer- Explosive
atmosphere
Which division describes a hazardous classified location with greatest probability of
ignition or explosion? - answer- Division 1
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