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.
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