Ammo-28-DL Electrical Explosives
Safety for Army Facilities, Ammo-47-DL
Lightning Protection for Air Force
Facilities
Which statement regarding lightning protection is false? ANS - lightning protection system prevents
lightning strikes from occurring.
How many down conductors are required for a mast LPS? ANS - 2
Which material is preferred for ground conductors? ANS - Copper
What does n represent in the Basic Bonding Formula? ANS - Number of down conductors
What does Km represent in the Basic Bonding Formula? ANS - flashover medium
During an LPS inspection you notice a grounded metal pipe 3 feet from a conductor. Should you write it
up as a possible discrepancy? ANS - Yes. Grounded metal objects within 6 feet of a conductor should be
considered for bonding
What does D represent in the Basic Bonding Formula? ANS - Bonding distance
Which bonding condition applies to isolated metal objects surrounded by non-conductive material (such
as a metal door frame in a concrete wall)? ANS - WRONG Condition 2
Calculate the BBF to determine if bonding is required for the scenario below. Use a calculator, the BBF
equation aid, and the bonding job aid as required.
• The metal vent is 15 feet high.
• There are 2 down conductors at the proper spacing.
, • The vent is 12 inches (1 foot) from a conductor through air. ANS - Bonding distance for the metal roof
vent is 1 foot 8 inches. Bonding is required.
LPS test results must be kept on file for ANS - 6 inspection cycles
An LPS visual inspection is required every ANS - 12 months
Conductive floors in explosives facilities must be tested every ANS - WRONG 6 months
At a minimum, how many individual resistance tests must be performed on this conductive floor? Refer
to DA PAM 385-64, Section C-3 as required. ANS - Ten tests: five electrode-to-electrode and five
electrode-to-ground tests
An LPS requires three-point fall-of-potential earth resistance testing every ANS - Every 24 months
When conducting a 3-point fall-of-potential earth resistance test, what is the maximum allowable
resistance reading? ANS - 25 ohms
When conducting a bonding resistance test, what is the maximum allowable reading? ANS - 1 ohm
How many individual bonding resistance tests are required on an integral LPS with 12 air terminals and 2
down conductors? ANS - 24
Which storm warning system measures the strength of atmospheric electric fields and warns of the
possibility of lightning strikes? ANS - Pre-strike
Which hazardous classified location division poses the least probability of ignition or explosion? ANS -
Division 2
Which material belongs to hazardous classified location Class II? ANS - coal dust
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