Barriers Flashcards
What are the three K ratings?
Defined by the DOD.
K4-15,000 pound vehicle @ 30mph
K8-15,000 pound vehicle @ 40mph
K12-15,000 pound vehicle @ 50mph
What are Concertina Coils?
The coils of razar wire found on the top of fences.
What are the 3 levels of fence height and what are they good for?
5-6 ft (Low Security)
7 ft (Moderate Security)
18-20ft (High Security)
What are the 5 different window types?
1) Annealed or Plate Glass-regular glass (big shards)
2) Tempered Glass-treated and resistant to breakage, fragments into small pieces.
3) Wired Glass-resistance against large objects but may still shatter.
4) Laminated Glass-two panes of regular glass combined using a plastic material to minimize damage when broken
5) Bullet/Burglar resistant glass. Stronger Resistance to attack, is laminated, multiple panes/piles of glass, poly-carbonate, other plastic films provide many levels of ballistic resistance.
What are the nine different fence types?
1) High Strength Cable fence (used for vehicle control)
2) Electric Fence (Live wire deterrent or monitored fence, both shock, but second has alarm)
3) Razor wire (Barbed Tape) or Concertina Wire Fence (6 inches between wires)
4) Concrete Fence (Building blocks, easily scaled)
5) Decorative Fence (use when appearance is paramount)
6) Wooden Fence (For low security and can be augmented with barbed wire/concertina)
7) Expanded Metal Fencing (difficult to cut and much better than chain link)
8) Welded Wire Fence (cheaper than Expanded Metal Fencing but still better than chain link)
9) Chain link fencing
What is a Fencing Top Guard/Outrigger?
It is what holds the barbed wire on top of a fence. Should be positioned at 45 degrees, be one foot in height including the 3 strands.
What are the four considerations when installing chain link fencing? What are the 3 kinds of posts?
1) Do not exceed 10ft (3m) between posts
2) No more than 2 inches between any building and terminal post
3) Diameter of post holes should be 4 times larger than largest cross section.
4) Fence fabric over 12 feet high requires a central rail brace. Terminal Posts are placed at the end corners and to support gates. Pull Posts are terminal posts bracing a long section of of fence or for installed to accommodate elevation change. All other posts are line posts.
What does structural security comprise?
Barriers, protective lighting, locks, and structure and components of buildings and facilities.
What are the two types of barriers? What can they include?
1) Natural Barriers
2) Man-made Barriers (animals, humans, and dispensable barriers)
What are two types of plastic glazing?
1) Acrylic (Lucite and Plexiglas) Can be penetrated in less than 10 seconds (not typically recommended)
2) Polycarbonates: offer impact resistance, up to two minutes to thermal tools
What is the minimum size of opening that would need protection?
Anything greater than 96 square inches.
How far away can enhancements be when installed below the roofline?
No more than 10-12 inches
What are the three purposes of a fence?
Define an area
Delay an intruder
Direct people to desired checkpoints
Should all gates have locking devices?
Yes
What is the minimum thickness for a 4 hour Vault, 6 hour Vault for reinforced concrete?
4 hour = 12 inches
6 hour = 12 inches
