What is the weight per length of copper Class I cable?
187.5 lbs/ 1000 feet
What is the weight per length of copper Class II cable?
375 lbs / 1000 feet
What is the weight per length of aluminum Class I cable?
95 lbs/1000 feet
What is the weight per length of aluminium Class II cable?
190 lbs/1000 feet
What is the diameter of Class II aluminium solid air terminal?
What class can tubular air terminals be used for?
What is the coarse and fine thread count of a 1/4" bolt?
20 and 28
What is the coarse and fine thread count for a 1/2" bolt?
13 and 20
What is the equation for slope?
Rise / Run
What year was the Lightning Protection Institute founded in?
The Lightning Protection Institute promotes what?
What are the three standards in the United States for lightning protection?
What five elements need to be in place provide an effective lightning protection system?
Strike termination devices
Grounding electrode system
Surge Protection Devices
What do lightning protection component materials need to be?
Resistant to corrosion
Protected from accelerated deterioration
What is electrically charged around us?
What proper resistance is expected of a proper grounding electrode if the soil is of normal restivity?
less than 50 ohms
Copper components installed with 24 inches of a top of a chimney or vent that emits corrosive gases shall be what?
protected by lead or tin coating
Aluminum conductor shall not be attached or installed in what three circumstances?
embedded in concrete/masonry
subject to excessive moisture
Connector fitting shall be used at what three splices?
What amount of lbs shall all fittings be able to withstand in a pull test?
Which Class can crimp type connectors be used in?
Class I only.
What is the minimum outside diameter of masonry anchors?
How far above the object shall air terminals extend to protect the object?
no less than 10"
What is the wind resistance area of an ornament or decoration?
no greater than 20 square inches
What span and slope can a pitched roof have?
A span of 40 ft or less and a slope of 1/8 or greater OR
a span of 40 ft or more and a slope of 1/4 or greater
What is the horizontal protected distance formula?
What happens to the zone of protection when the protection is no higher than 25 feet above grade?
1 to 2
What happens to the zone of protection when the protection is higher than 25 feet but lower than 50 feet?
1 to 1
How many feet above grade is it required to protect down conductors from mechanical damage?
How many feet above grade is it required to protect down conductors that are entering into corrosive soil?
What is the minimum diameter and length of ground rods?
1/2" and 8 ft long
How far shall ground rods extend vertically?
not less than 10'
What is the separation between any two ground rods?
at least the sum of the rod lengths
All grounded media and buried metallic conductors that can assist in providing a path for lightning currents in or on a structure shall be interconnected to the system within how many feet of the base of the structure?
What are the three different situations for grounding in shallow top soil?
Soil a minimum of 18 inches - ground ring/radial/ plate
Soil less then 18 inches deep - ground ring/radials/plates
No soil (solid rock) - conductor can be laid directly on bed rock extending a minimum distance of 2 feet from the foundation (ground plate termination)
For structures exceeding 60 feet in height, what shall the interconnection of lightning protection grounding electrodes and other grouneded media be in the form of?
a ground loop conductor
What standards does it require that buildings over 60 feet in height require a ground loop?
LPI 175 and NFPA 780
What does the interconnection of building system ground devices include?
Antenna system grounding
Within how many feet is it required to bond underground metallic piping systems (water, gas, conduits, petroleum) of a structure?
What is the common bonding point if the grounded systems (water, gas, electric, communications) are interconnected at a common accessible point in the structure?
A ground bar
A section of water pipe OR
The metallic structural frame
Metal bodies located outside or inside the structure that contribute to lightning hazards shall be what?
interconnected with the lightning protection system
Do metal bodies grounded automattically through the structural connection (steel frame) need additional bonding?
What is potential equalization?
the bonding together of grounded systems at different building height intervals to eliminate side flash
Structures exceeding 60 feet in height need what three potential equalizations?
Roof-Level (12 feet)
Structures up to 60 feet in heigh need what two potential equalizations?
Roof-level (7 feet)
How small can ground loop conductors be?
no smaller than main lightning conductor
Should SPDs be grounded through a lightning protection down conductor?
Where are SPDs installed?
All power service entrances
What dp SPDs need to be in compliance with?
UL 1449 Edition 3
What shall surge protection be provided for?
What three things should be considered when selecting SPDs?
What shall SPDs for data and signal line protection have?
common mode protection
When installing strike termination devices on structural steel what are the intervals?
air terminals are connected to the metal framework at intervals not exceeding an average distance of 100 feet and are to be as widely spaced as possible.
When fastening conductor to a metallic column what is the diameter and how many threads need to be fully engaged?
no less than 1/2 inch in diameter
at least 5 threads fully engaged
When installing ground electrodes that are connected to metallic columns, how are they installed?
around the perimeter of the structure at intervals averaging not more than 60 feet apart.
What is a low resistance continuous metallic path designed for the purpose of transferring lightning from the top of a structure into the earth?
lightning protection system
What can be used for protecting down conductors from mechanical damage?
metal laid over the conductor
When does the zone of protection arc change to 100 feet?
Masts (2 or more)
How far away do silos and storage tanks have to be to be classified as standing alone?
What determines an adjacent storage structure?
if it is 6 feet or less away from the main building but not attached
How tall is a heavy duty stack and what is the single cross-sectional flue area?
more than 75 feet
flue area exceeds 500 square inches
What class materials should heavy duty stacks have?
The upper 25 feet of a heavy duty stack shall have what?
a continuous covering of lead
Can you used aluminum material on heavy duty stacks?
What are the intervals of air termainls on the rim of stacks?
not exceeding 8 feet
How far shall air terminals extend above the heavy duty stack?
> 18 inches <30 inches
On heavy duty stacks how far above earth are down conductors to be protected from damage?
At least 8 feet
If ground rods are used for a heavy duty stack what is the diameter and length?
5/8 inch and 10 feet long
How far away does a metal water pipe system have to be to be bonded with the LPS of a stack?
How far away do trunks of trees have to be from a structure to provide lightning protection?
within 10 feet
What are the three design concerns as it relates to open shelters?
Sideflash (to person/animal)
Should aluminum materials be used on trees?
When protecting an open structure how many down conductors should there be?
a down conductor for every corner
How shall clamps be secured to ground rods and down conductors?
Make contact for 1 1/2 inches
Secured with at least two bolts
When should connections to ground electrodes be made?
Not less than 1 foot below grade
Not less than 2 feet away from the foundation wall
How far shall ground rods be extended vertically?
not less than 10 feet
What are the three things ground rods can be made of?
Stainless Steel (corrosive)
Masonry anchors are
What type of metal body must always be considered for bonding?
non-isolated metal body
How thick must metal be to be used as an air terminal or main cable conductor?
At least 3/16" thick
What is the minimum thickness and surface area of a ground plate?
0.032 inches thick and 2 square feet
What are the three approved materials for lightning protection?
What is the equation for the circumference of a circle?
What is the correct angle of an extension ladder?
Keep a 4 to 1 ratio
Where should ladder's be tied off?
Top and bottom
When working on electrical circuits what is the best type of ladder to use?
What is the awg size of a 100' extension cord?
What is the output of a generator?
What is the most recent edition of the LPI 175 standard?