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Zone of Protection Equation
Bonding Distance
What are you calculating when you use the Zone of Protection equation? (i.e. what is d?)
horizontal protected distance
What is h1 of the protected distance equation for zone of protection?
height of the higher air terminal or protected roof
What is h2 of the protected distance equation for zone of protection?
height of the lower roof or object under consideration for protection
What is R of the protected distance equation for zone of protection?
rolling sphere radius = 150 feet
What is h in the bonding distance formula?
vertical distance between the bond being considered and the nearest lightning protection system bond (for buildings under 40 feet it can be considered the building height)
What is n?
n = 1 where there is only one
n = 1.5 where there are only two
n = 2.25 where are are three or more
What is Km in the bonding distance formula?
a value of 1 if the potential flashover is through the air
a value of 0.50 if through solid building material
Sample Bonding Calculations Table
Sideflash distance from a mast formula
What is the equation for sideflash distance from an overhead ground wire?