## Calculate the height

Lightning is a mast of a conductive material.Mast digged in the earth, and deep enough.If you build a lightning rod for all the rules, a lower end thereof to be recessed until the aquifer.The height of the lightning conductor is calculated as follows.Imagine that dug into the ground pole is the height of the cone.The top of the cone coincides with the top of the pole, the angle between the height and the generator is 45 °.Anything that falls inside the cone, will be protected.

Select a location for the pole.Draw from this point on the ground directly, so that all the buildings were inside the imaginary cone.The longest of these lines, and will be equal to the height of the aer
ial part of the mast.To add this value to the depth of the well of the aquifer.
imaginary cone cross section is an isosceles right triangle.All calculations can be carried out by the Pythagorean theorem.

## Materials

material from which you will make a lightning rod must be electrically conductive.Most suitable conventional iron pipe.Part of it can be painted to protect against corrosion.One end of what will be at the top, NOT, leave.Sometimes it can be seen in the villages of wooden lightning rods, in which only the upper part is made of metal.It is believed that the wood under the influence of moisture begins to conduct electricity.This is incorrect, as the rainwater carries virtually no current.But you can use pieces of wood.On a wooden pole should fill the long pieces of metal wire or tin tape.Make it better by means of the most common nail.It took another stretch - pieces of metal wire, as well as support for them.Number of extensions calculate with such a condition that, when damaged, one of them, or even several pole fell.
ends of the metal wires must go into the aquifer.

## Installing a lightning rod

Iron mast must stand vertically.You can make an additional metal bottom contour.This will improve the barrier properties and will make more stable mast.Stretching attach to the mast and bolted stakes.

## Lightning without mast

Putting a separate lightning rod is not necessary if you have a house with a high roof.In this case, a lightning rod is the highest point of the roof (for example, the spire).But it is necessary to make ground, i.e. just to the edge of the roof to attach the metal wire, leaving the other end of the ground.