In spite many researches for mechanism of lightning and protective measures, the number of accidents increases rapidly. That number is especial high in open area because more and more people try to run away from cities for a wacation in nature. If the lightning strike is direct, more than 60% people dies instantly. Indirect lightning hit causes permanent consequences (some parts of body are paralized, high degree burns etc.) The number of accidents in houses, for example, is small because of lightning rod protection.

DIRECT LIGHTNING HIT
When lightning hits a man, certain value of voltage appears on him. Voltage will increase by increasing peak walue of current wave. If voltage exceeds the value of 100 kV, then something like "electric arc" will appear on homan body. So we can say that we got one one more paralel resistance. The electric arc resistance is much smaller than thesum of body resistance and contact resistance (Rt + 2Rk). The current that passes through human body has value of few ampers. However, the number of people who survived direct hit is small inspite the low value of current.


INDIRECT LIGHTNING HIT
Indirect lightning strike is a situation when a man isn't hit with whole lightning current but only with some part of it. The danger for man is huge if he is in circle within 100 meters from place of lightning hit. From the lightning hit place current is spreadding without control. If the current has value bigger than 100 A it can kill a man inspite of indirect lightning strike. Body parts through which the current enters or leaves have important role. A danger for man is bigger if the distance between limbs touching the ground is bigger (by walking, swimming, lying etc.).

DANGER FROM MALFUNCTIONED LIGHTNING ROD INSTALATION

Grounded metalrod creates protected area from lightning strike arount itself. But this shouldn't deceive us. If the grounded metal rod isn't set in the right way, the ressistance of groundning is too big and it could be dangerous for man. The voltage between appliance for holding and the certain place on earth (about 1-meter distance) is called "touch voltage". Danger for man can appear when current passes through metal rod into the ground, because his body has much smaller resistance than ground. The lightning current passing through ground creates voltage drop which distribution is exponentialy: near the appliance for holding voltage valuse is at the maximum and is dropping with bigger distance from it. If a man wit his own body touches two different points then the certain voltage will have effect on him. Voltage between two points on earth (about 1-meter distance) is called "step voltage". Danger from touch voltage and step voltage will be smaller if the lightning rod instalation is properly installed, ground resistance must be smaller as possible.