It has an angle of protection, about how many degrees?
The current that causes the step voltage is the lightning current that the lightning rod releases to the ground through the lead wire and grounding device (note lightning current). As for your problem, there are also answers in GB50057-94, usually at least 3M from the protection, but you should consider the situation around the building, such as metal pipes, underground lines and so on.
The problem itself is a small problem, if not understood, it should be said how to achieve the protection of lightning protection range, maximize utilization.
The angle of protection is calculated by GB50057-94 in China, which is calculated by the ball rolling method. But in Japan, the 45 degree method is used to calculate the point of the lightning rod. Protected areas surrounding the intersection with the lightning arrester at the bottom of the vertex and triangle as the lightning rod, of course, this is a point of view, from the spatial point of view is a lightning arrester height radius, the highest point vertex hemispherical region.
