if I build a faraday cage just to protect device from lightning or other electrostatic source (not electromagnetic pulse), and I need that as light as possible... I will build it using a mesh to make it light.. now, how large the mesh' holes is allowed ? is there any calculation for this purpose ? what in my mind is: I can use mesh with holes as large as possible...as long as the distance from electrostatic source to the mesh' wire is shorter than the distance from electrostatic source to the device I want to protect... is it right ? or there another thing I need to consider to decide the holes size ?