![]() ![]() Saba’s research on this topic was supported by FAPESP. The image is so special that it appeared on the cover of the 28 December 2022 issue of Geophysical Research Letters (GRL) – one of the most important scientific journals in the field –, which featured an article with Saba as first author. With a high-speed camera and the luck of being in the right place at the right time, physicist Marcelo Saba, a researcher at Brazil’s National Space Research Institute (INPE), and PhD candidate Diego Rhamon obtained a unique image of lightning strikes showing details of the connections to nearby buildings. Thanks a lot!!!! I put up 4 new pictures to show what i'm talking about:Image: The image captured with a high-speed camera shows several lightning rods trying to connect to the downward discharge. It will be covered with granite but not for about a month so didn't want to have a problem. Really a strong structure and connected to itself throughout. It has a net of thick (probably 1/2" rebar) in the footing which is about 3'x3' and then the rebar is connected to a riser of the same type of rebar and then a heavy metal plate with 4 metal feet soldered to it is set in that rising network of rebar and the whole thing is incased in cement and then the beams are welded to that. The iron is well connected to the concrete also. I was unsure of the conducting ability of concrete. ![]() If the iron frame is completely covered with granite you may not attract many strikes anyway. We started investigating and found the rebar had not been bonded.Ī few very large down lines from the antenna ground plate on the roof took care of the problem. I worked in a building were we lost all sorts of radio gear on the roof repeatedly. In this case the rebar is bonded to create a path down to the ground contact footings of the building. Steel frame buildings with concretes footings do not require any additional grounding.Ĭoncrete buildings can have problems wit the non-earth contact upper floor concrete not conducting well. Your large steel sections will have a resistance that is more than low enough. The reason we use copper down wires is for the low resistance of copper. Your iron structure is already well grounded. They are in concrete footing about 1 meter deep." "It looks like I'm creating a lighting rod but they are iron and not copper and not touching the earth directly. Should I put in a lighting arresting system separately or can i attach a wire to the bass of one or all of these vertical I beams and ground it that way? Or is it ok the way it is? I've put some pictures up here to see better. They are in concrete footing about 1 meter deep. So my question is: It looks like I'm creating a lighting rod but they are iron and not copper and not touching the earth directly. The iron will enter the ground at 8 points around the structure with 8 I beams that are 6 meters long. The roof will also be iron on the main supports. A second floor and the skeleton of the structure is iron, which will be covered with granite. Now we are adding a new addition to the house. I live on the top of a mountain and have lighting parts of the year but never had any problems. I have a lightning rod question maybe someone can answer.
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