(An example of a multi-residential building on the photo).
The problem was as follows:
1. Lightning protection components
Create one lightning protection specification based on Galmar equipment for 8 sections. Show connection nodes on layouts with the reference to specifications. Lightning protection meshed cage made of steel wire D = 8 mm laid at the rooftop is used as an air terminal. The step of the meshed cage is maximum 10 m.
Rebars at least 8 mm in diameter embedded in reinforced concrete walls are used as down conductors.
2. Grounding components
Pile rebars are used as vertical ground electrode system. As a horizontal earth electrode used reinforcement cage pile cap.
All metal elements protruding over the roof of the building (ventilation shafts, metal ladders, etc.) must be connected to the building's steel structures.
ZANDZ.com experts have analyzed the situation and proposed the following solution:
Install a system of lightning protection rods, meshed cages to provide a necessary level of protection reliability against direct lightning strikes. The chart clearly shows the protection zone provided by the properly located lightning protection air terminals.
A part of the circuit is shown in the image below.
The final specification includes 12 elements of the exterior lightning protection system elements totaling to 2,234 pieces and 4,000 meters of copper-bonded wire:
- GL-21105G, Vertical air terminal (air terminal mast) (5.7 meters);
- GL-21104G, Vertical air terminal (air terminal mast) (4.7 meters);
- GL-21122, Air terminal mast (4.5 m on 3 of concrete pads; single-step guy wire);
- GL-21201. air terminal mast fastening to a chimney;
- GL-21202. GL-21104G air terminal mast fastening to a chimney;
- GL-20022. GL-21101G air terminal mast clamp for down conductors (stainless steel);
- GL-11149-10/20/50, copper bonded wire (D8 mm / S 50 mm²; 10/20/50 meters coil);
- GL-11711. Down conductor clamp for flat roofs (plastic, concrete);
- GL-11551A, Down conductor clamps;
- GL-11703A. Facade clamp for down conductors elevated 15 mm above the clamp;
- GL-11545A, Down conductor-to-gutter clamp;
- GL-11563A, Control clamp for wire-to-wire electrode connection.
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