Soviet-built buildings still remain a significant part of the architectural pattern of many Russian cities. Over the years, such buildings require deep reconstruction, including lightning protection and grounding systems.
For updating the lightning protection, core-type interception rods with a height of 4 to 8 meters were mounted at the Theater for Young Audiences in the Volga Federal District. They allow to completely cover the theater building with a protection area. The main conductors chutes were laid in hidden places, leading to the couple grounding arrangements.
Check out the news for the lightning protection solution for the Theater for Young Audiences.
Task
Calculate the lightning protection of the Theater for Young Audiences.
Solution
The lightning protection calculations for the Theater for Young Audiences were made in compliance with the following documents:
- "Electrical Installations Code" (further – EIC), EIC 7th edition.
- "Instructions for the installation of lightning protection of buildings, structures, and industrial communications" SO 153-34.21.122-2003 (further – SO).
- "Instructions for mounting the lightning protection of buildings and structures" Working Documentation 34.21.122-87 (further – WD).
Interception rods were used to protect the Theater for Young Audiences from lightning strokes. Lightning discharger consists of an interception rod, intercepting a lightning discharge, the main conductor cable, and the ground electrode. All these elements let us to divert lightning current into the ground safely, without any damage to the protected facility.
Theater for Young Audiences refers to ordinary objects for the lightning protection reasons in accordance with the equipment specification and the 3rd class per WD.
Description of the lightning protection system of the Theater for Young Audiences
A set of arrangements ensuring compliance with the lightning protection requirements is based on the following solutions:
- Mounting of 3 interception rods 8 m high is carried out by attachement to the wall. It was taken into account that 1.5 m of the interception rod height should be left for mounting.
- Mounting of 2 interception rods 7 m high is carried out by attaching to the wall. It was taken into account that 1.5 m of the interception rod height should be left for mounting.
- Mounting of 2 interception rods 4 m high is fulfilled by attachement to the wall. It was taken into account that 0,7 m of the height of the interception rod should be left for mounting.
- Interception rods are interconnected to organize two main conductors using a galvanized wire D = 8 mm from each interception rod. The main conductor cables are mounted (with mounting step 0.6-1 m):
- on the roof using connection terminals GL-11711;
- to the walls with connection terminals GL-11703A.
- Connection and branching of main conductors are made using terminals GL-11551A.
A set of measures to ensure the necessary requirements for the grounding arrangement is represented by the following solutions:
- Mounting of two grounding arrangements consisting of a horizontal electrode (galvanized steel strip with a cross-section of 4x30 mm), a depth of 0.5 meters and vertical electrodes (steel copper-clad pins with a diameter of 14 mm) 3 m long.
- The connection of the vertical and horizontal electrodes between each other is carried out by using terminal ZZ-005-064.
- The connection of the main conductor cable with the output of the galvanized ground strip is performed with the control tetminal GL-11562A.
- The design of the grounding arrangement corresponds to clause 1.7.55 of EIC Grounding arrangements for protective grounding and grounding for lightning discharges are common.
The depicted protection area corresponds to area B, constructed as per Appendix 3 of WD.
Picture 1. Lightning protection plan for the Theater for Young Audiences
Условные обозначения - Conventional symbols
Стержневой молниеприемник - Interception rods
Горизонтальный заземлитель - Horizontal ground electrode
Вертикальный заземлитель длиной 3 м - Horizontal ground electrode 3 m long
Токоотвод - Main conductor cable
Зажим для подключения проводника (ZZ-005-064) - Main conductor connection terminal (ZZ-005-064)
Зажим для соединения токоотводов (GL-11551A) - Terminal for connecting main conductor cables (GL-11551A)
Зажим контрольный (проволока-полоса) (GL-11562A) - Control terminal (wire-strip) (GL-11562A)
Picture 1. Lightning protection plan for the Theater for Young Audiences
Do you have any questions about grounding and lightning protection of the Theater for Young Audiences? Please, contact the ZANDZ Technical Center!
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