There are several ways to calculate a single lightning arrester. We will study the options below.
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Calculation using a technique provided in SO 153-34.21.122-2003, Appendix 3.
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Calculation using a technique provided in RD 34.21.122-87, Appendix 3.
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Lightning arrester calculation using a special software according to SO 153-34.21.122-2003, item 3.3.1. Such software is publicly available and titled Calculation Service for Lightning Protection Reliability and Probability of the Lightning Breakthrough to the Facility.
Using items 1 and 2, the engineer will use the calculation techniques to generate protection zones which are drawn on the building plan and facade drawings. Moreover, most often, the zones built using SO will be stricter than the zones as per RD. The protected facility should be fully located in the calculated protection zone of the lightning arrester. The technique benefits include visiblity and regularity, while its disadvantages include too many requirements to the lightning rod height.
When using option 3, the engineer obtains actual lightning protection system reliability and estimated number of lightning strikes to the system. Based on these data, you can easily select the lightning rod height for the required reliability of the system according to the requirements of the effective regulatory documents. The benefits of the technique include flexibility and transparency of the calculation results, and the absence of excessive requirements to the lightning arrester's height which will ultimately lead to savings.
If you need to perform calculations of the lightning rod height, you can also contact the ZANDZ Technical Center!
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