21. The good news for Manhattanites is that modern high-rise buildings have built-in lightning protection systems. 22. There are at least 300 listed certified installers of total lightning protection systems, Shaw said. 23. For lightning protection , it suffices to consider all possible spheres as they touch potential strike points. 24. The incident happened as a result of the lack of lightning protection on the Merlion itself. 25. But even a properly grounded antenna does not afford adequate lightning protection for the average home. 26. Extensive lightning protection is required for insulated towers. 27. However, the benefits of basic lightning protection systems have been evident for well over a century. 28. Proper lightning protection is a lasting investment, as Robert McCracken and his wife, Sarah, can attest. 29. There were patchwork efforts to shore up weak points and a lightning protection system was installed. 30. :The main purposes of grounding are : lightning protection , and protection against downed high-voltage power lines.
