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One of the recent questions (link):
According to SO 153-343.21.122-2003 the distance between down conductors for category-3 lightning protection should be 20 m. At the site, part of the building stands on supports 29 m apart, which violates the requirements of SO 153-343.21.122-2003. What should be done in this case?
In this case there is very limited choice: if the construction allows for it, then an additional down conductor should be installed on its facade or wall. It is should be mounted in such a way that average distance between them works out to 20 meters. The distance recommended by SO 153-343.21.122-2003 is an average, so the requirements would not be violated.
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