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901.9.1 Additions, Alterations or Repairs
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Additions, alterations, renovations or repairs to existing systems shall conform to that required for new systems without requiring the existing system to comply with all of the requirements of this code, except as otherwise required in Sections 901.9.2 through 901.9.6. Additions, alterations or repairs shall not cause an existing installation to become unsafe, hazardous or overloaded.