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What constitutes significant alteration?

Question asked by christopherlbentley on Dec 7, 2017
Latest reply on Dec 18, 2017 by milt.werner

Specification writers have a tendency of writing that systems, especially controls, must be designed and supplied to the latest code.  The particular concern I have is with a question around burner management systems for multi-burner boilers.  If a BMS were built to 8506 1998 edition and the hardware driving the logic is considered obsolete would replacing the BMS hardware be considered a significant alteration?  Would it be reasonable that new BMS hardware get installed and programmed to meet the requirements of NFPA 85 2015 while still retaining the original Code of Construction?