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  1. SPKsales

    Butterfly Valve Pre-wired Tamper Switch Requirements

    I believe somewhere in an NFPA book there is a clause stating my answer however I am having trouble locating it. If a Butterfly Valve with a pre wired tamper switch is installed to a wet fire sprinkler riser in place of an OS&Y valve with no existing tamper switch is it a requirement to wire...

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