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What counts as alternate methods and means to allow us to use the 3 minimum clearance?

April 26, 2017alternate clearance counts means methods minimum

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What counts as alternate methods and means to allow us to use the 3 minimum clearance?

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Alternate methods and means is a process where registered design professionals submit a detailed substitute for the code requirement that will assure equivalent protection or performance, when the code standard can not be practicably applied. The FM Global Data sheet shows a 3′ clearance allowed with FR3 fluid filled transformers.