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1 1 These requirements cover protectors for paired conductor communications circuits to be used in accordance with

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This revision of ANSI UL 497 is being issued to reaffirm ANSI approval of the Standard The revisions are substantially in

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Fire resistance is the ability of an assembly constructed in a laboratory to contain a fire in a carefully controlled test setting for a

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These requirements cover protectors for paired conductor communications circuits to be used in accordance with Article 800 of the

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