Which space classification corresponds to CMR?

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Multiple Choice

Which space classification corresponds to CMR?

Explanation:
Space classifications indicate what flame and smoke performance a cable must meet for different building environments. CMR stands for Communications Riser, which is the rating used for cables run in vertical shafts between floors. This riser environment requires a cable that limits flame propagation and smoke in vertical passages, so CMR is the appropriate match. Plenum ratings (CMP) apply to air-handling spaces where air is circulated, and outdoor ratings are for exterior exposure. General-use cables (often CM) cover typical interior non-plenum spaces. So the CMR rating corresponds specifically to the riser space.

Space classifications indicate what flame and smoke performance a cable must meet for different building environments. CMR stands for Communications Riser, which is the rating used for cables run in vertical shafts between floors. This riser environment requires a cable that limits flame propagation and smoke in vertical passages, so CMR is the appropriate match.

Plenum ratings (CMP) apply to air-handling spaces where air is circulated, and outdoor ratings are for exterior exposure. General-use cables (often CM) cover typical interior non-plenum spaces. So the CMR rating corresponds specifically to the riser space.

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