Which cable shall be used when Class 2 circuits are run vertically and penetrate more than one floor?

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Multiple Choice

Which cable shall be used when Class 2 circuits are run vertically and penetrate more than one floor?

Explanation:
When Class 2 circuits run vertically and pass through more than one floor, you need a cable that is specifically rated for riser use. CL2R is designed for this exact situation: it is a Class 2-rated cable with a riser (vertical) rating, meaning its jacket and insulation are tested to limit fire and smoke spread in vertical shafts and in between floors. This helps maintain fire compartment integrity as cables traverse multiple levels. The other options don’t provide that riser-specific rating. CM is a general-purpose building cable not intended for vertical, multi-floor riser runs. THHN is a single-conductor in conduit type insulation used in raceways, not a cable suitable for standard in-wall use across floors. CAT5 is a data cable that may have its own ratings, but without the required Class 2 riser listing, it isn’t appropriate for this vertical, multi-floor requirement. So the correct choice for this scenario is the CL2R cable.

When Class 2 circuits run vertically and pass through more than one floor, you need a cable that is specifically rated for riser use. CL2R is designed for this exact situation: it is a Class 2-rated cable with a riser (vertical) rating, meaning its jacket and insulation are tested to limit fire and smoke spread in vertical shafts and in between floors. This helps maintain fire compartment integrity as cables traverse multiple levels.

The other options don’t provide that riser-specific rating. CM is a general-purpose building cable not intended for vertical, multi-floor riser runs. THHN is a single-conductor in conduit type insulation used in raceways, not a cable suitable for standard in-wall use across floors. CAT5 is a data cable that may have its own ratings, but without the required Class 2 riser listing, it isn’t appropriate for this vertical, multi-floor requirement. So the correct choice for this scenario is the CL2R cable.

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