The unlisted OSP limit inside a building is 15 meters.

Study for the BICSI OSP Design Test. Prepare using multiple choice questions, with hints and explanations to enhance understanding. Succeed in your exam journey!

This tests the rule for how much unlisted outside plant cable can be inside a building before a transition to indoor-rated cabling is required. Cables not listed for indoor use may not meet indoor fire ratings, moisture, or temperature requirements, so inside the building you limit their presence. The guideline sets a maximum of 15 meters of unlisted OSP inside a building; beyond that point, you must transition to a listed indoor-rated cable or enclosure.

In practice, this means you route any unlisted OSP only a short distance into the building (up to 15 meters) and then switch to equipment and cabling that are specifically rated for indoor use. This helps maintain safety, performance, and code compliance. The other options imply there’s no defined limit or no basis for the limit, but the standard provides a defined 15-meter limit, making the statement true.