Is it code we have installed a 25 pair under ground phone cable into a building, then goes into plenum rated innerduct conduit, if part of the space the cable goes through in the building is a return air ceiling?
Also did not know if a company makes a cable that is rated for direct burial and plenum at the same time or if the plenum rated innerduct would be sufficient.
Also did not know if a company makes a cable that is rated for direct burial and plenum at the same time or if the plenum rated innerduct would be sufficient.