11Haze29
Member
- Location
- Rhode Island
- Occupation
- Electrical Engineer
I'm running some fiber optic from outdoors to indoors. I need to go above a suspended ceiling (plenum) that is used for return air handling. Run will be more than 50ft.
770.2 Definitions, point of entrance ....from rigid metal conduit...
So if I used rigid conduit through the space I could use unlisted cable.
770.113(C) Other spaces used for environemental air (plenums). (4) OFNR, OFCR (which is riser rated) installed raceways that are installed in compliance to 300.22(C)
300.22 (C) (1) Wiring methods ...Other types of cables... shall be permitted to be installed in EMT...
This seems to tell me that if I specify Riser rated cable, I can run it through the plenum, if it is installed in EMT.
Bit tricky understanding this, so I am asking if the above is correct? Comments welcomed.
770.2 Definitions, point of entrance ....from rigid metal conduit...
So if I used rigid conduit through the space I could use unlisted cable.
770.113(C) Other spaces used for environemental air (plenums). (4) OFNR, OFCR (which is riser rated) installed raceways that are installed in compliance to 300.22(C)
300.22 (C) (1) Wiring methods ...Other types of cables... shall be permitted to be installed in EMT...
This seems to tell me that if I specify Riser rated cable, I can run it through the plenum, if it is installed in EMT.
Bit tricky understanding this, so I am asking if the above is correct? Comments welcomed.