Akranz2
Member
- Location
- Toledo, Oh, USA
I am currently in process of designing a new electrical box molded from plastic for use in a drop ceiling and got to thinking about not being able to run PVC above a drop ceiling used for plenum purposes... Flipped the code book open and found it in section 300.22(C) which states "Other Space Used for Environmental Air." with a Fine Print Note below it specifying exactly Drop Ceilings used as a Plenum space..
300.22(C)(1) Wiring Methods states basically conduit with an overall nonmetallic covering is not allowed same with cable unless its listed for use as a Plenum, nothing about boxes..
300.22(C)(2) Equipment. Electrical equipment with a metal enclosure, or with a nonmetallic enclosure listed for the use and having adequate fire-resistant and low-smoke-producing characteristics..
Now the question if it falls under 300.22(C)(2) what would be considered adequate fire-resistant and low-smoke-producing characteristics?
Does that apply to any types of plastic if so any insight to where I may find this information?
Thanks and is greatly appreciated
300.22(C)(1) Wiring Methods states basically conduit with an overall nonmetallic covering is not allowed same with cable unless its listed for use as a Plenum, nothing about boxes..
300.22(C)(2) Equipment. Electrical equipment with a metal enclosure, or with a nonmetallic enclosure listed for the use and having adequate fire-resistant and low-smoke-producing characteristics..
Now the question if it falls under 300.22(C)(2) what would be considered adequate fire-resistant and low-smoke-producing characteristics?
Does that apply to any types of plastic if so any insight to where I may find this information?
Thanks and is greatly appreciated