beanland
Senior Member
- Location
- Vancouver, WA
If a suspended ceiling is installed and the space above it is a return-air plenum, do the troffers installed in the ceiling need to be plenum-rated per NEC 300.22(C)(3)?
What about their whips? Do they have to be plenum-rated per 300.22(C)(1)?
What about their whips? Do they have to be plenum-rated per 300.22(C)(1)?
