2024年8月16日 · So I have this project where the area above the strut grid is a plenum space. I am installing EMT and 4 Square J-boxes. I have been looking for some verbiage in the NEC …

2020年9月8日 · The plenum is the space or structure the air flows in in an HVAC system. Most often in commercial buildings the space above the ceiling is the return plenum for the HVAC …

2011年12月12日 · Not sure if this has been addressed before, but can anyone provide a code section that requires junction box's (1900 / 411's) to be plenum rated in a space that is used …

2023年4月4日 · A lot of people don't realize, but AC90 is not FT6 either, but it has been accepted to be used in plenum space. I would run AC90 or conduit in the plenum space then transfer to …

2012年1月26日 · The wiring methods for such other space shall be limited to totally enclosed, nonventilated, insulated busway having no provisions for plug-in connections, Type MI cable, …

2014年10月12日 · if the area is used as a giant duct to move air, then it's a plenum. If the giant duct isn't a duct, but an area like the area above the ceiling, it's called an environmental air …

2024年7月24日 · You cannot have electrical boxes run in a cold air return plenum. Electrical cables are allowed to pass 90* through a plenum, but cannot be run in the plenum (residential …

2012年11月7日 · This is why we always plan for plenum rated wire in commercial bids. Are you referring to the 2011 changes 300.22(C)(2)? New Section 300.22(C)(2) was added to cover …

2014年1月30日 · A plenum is not just any open space in which air may flow, it is a space specifically dedicated to carrying environmental air: Plenum . A compartment or chamber to …

2016年3月17日 · A plenum is any space that is intended to have pressurized air flowing in it, either supply or return. So a duct is a plenum, but a plenum is not necessarily a duct, if you get …