National Electrical Code Top Ten Tips: Article 540, Motion Picture Projection Rooms
- While these rooms are becoming increasingly scarce, they still exist. If you want to operate a professional projector, you have to operate it in one of these permanently constructed rooms [540.10].
- A professional projector is one that uses 35 or 70mm film that has 5.4 perforations per inch. Or, it's one that uses carbon arc, xenon, or other light source that develops hazardous gases, dust, or radiation. Thus, the special room [540.2].
- Motor generator sets and transformers for the supply or control of current to the projection equipment must be in another room if nitrate film is used [540.11(A).
- If in the same room as the projection equipment, motor generator sets and transformers for the supply or control of current to the projection equipment must be of the enclosed, fan-cooled or enclosed peip-ventilated type [540.11(A)(1)] or comply with one of the other five requirements listed in 540.11.
- Overcurrent devices not normally required or used for projectors cannot be installed in projector rooms [540.11(B)]. This means you can't locate a branch circuit panel in that room.
- Any emergency systems associated with these rooms must comply with Article 700.
- You must provide a minimum of 30 inches of working space on each side of each motion picture projector [540.12]. Same for the rear.
- Supply conductors for outlets for arc and xenon projectors can't be smaller than 8AWG 540.14].
- Any cords used on portable equipment must be approved for hard usage [540.15].
- You can also use nonprofessional projectors in these rooms [540.31].