Projection Devices

  • Provides detailed information about the practice of selecting a projection device.

     

    Fully realizing the educational advantages of projection devices in the classroom, Guilford County Schools has carefully evaluated the purchase, use, and maintenance of these devices. Consideration was given to use, cost, and safety. The resulting practices, derived from this evaluation, are as follows:

     

    • Only mounted projection devices will be approved for purchase in most circumstances.
      • Mounted devices will be installed by a GCS approved installation contractor.
      • Power and cabling to support projection devices will be installed in a permanent manner by a GCS approved installation contractor.
         
    • Wall mounted, short throw projectors are recommended over ceiling mount devices.
       
    • Portable projection devices will be allowed for purchase in limited cases.
      • Gymnasiums and/or multi-purpose rooms where mounted devices would be a danger to students or would be in danger from balls and other PE equipment.
      • Auditoriums where the use of projection devices would be on a one-day, short-term use basis.
      • Other areas where temporary, one day or less, use would be the norm.
      • Replacing a projection device that is part of an existing approved installation where all safety concerns (OSHA, National Fire Protection Association: Life Safety Code & National Electrical Code) have been met and/or exceeded.
        • When purchasing a portable projection device, Technology Services suggests that you also purchase a laptop or other mobile device to go with the mobile cart and projector.  Please contact Technology Services for the latest recommended cart solution and applicable quotes.

     

    Considerations for these practices include:

    • Classroom Use
      • Tables or carts for projection devices take up valuable space in the classroom.
      • Interactive features of the projection device are not available or more difficult to use with portable devices.
      • Shadows and visibility are increased with mobile devices.
         
    • Cost
      • When considering the cart, cables, and bulb life, the cost of a mobile device can and usually exceeds the cost of a mounted system.
         
    • Equipment Maintenance
      • Movement and shaking of projection devices can limit the lifetime of the bulb.
      • Overheating due to restricted airflow from classroom materials around the device.
      • Calibration of the image and interactive features must be performed with every small movement of the device.
         
    • Safety Concerns
      • Tripping hazards created with cords across the floor and in exit and/or walking pathways.
      • Fire safety concerns with the use of extension cords that can become worn and frayed from contact with the floor and being stepped on or pulled.
         

    Safety codes relating to these practices include:

    • Occupational Safety and Health Administration (OSHA) standards
      • 1910.37(a)
        • The danger to employees must be minimized.
      • 1910.37(a)(3)
        • Exit routes must be free and unobstructed. No materials or equipment may be placed, either permanently or temporarily, within the exit route.
      • 1910.305(a)(2)
        • Temporary electrical power and lighting installations of 600 volts, nominal, or less may be used only as follows:
        • 1910.305(a)(2)(i)(c)
        • For a period not to exceed 90 days for decorative lighting, carnivals, and similar purposes;
        • 1910.305(a)(2)(iii)
        • Temporary electrical installations shall be removed immediately upon completion of the project or purpose for which the wiring was installed.
        • 1910.305(a)(2)(v)(c)
          • No branch-circuit conductor may be laid on the floor.

    •  National Electric Code, NFPA 70
      • 400.8 Uses Not Permitted
        • …flexible cords and cables shall not be used for the following:
        • (1) As a substitute for the fixed wiring of a structure.

    • North Carolina Fire Prevention Code
      • 605.5 Extension Cords
        • Extension cords and flexible cords shall not use a substitute for permanent wiring. Extension cords shall not be…subject to environmental damage or physical impact.

     

    • Life Safety Code, NFPA 101
      • 7.1.10.2.1
        • No furnishings, decorations, or other objects shall obstruct exits or their access thereto, egress there from, or visibility thereof