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Special Controls

Laser optical fiber transmission systems that use optical cables are considered enclosed systems, which are considered Class 1 systems in normal operation. During installation or maintenance, or when an accidental break in the cable occurs, and the accessible emission is above the MPE, the following procedures apply:

  • Only authorized trained personnel shall be permitted to perform service on light wave transmission systems if access to laser emission is required.
  • Only authorized trained personnel shall be permitted to use the laser test equipment (Optical Loss Test Set, Optical Time Domain Reflectometer, etc.) during installation or service.
  • All unauthorized personnel shall be excluded from the immediate area of access to laser radiation during service and installation when there is a possibility that the system may become energized. The immediate area shall be considered a temporary laser-controlled area.
  • Staring into the end of any broken, severed, or unterminated optical fiber or cable shall be avoided.
  • The end of any broken, severed, or unterminated optical fiber shall not be viewed with unfiltered optical instruments (microscopes, telescopes, etc.). An exception to this is the use of indirect image converters such as an infrared image converter or closed-circuit television system for verification that a fiber is not energized.
  • During a splicing operation (either installation or service), if it is required that the ends of the fiber be examined with an eye-loupe for a satisfactory cut, only an eye-loupe containing an appropriate filter shall be used. If a fusion splicer is used, the appropriate operating safety procedures shall be rigidly adhered to.

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