Program Policy Manual - VOLUME V - Mine Safety and Health ...

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MSHA PROGRAM POLICY MANUAL VOLUME V Any fire sensor and warning device system installed in a return airway must be approved as permissible by the Approval and Certification Center under Part 23. An approval under Part 23 requires that only components specified in the approval may be used with the system unless authorization for the use of different components has been obtained from the Approval and Certification Center by the mine operator. The unauthorized substitution of components different from those which were specified in the approval of a permissible fire sensor and warning device system used on a belt conveyor in a return airway shall be cited as a violation of Section 75.1103-7(b). Some coal mines have intermixed heat sensors and heat sensor cables with reverse conductor color codes in the same polarized fire sensor and warning device system. Therefore, heat sensors which are polarized so that the white conductor must be positive have been installed in heat sensor cables which are polarized so the black conductor must be positive. Likewise, heat sensor cables which are polarized so that the white conductor must be positive have been connected to heat sensor cables which are polarized so that the black conductor must be positive. If the colors are matched when splicing heat sensors and heat sensor cables with one conductor color code into heat sensor cables of the opposite conductor color code in accordance with customary electrical practice (black to black, white to white), the system will malfunction and no audible or visual signal will appear at the control station when an improperly polarized heat sensor(s) is activated. Although it is possible to correctly intermix heat sensors and heat sensor cables of opposite conductor color codes in polarized fire sensor and warning device systems, the potential confusion created by the differences in conductor color codes could create a safety hazard. Even if assurances are given that initial installation will be done in accordance with instructions to splice black to white conductors, there can be no satisfactory assurance that later maintenance will always be performed correctly because the method is contrary to common practice. Therefore, the use of heat sensors and heat sensor cables with opposite conductor color codes within the same polarized fire sensor and warning device system is not acceptable under Section 75.1103-2. Enforcement personnel should recognize that it is not important which conductor color code is used in a polarized fire sensor and warning device system as long as the conductor color code and polarity of all heat sensors and heat sensor cables within the system are the same and the polarity of the heat sensors October 2003 (Release V-34) 105
MSHA PROGRAM POLICY MANUAL VOLUME V cable is compatible with the control unit and other components of the system. The assistance of a coal mine inspector (electrical) or electrical engineer should be requested, when necessary, to determine if a mine operator has installed heat sensors or heat sensor cables with opposite conductor color codes within a polarized fire sensor and warning device system. Other sensors addressed in paragraph (a)(2) that respond to effects of fire other than heat may be acceptable subject to individual determination. The Technical Support Group, in Bruceton, Pennsylvania, will provide assistance where needed in making this determination. "Unplanned removal of power" and "preplanned removal of power" referred to in paragraphs (a)(3) and (e) do not include those times when it is necessary to remove the power to make minor repairs or adjustments. An examination is not required for that period of time normally required for shift change, provided the time required for shift change does not exceed 2 hours. Where the operator chooses to make the examinations referred to in lieu of an automatic fire sensor and warning device system that will provide the 4-hour protection, the examination referred to would be required if the power supply to the sensor and alarm is removed, or the power is removed from the belt for more than 30 minutes during a production shift, or the belt is stopped prior to the beginning of an idle shift or an idle period such as weekends or holidays. A battery must be disconnected automatically from the sensor system in the event the power is cut off as required by Section 75.321, unless the sensor system is intrinsically safe. 75.1103-5 Automatic Fire Warning Devices; Manual Resetting "Effective warning signal" as used in paragraph (a) of this Section means "a signal indicating an emergency and requiring immediate action." Both audible and visual signals shall be provided as required by Section 75.1103-1. The audible signal shall be capable of being heard from any point within the full range of the assigned duty locations of the person referred to in paragraphs (a)(1) and (a)(2), and the signal shall be audible above the normal sounds of the mining operation. This Section should be used to cite a failure of the system, when activated, when it does not provide an effective warning signal at either the work locations where miners may be endangered from a October 2003 (Release V-34) 106
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