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

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MSHA PROGRAM POLICY MANUAL VOLUME V Subpart F Electrical Equipment - General 75.503 Permissible Electric Face Equipment; Maintenance Splices shall not be made in external wiring of permissible equipment except in connection boxes as originally approved. However, splices may be made in cables of intrinsically-safe circuits, provided the splices are made in splice boxes (not necessarily explosion-proof) or the cables are joined together by proper connecting plugs. Longwall motor and shearer cable policy is located in Volume II under 18.20. Pump motor cables’ policy is located in Volume II under 18.20. Flame-resistant cable repair sleeves are acceptable for repair of conduit hose under the following conditions: 1. Minimum wall thickness of conduit and sleeve must be 1/4 inch. If a section of damaged conduit is missing, this wall thickness may be achieved by placing a section of conduit under the sleeve before shrinking. 2. If a sleeve is used to join two pieces of conduit, the conduit ends must be cut at an angle between 30 degrees and 45 degrees from the center line of the hose and butted together tightly. All circuit breakers and other overload-protection devices shall be maintained in proper working condition. (Opening the circuit breaker on board the machine should deenergize the complete machine, except the methane monitor.) An approval plate should be attached to the machine; however, a missing approval plate does not constitute a violation. Where it is determined that a unit of equipment was shipped after January 1, 1981, and the load-locking valves are not maintained, enforcement action should be taken under this Section, for failure to maintain the electric face equipment in permissible condition. Load-locking valves provided on equipment shipped from the manufacturer prior to January 1, 1981, shall also be maintained. Appropriate enforcement action under Section 75.1725(a) should be taken if these load-locking valves are not being maintained. May 2005 (Release V-35) 51
MSHA PROGRAM POLICY MANUAL VOLUME V 75.507 Power Connection Points This Section does not prohibit the installation of high-voltage cables, control cables or telephone cables in return air. Furthermore, splices may be made in such cables if they are made in accordance with the applicable requirements of Sections 75.514, 75.603, 75.604, 75.804, and 75.810. However, unless high-voltage couplers are certified as explosion-proof, this Section prohibits their use in return air. 75.507-1 Electric Equipment Other Than Power-Connection Points; Outby the Last Open Crosscut; Return Air; Permissibility Requirement "Return air," for the purpose of this Section, means air that has been used to ventilate any working face in a coal-producing section or pillared area, or air that has been used to ventilate any working face if such air is directed away from the immediate return. "Permissible," as used in this Section, means equipment to which an approval plate, label, or other device is attached as authorized by the Secretary and which meets requirements prescribed by the Secretary for the construction and maintenance of such equipment and are designed to assure that such equipment will not cause a mine explosion or a mine fire. Consequently, this Section prohibits the use, in return air, of any unit of equipment or any device which has not been approved as permissible or certified as explosion-proof by MSHA. This Section also prohibits the use in return air of approved or certified equipment which is not maintained in permissible condition. Furthermore, this Section prohibits nonpermissible-type electric equipment on the return air side of a permanent stopping, even if it is placed directly against the stopping with a block removed. An approved or certified component which is maintained in permissible condition may be installed in return air if all nonpermissible components are installed in intake air. For instance, a certified explosion-proof motor that was formerly used on a permissible machine may be installed in return air if the motor is installed and maintained in permissible condition and all nonpermissible components, such as open switches and controllers, are installed in intake air. Section 75.1105, provides that air currents used to ventilate structures or areas enclosing electrical installations, including battery charging station, "...shall be coursed directly into the return." To comply with 75.1105, all components of batterycharging stations at stoppings or regulators that separate intake and return air courses must be located on the intake side of the February 2003 (Release V-33) 52
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