Current through Register Vol. XLI, No. 37, September 13, 2024
Section 36-9-3 - Definitions3.1. Approved. -- The term "approved" shall mean in strict compliance with mining law, or in the absence of law, accepted by a recognized standardizing body or organization whose approval is generally recognized as authoritative on the subject.3.2. Permissible. -- The term "permissible" shall mean any equipment, device or explosive that has been approved as permissible by the United States Bureau of Mines and meets all requirements, restrictions, exceptions, limitations and conditions attached to such classification by the Bureau.3.3. Certified Electrician. -- The term "certified electrician" shall mean any person who is qualified as a mine electrician and who has passed an examination given by the Department of Energy, or has at least three years of experience in performing electrical work underground in a coal mine, in the surface work areas of an underground coal mine, in a surface coal mine, in a non-coal mine, in the mine equipment manufacturing industry, or in any other industry using or manufacturing similar equipment, and has satisfactorily completed an electrical training program approved by the Department of Energy.3.4. Armored Cable. -- The term "armored cable" shall mean a cable provided with a wrapping of metal, usually steel wires or tapes, primarily for the purpose of mechanical protection.3.5. Borehole Cable. -- The term "borehole cable" shall mean a cable designed for vertical suspension in a borehole or shaft and used for power circuits in the mine.3.6. Cable. -- The term "cable" shall mean a standard conductor (single conductor cable) or a combination of conductors insulated from one another, (multiple conductor cable).3.7. Flame-Resistant Cable, Portable. -- The term "flame-resistant cable, portable" shall mean a portable flame-resistant cable that has passed the flame tests of the federal bureau of mines.3.8. Portable (Training) Cable. -- The term "portable (training) cable" shall mean a flexible cable or cord used for connecting mobile, portable or stationary equipment to an external source of electric energy where permanent mine wiring is prohibited or is impracticable.3.9. Branch Circuit. -- The term "branch circuit" shall mean any circuit, alternating current, connected to and leading from the main power lines. 3.10. Circuit Breaker. -- The term "circuit breaker" shall mean a device for interrupting a circuit between separable contacts under normal or abnormal conditions.3.11. Zig-zag Transformer (Grounding Transformer). -- The term "zig-zag transformer (grounding transformer)" shall mean a transformer intended primarily to provide a neutral point for grounding purposes.3.12. Neutral Point. -- The term "neutral point" shall mean the connection point of transformer or generator windings from which the voltage to ground is nominally zero, and is the point generally used for system groundings in wye-connected a.c. power system.3.13. Neutral (Derived). -- The term "neutral (derived)" shall mean a neutral point or connection established by the addition of a zig-zag or grounding transformer to a normally ungrounded power system.3.14. Effectively Grounded. -- The term "effectively grounded" is an expression which means grounded through a grounding connection of sufficiently low impedance (inherent or intentionally added or both) so that fault grounds: which may occur cannot build up voltages in excess of limits established for apparatus, circuits or systems so grounded.3.15. Grounded (Earthed). -- The term "grounded (earthed)" shall mean that the system, circuit, or apparatus referred to is provided with a ground.3.16. Ground or Grounding Conductor (Mining). -- The term "ground or grounding conductor (mining)", also referred to as a safety ground conductor, safety ground and frame ground, shall mean a metallic conductor used to connect the metal frame or enclosure of any equipment, mine track device or wiring system to an effective grounding medium.3.17. Delta Connected. -- The term "delta connected" shall mean a power system in which the windings or transformers or A. C. generators are connected to form a triangular phase relationship, and with phase conductors connected to each point of the triangle.3.18. Wye-connected. -- The term "wye-connected" shall mean a power system connection in which one end of each phase windings or transformers or a.c generators are connected together to form a neutral point, and a neutral conductor may or may not be connected to the neutral point, and the neutral point may or may not be grounded.3.19. High Voltage. -- The term "high voltage" shall mean voltages of more than one thousand volts.3.20. Medium Voltage. -- The term "medium voltage" shall mean voltages from six hundred sixty-one to one thousand volts.3.21. Low Voltage. -- The term "low voltage" shall mean up to and including six hundred sixty volts.3.22. Lightning Arrester. -- The term "lightning arrester" shall mean a protective device for limiting surge voltage on equipment by discharging or bypassing surge current to ground, and is capable of repeating these functions as specified.3.23. Power Center or Distribution Center. -- The term "power center or distribution center" shall mean a combined transformer or distribution unit, complete within a metal enclosure from which one or more power circuits are taken.