reglab/statecodes huggingface dataset:
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart G - Trailing Cables › Section 75.607 - Breaking trailing cable and power cable connections

Current through July 13, 2024
[Statutory Provisions]
Trailing cable and power cable connections to junction
					 boxes shall not be made or broken under load.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.700 - Grounding metallic sheaths, armors, and conduits enclosing power conductors

Current through July 13, 2024
[Statutory Provisions]
All metallic sheaths, armors, and conduits enclosing power
					 conductors shall be electrically continuous throughout and shall be grounded by
					 methods approved by an authorized representative of the
					 Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.700-1 - Approved method of grounding

Current through July 13, 2024
Metallic sheaths, armors and conduits in resistance
					 grounded systems where the enclosed conductors are a part of the system will be
					 approved if a solid connection is made to the neutral conductor; in all other
					 systems, the following methods of grounding will be approved:
(a) A solid connection to a borehole casing
				  having low resistance to earth;
(b)
				  A solid connection to metal waterlines having low resistance to
				  earth;
(c) A solid connection to a
				  grounding conductor, other than the neutral conductor of a resistance grounded
				  system, extending to a low resistance ground field located on the
				  surface;
(d) Any other method of
				  grounding, approved by an authorized representative of the Secretary, which
				  ensures that there is no difference in potential between such metallic
				  enclosures and the earth.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.701 - Grounding metallic frames, casings, and other enclosure of electric equipment

Current through July 13, 2024
[Statutory Provisions]
Metallic frames, casings, and other enclosures of electric
					 equipment that can become "alive" through failure of insulation or by contact
					 with energized parts shall be grounded by methods approved by an authorized
					 representative of the Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.701-1 - Approved method of grounding of equipment receiving power from ungrounded alternating current power systems

Current through July 13, 2024
For purposes of grounding metallic frames, casings and
					 other enclosures of equipment receiving power from ungrounded alternating
					 current power systems, the following methods of grounding will be
					 approved:
(a) A solid connection
				  between the metallic frame, casing, or other metal enclosure and the grounded
				  metallic sheath, armor, or conduit enclosing the power conductor feeding the
				  electrical equipment enclosed;
(b)
				  A solid connection to a borehole casing having low resistance to
				  earth;
(c) A solid connection to
				  metal waterlines having low resistance to earth;
(d) A solid connection to a grounding
				  conductor extending to a low resistance ground field located on the
				  surface;
(e) Any other method of
				  grounding, approved by an authorized representative of the Secretary, which
				  ensures that there is no difference in potential between such metal enclosures
				  and the earth.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.701-2 - Approved method of grounding metallic frames, casing and other enclosure receiving power from single-phase 110-220-volt circuit

Current through July 13, 2024
In instances where single-phase 110-220-volt circuits are
					 used to feed electrical equipment, the only method of grounding that will be
					 approved is the connection of all metallic frames, casings and other enclosures
					 of such equipment to a separate grounding conductor which establishes a
					 continuous connection to a grounded center tap of the
					 transformer.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.701-3 - Approved method of grounding metallic frames, casingand other enclosure of electric equipment receiving power from direct current power system with one polarity grounded

Current through July 13, 2024
For the purpose of grounding metallic frames, casings and
					 enclosures of any electric equipment or device-receiving power from a
					 direct-current power system with one polarity grounded, the following methods
					 of grounding will be approved:
(a) A
				  solid connection to the mine track;
(b) A solid connection to the grounded power
				  conductor of the system;
(c)
				  Silicon diode grounding; however, this method shall be employed only when such
				  devices are installed in accordance with the requirements set forth in
				  paragraph (d) of S 75.703-3; and
(d) Any other method, approved by an
				  authorized representative of the Secretary, which insures that there is no
				  difference in potential between such metal enclosures and the earth.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.701-4 - Grounding wires; capacity of wires

Current through July 13, 2024
Where grounding wires are used to ground metallic sheaths,
					 armors, conduits, frames, casings, and other metallic enclosures, such
					 grounding wires will be approved if:
(a) The cross-sectional area (size) of the
				  grounding wire is at least one-half the cross-sectional area (size) of the
				  power conductor where the power conductor used is No. 6 A.W.G., or
				  larger.
(b) Where the power
				  conductor used is less than No. 6 A.W.G., the cross-sectional area (size) of
				  the grounding wire is equal to the cross-sectional area (size) of the power
				  conductor.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.701-5 - Use of grounding connectors

Current through July 13, 2024
The attachment of grounding wires to a mine track or other
					 grounded power conductor will be approved if separate clamps, suitable for such
					 purpose, are used and installed to provide a solid
					 connection.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.702 - Protection other than grounding

Current through July 13, 2024
[Statutory Provisions]
Methods other than grounding which provide no less
					 effective protection may be permitted by the Secretary or his authorized
					 representative.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.702-1 - Protection other than grounding; approved by an authorized representative of the Secretary

Current through July 13, 2024
Under this subpart no method other than grounding may be
					 used to ensure against a difference in potential between metallic sheaths,
					 armors and conduits, enclosing power conductors and frames, casings and metal
					 enclosures of electric equipment, and the earth, unless approved by an
					 authorized representative of the Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.703 - Grounding off track direct-current machine and the enclosure of related detached components

Current through July 13, 2024
[Statutory Provisions]
The frames of all off track direct-current machines and the
					 enclosures of related detached components shall be effectively grounded, or
					 otherwise maintained at no less safe voltages, by methods approved by an
					 authorized representative of the Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.703-1 - Approved method of grounding

Current through July 13, 2024
In instances where the metal frames both of an off track
					 direct-current machine and of the metal frames of its component parts are
					 grounded to the same grounding medium the requirements of S 75.703 will be
					 met.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.703-2 - Approved grounding mediums

Current through July 13, 2024
For purposes of grounding off track direct-current
					 machines, the following grounding mediums are approved:
(a) The grounded polarity of the
				  direct-current power system feeding such machines; or,
(b) The alternating current grounding medium
				  where such machines are fed by an ungrounded direct-current power system
				  originating in a portable rectifier receiving its power from a section power
				  center. However, when such a medium is used, a separate grounding conductor
				  must be employed.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.703-4 - Other methods of protecting offtrack direct-current equipment; approved by an authorized representative of the Secretary

Current through July 13, 2024
Other methods of maintaining safe voltage by preventing a
					 difference between the frames of offtrack direct-current machines and the earth
					 must be approved by an authorized representative of the
					 Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.704 - Grounding frame of stationary high voltage equipment receiving power from ungrounded delta systems

Current through July 13, 2024
[Statutory Provisions]
The frames of all stationary high-voltage equipment
					 receiving power from ungrounded delta systems shall be grounded by methods
					 approved by an authorized representative of the Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.704-1 - Approved methods of grounding

Current through July 13, 2024
The methods of grounding stated in S 75.701-1 will also be
					 approved with respect to the grounding of frames of high-voltage equipment
					 referred to in S 75.704.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705 - Work on high-voltage lines; deenergizing and grounding

Current through July 13, 2024
[Statutory Provisions]
High-voltage lines, both on the surface and underground,
					 shall be deenergized and grounded before work is performed on them, except that
					 repairs may be permitted, in the case of energized surface high-voltage lines,
					 if such repairs are made by a qualified person in accordance with procedures
					 and safeguards, including, but not limited to, a requirement that the operator
					 of such mine provide, test, and maintain protective devices in making such
					 repairs, to be prescribed by the Secretary prior to March 30,
					 1970.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-1 - Work on high-voltage lines

Current through July 13, 2024
(a) Section
				  75.705
				  specifically prohibits work on energized high-voltage lines
				  underground;
(b) No high-voltage
				  line, either on the surface or underground, shall be regarded as deenergized
				  for the purpose of performing work on it, until it has been determined by a
				  qualified person (as provided in S 75.153) that such high-voltage line has been
				  deenergized and grounded. Such qualified person shall by visual observation (1)
				  determine that the disconnecting devices on the high-voltage circuit are in
				  open position and (2) ensure that each ungrounded conductor of the high-voltage
				  circuit upon which work is to be done is properly connected to the
				  system-grounding medium. In the case of resistance grounded or solid
				  wye-connected systems, the neutral wire is the system-grounding medium. In the
				  case of an ungrounded power system, either the steel armor or conduit enclosing
				  the system or a surface grounding field is a system grounding medium;
(c) No work shall be performed on any
				  high-voltage line on the surface which is supported by any pole or structure
				  which also supports other high-voltage lines until:
(1) All lines supported on the pole or
				  structure are deenergized and grounded in accordance with all of the provisions
				  of this section which apply to the repair of energized surface high-voltage
				  lines; or
(2) the provisions of SS
				  75.705-2 through 75.705-10 have been complied with, with respect to all lines,
				  which are supported on the pole or structure.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-2 - Repair to energized surface high-voltage lines

Current through July 13, 2024
An energized high-voltage surface line may be repaired only
					 when--
(a) The operator has determined
				  that--
(1) Such repairs cannot be scheduled
				  during a period when the power circuit could be properly deenergized and
				  grounded;
(2) Such repairs will be
				  performed on power circuits with a phase-to-phase nominal voltage no greater
				  than 15,000 volts;
(3) Such repairs
				  on circuits with a phase-to-phase nominal voltage of 5,000 volts or more will
				  be performed only with the use of live line tools;
(4) Weather conditions will not interfere
				  with such repairs or expose those persons assigned to such work to an imminent
				  danger; and
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-3 - Work on energized high-voltage surface lines; reporting

Current through July 13, 2024
Any operator designating and assigning qualified persons to
					 perform repairs on energized high-voltage surface lines under the provisions of
					 S 75.705-2 shall maintain a record of such repairs. Such record shall contain a
					 notation of the time, date, location, and general nature of the repairs made,
					 together with a copy of the information filed with the operator by the
					 qualified person designated as responsible for performing such
					 repairs.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-4 - Simultaneou repairs

Current through July 13, 2024
When two or more persons are working on an energized
					 high-voltage surface line simultaneously, and any one of them is within reach
					 of another, such persons shall not be allowed to work on different phases or on
					 equipment with different potentials.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-5 - Installation of protective equipment

Current through July 13, 2024
Before repair work on energized high-voltage surface lines
					 is begun, protective equipment shall be used to cover all bare conductors,
					 ground wires, guys, telephone lines, and other attachments in proximity to the
					 area of planned repairs. Such protective equipment shall be installed from a
					 safe position below the conductors or other apparatus being covered. Each
					 rubber protective device employed in the making of repairs shall have a
					 dielectric strength of 20,000 volts, or more.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-6 - Protective clothing; use and inspection

Current through July 13, 2024
All persons performing work on energized high-voltage
					 surface lines shall wear protective rubber gloves, sleeves, and climber guards
					 if climbers are worn. Protective rubber gloves shall not be worn wrong side out
					 or without protective leather gloves. Protective devices worn by a person
					 assigned to perform repairs on high-voltage surface lines shall be worn
					 continuously from the time he leaves the ground until he returns to the ground,
					 and, if such devices are employed for extended periods, such person shall
					 visually inspect the equipment assigned him for defects before each use and, in
					 no case, less than twice each day.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-7 - Protective equipment; inspection

Current through July 13, 2024
Each person shall visually inspect protective equipment and
					 clothing provided him in connection with work on high-voltage surface lines
					 before using such equipment and clothing, and any equipment or clothing
					 containing any defect or damage shall be discarded and replaced with proper
					 protective equipment or clothing prior to the performance of any electrical
					 work on such lines.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-8 - Protective equipment; testing and storage

Current through July 13, 2024
(a) All rubber
				  protective equipment used on work on energized high-voltage surface lines shall
				  be electrically tested by the operator in accordance with ASTM standards, part
				  28, published February 1968, and such testing shall be conducted in accordance
				  with the following schedule:
(1) Rubber
				  gloves, once each month;
(2) Rubber
				  sleeves, once every 3 months;
(3)
				  Rubber blankets, once every 6 months;
(4) Insulator hoods and line hose, once a
				  year; and
(5) Other electric
				  protective equipment, once a year.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-9 - Operating disconnecting or cutout switches

Current through July 13, 2024
Disconnecting or cutout switches on energized high-voltage
					 surface lines shall be operated only with insulated sticks, fuse tongs, or
					 pullers which are adequately insulated and maintained to protect the operator
					 from the voltage to which he is exposed. When such switches are operated from
					 the ground, the person operating such devices shall wear protective rubber
					 gloves.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-10 - Tying into energized high-voltage surface circuits

Current through July 13, 2024
If the work of forming an additional circuit by tying into
					 an energized high-voltage surface line is performed from the ground, any person
					 performing such work must wear and employ all of the protective equipment and
					 clothing required under the provisions of SS 75.705-5 and 75.705-6. In
					 addition, the insulated stick used by such person must have been designed for
					 such purpose and must be adequately insulated and be maintained to protect such
					 person from the voltage to which he is exposed.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.705-11 - Use of grounded messenger wires; ungrounded systems

Current through July 13, 2024
Solely for purposes of grounding ungrounded high-voltage
					 power systems, grounded messenger wires used to suspend the cables of such
					 systems may be used as a grounding medium.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart H - Grounding › Section 75.706 - Deenergized underground power circuits; idle days-idle shifts

Current through July 13, 2024
[Statutory Provisions]
When not in use, power circuits underground shall be
					 deenergized on idle days and idle shifts, except that rectifiers and
					 transformers may remain energized.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.800 - High-voltage circuits; circuit breakers

Current through July 13, 2024
[Statutory Provisions]
High-voltage circuits entering the underground area of any
					 coal mine shall be protected by suitable circuit breakers of adequate
					 interrupting capacity which are properly tested and maintained as prescribed by
					 the Secretary. Such breakers shall be equipped with devices to provide
					 protection against under-voltage grounded phase, short circuit, and
					 overcurrent.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.800-1 - Circuit breakers; location

Current through July 13, 2024
Circuit breakers protecting high-voltage circuits entering
					 an underground area of any coal mine shall be located on the surface and in no
					 case installed either underground or within a drift.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.800-2 - Approved circuit schemes

Current through July 13, 2024
The following circuit schemes will be regarded as providing
					 the necessary protection to the circuits required by S 75.800:
(a) Ground check relays may be used for
				  undervoltage protection if the relay coils are designed to trip the circuit
				  breaker when line voltage decreases to 40 percent to 60 percent of the nominal
				  line voltage;
(b) Ground trip
				  relays on resistance grounded systems will be acceptable as grounded phase
				  protection;
(c) One circuit breaker
				  may be used to protect two or more branch circuits, if the circuit breaker is
				  adjusted to afford overcurrent protection for the smallest conductor.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.800-3 - Testing, examination and maintenance of circuit breakers; procedures

Current through July 13, 2024
(a) Circuit breakers and their auxiliary
				  devices protecting underground high-voltage circuits shall be tested and
				  examined at least once each month by a person qualified as provided in
				  S75.153;
(b) Tests shall include:
(1) Breaking continuity of the ground check
				  conductor, where ground check monitoring is used; and
(2) Actuating at least two of the auxiliary
				  protective relays.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.800-4 - Testing, examination and maintenance of circuit breakers; record

Current through July 13, 2024
The operator of any coal mine shall maintain a written
					 record of each test, examination, repair, or adjustment of all circuit breakers
					 protecting high voltage circuits which enter any underground area of the coal
					 mine. Such record shall be kept in a book approved by the
					 Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.801 - Grounding resistors

Current through July 13, 2024
[Statutory Provisions]
The grounding resistor, where required, shall be of the
					 proper ohmic value to limit the voltage drop in the grounding circuit external
					 to the resistor to not more than 100 volts under fault conditions. The
					 grounding resistor shall be rated for maximum fault current continuously and
					 insulated from ground for a voltage equal to the phase-to-phase voltage of the
					 system.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.802 - Protection of high-voltage circuit extending underground

Current through July 13, 2024
(a) Except as provided in paragraph (b) of
				  this section, high-voltage circuits extending underground and supplying
				  portable, mobile, or, stationary high-voltage equipment shall contain either a
				  direct or derived neutral which shall be grounded through a suitable resistor
				  at the source transformers, and a grounding circuit, originating at the
				  grounded side of the grounding resistor, shall extend along with the power
				  conductors and serve as a grounding conductor for the frames of all
				  high-voltage equipment supplied power from that circuit.
(b) Notwithstanding the requirements of
				  paragraph (a) of this section, the Secretary or his authorized representative
				  may permit ungrounded high-voltage circuits to be extended underground to feed
				  stationary electric equipment if--
(1) Such
				  circuits are either steel armored or installed in grounded, rigid steel conduit
				  throughout their entire length; or,
(2) The voltage of such circuits is nominally
				  2,400 volts or less phase-to-phase and the cables used in such circuits are
				  equipped with metallic shields around each power conductor, and contain one or
				  more ground conductors having a total cross sectional area of not less than
				  one-half the power conductor; and,
(3) Upon a finding by the Secretary or his
				  authorized representative that the use of the circuits described in paragraphs
				  (b)(1) and (2) of this section does not pose a hazard to the miners.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.803 - Fail safe ground check circuit on high-voltage resistance grounded systems

Current through July 13, 2024
[Statutory Provisions]
On and after September 30, 1970, high-voltage, resistance
					 grounded systems shall include a fail safe ground check circuit to monitor
					 continuously the grounding circuit to assure continuity and the fail safe
					 ground check circuit shall cause the circuit breaker to open when either the
					 ground or pilot check wire is broken, or other no less effective device
					 approved by the Secretary or his authorized representative to assure such
					 continuity, except that an extension of time, not in excess of 12 months, may
					 be permitted by the Secretary on a mine-by-mine basis if he determines that
					 such equipment is not available.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.803-1 - Maximum voltage ground check circuits

Current through July 13, 2024
The maximum voltage used for ground check circuits under
					 S75.803 shall not exceed 96 volts.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.803-2 - Ground check system not employing pilot check wires; approval by the Secretary

Current through July 13, 2024
Ground check systems not employing pilot check wires will
					 be approved only if it is determined that the system includes a fail safe
					 design causing the circuit breaker to open when ground continuity is
					 broken.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.804 - Underground high-voltage cables

Current through July 13, 2024
(a) Underground
				  high-voltage cables used in resistance grounded systems shall be equipped with
				  metallic shields around each power conductor with one or more ground conductors
				  having a total cross sectional area of not less than one-half the power
				  conductor, and with an insulated external conductor not smaller than No. 8
				  (A.W.G.) or an insulated internal ground check conductor not smaller than No.
				  10 (A.W.G.) for the ground continuity check circuit.
(b) All such cables shall be adequate for the
				  intended current and voltage. Splices made in such cables shall provide
				  continuity of all components.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.805 - Couplers

Current through July 13, 2024
[Statutory Provisions]
Couplers that are used with medium-voltage or high-voltage
					 power circuits shall be of the three-phase type with a full metallic shell,
					 except that the Secretary may permit, under such guidelines as he may
					 prescribe, no less effective couplers constructed of materials other than
					 metal. Couplers shall be adequate for the voltage and current expected. All
					 exposed metal on the metallic couplers shall be grounded to the ground
					 conductor in the cable. The coupler shall be constructed so that the ground
					 check continuity conductor shall be broken first and the ground conductors
					 shall be broken last when the coupler is being uncoupled.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.806 - Connection of single-phase loads

Current through July 13, 2024
[Statutory Provisions]
Single-phase loads, such as transformer primaries, shall be
					 connected phase-to-phase.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.807 - Installation of high-voltage transmission cables

Current through July 13, 2024
[Statutory Provisions]
All underground high-voltage transmission cables shall be
					 installed only in regularly inspected air courses and haulageways, and shall be
					 covered, buried, or placed so as to afford protection against damage, guarded
					 where men regularly work or pass under them unless they are 6 1/2 feet or more
					 above the floor or rail, securely anchored, properly insulated, and guarded at
					 ends, and covered, insulated, or placed to prevent contact with trolley wires
					 and other low-voltage circuits.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.808 - Disconnecting devices

Current through July 13, 2024
[Statutory Provisions]
Disconnecting devices shall be installed at the beginning
					 of branch lines in high-voltage circuits and equipped or designed in such a
					 manner that it can be determined by visual observation that the circuit is
					 deenergized when the switches are open.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.809 - Identification of circuit breaker and disconnecting switches

Current through July 13, 2024
[Statutory Provisions]
Circuit breakers and disconnecting switches underground
					 shall be marked for identification.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.810 - High-voltage trailing cables; splices

Current through July 13, 2024
[Statutory Provisions]
In the case of high-voltage cables used as trailing cables,
					 temporary splices shall not be used and all permanent splices shall be made in
					 accordance with S 75.604. Terminations and splices in all other high-voltage
					 cables shall be made in accordance with the manufacturer's
					 specifications.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.811 - High-voltage underground equipment; grounding

Current through July 13, 2024
[Statutory Provisions]
Frames, supporting structures and enclosures of stationary,
					 portable, or mobile underground high-voltage equipment and all high-voltage
					 equipment supplying power to such equipment receiving power from resistance
					 grounded systems shall be effectively grounded to the high-voltage
					 ground.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.812 - Movement of high-voltage power centers and portable transformers; permit

Current through July 13, 2024
[Statutory Provisions]
Power centers and portable transformers shall be
					 deenergized before they are moved from one location to another, except that,
					 when equipment powered by sources other than such centers or transformers is
					 not available, the Secretary may permit such centers and transformers to be
					 moved while energized, if he determines that another equivalent or greater
					 hazard may otherwise be created, and if they are moved under the supervision of
					 a qualified person, and if such centers and transformers are examined prior to
					 such movement by such person and found to be grounded by methods approved by an
					 authorized representative of the Secretary and otherwise protected from hazards
					 to the miner. A record shall be kept of such examinations. High-voltage cables,
					 other than trailing cables, shall not be moved or handled at any time while
					 energized, except that, when such centers and transformers are moved while
					 energized as permitted under this section, energized high-voltage cables
					 attached to such centers and transformers may be moved only by a qualified
					 person and the operator of such mine shall require that such person wear
					 approved and tested insulated wireman's gloves.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.812-1 - Qualified person

Current through July 13, 2024
A person who meets the requirements of S 75.153 is a
					 qualified person within the meaning of S 75.812.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart I - Underground High-Voltage Distribution › Section 75.812-2 - High-voltage power center and transformers; record of examination

Current through July 13, 2024
The operator shall maintain a record of all examinations
					 conducted in accordance with S 75.812. Such record shall be kept in a book
					 approved by the Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.900 - Low- and medium-voltage circuit serving three-phase alternating current equipment; circuit breakers

Current through July 13, 2024
[Statutory Provisions]
Low- and medium-voltage power circuits serving three-phase
					 alternating current equipment shall be protected by suitable circuit breakers
					 of adequate interrupting capacity which are properly tested and maintained as
					 prescribed by the Secretary. Such breakers shall be equipped with devices to
					 provide protection against undervoltage, grounded phase, short circuit, and
					 overcurrent.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.900-1 - Circuit breakers; location

Current through July 13, 2024
Circuit breakers used to protect low-and medium-voltage
					 circuits underground shall be located in areas which are accessible for
					 inspection, examination, and testing, have safe roofs, and are clear of any
					 moving equipment used in haulageways.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.900-2 - Approved circuit schemes

Current through July 13, 2024
The following circuit schemes will be regarded as providing
					 the necessary protection to the circuit required by S 75.900:
(a) Ground check relays may be used for
				  undervoltage protection if the relay coils are designed to trip the circuit
				  breaker when line voltage decreases to 40 to 60 percent of the nominal line
				  voltage.
(b) One undervoltage
				  device installed in the main secondary circuit at the source transformer may be
				  used to provide undervoltage protection for each circuit that receives power
				  from that transformer.
(c) One
				  circuit breaker may be used to protect two or more branch circuits if the
				  circuit breaker is adjusted to afford overcurrent protection for the smallest
				  conductor.
(d) Circuit breakers
				  with shunt trip, series trip or undervoltage release devices may be used if the
				  tripping elements of such devices are selected or adjusted in accordance with
				  the settings listed in the tables of the National Electric Code,
				  1968.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.900-3 - Testing, examination, and maintenance of circuit breakers; procedures

Current through July 13, 2024
Circuit breakers protecting low- and medium-voltage
					 alternating current circuits serving three-phase alternating current equipment
					 and their auxiliary devices shall be tested and examined at least once each
					 month by a person qualified as provided in S 75.153. In performing such tests,
					 actuating any of the circuit breaker auxiliaries or control circuits in any
					 manner which causes the circuit breaker to open, shall be considered a proper
					 test. All components of the circuit breaker and its auxiliary devices shall be
					 visually examined and such repairs or adjustments as are indicated by such
					 tests and examinations shall be carried out immediately.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.900-4 - Testing, examination, and maintenance of circuit breakers; record

Current through July 13, 2024
The operator of any coal mine shall maintain a written
					 record of each test, examination, repair, or adjustment of all circuit breakers
					 protecting low- and medium-voltage circuits serving three-phase alternating
					 current equipment used in the mine. Such record shall be kept in a book
					 approved by the Secretary.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.901 - Protection of low- and medium-voltage three-phase circuits used underground

Current through July 13, 2024
[Statutory Provisions]
(a) Low- and medium-voltage three-phase
				  alternating-current circuits used underground shall contain either a direct or
				  derived neutral which shall be grounded through a suitable resistor at the
				  power center, and a grounding circuit, originating at the grounded side of the
				  grounding resistor, shall extend along with the power conductors and serve as a
				  grounding conductor for the frames of all the electrical equipment supplied
				  power from that circuit, except that the Secretary or his authorized
				  representative may permit ungrounded low- and medium-voltage circuits to be
				  used underground to feed such stationary electrical equipment if such circuits
				  are either steel armored or installed in grounded rigid steel conduit
				  throughout their entire length. The grounding resistor, where required, shall
				  be of the proper ohmic value to limit the ground fault current to 25 amperes.
				  The grounding resistor shall be rated for maximum fault current continuously
				  and insulated from ground for a voltage equal to the phase-to-phase voltage of
				  the system.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.902 - Low- and medium-voltage ground check monitor circuits

Current through July 13, 2024
[Statutory Provisions]
On or before September 30, 1970, low- and medium-voltage
					 resistance grounded systems shall include a fail-safe ground check circuit to
					 monitor continuously the grounding circuit to assure continuity which ground
					 check circuit shall cause the circuit breaker to open when either the ground or
					 pilot check wire is broken, or other no less effective device approved by the
					 Secretary or his authorized representative to assure such continuity, except
					 that an extension of time, not in excess of 12 months, may be permitted by the
					 Secretary on a mine-by-mine basis if he determines that such equipment is not
					 available. Cable couplers shall be constructed so that the ground check
					 continuity conductor shall be broken first and the ground conductors shall be
					 broken last when the coupler is being uncoupled.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.902-1 - Maximum voltage ground check circuits

Current through July 13, 2024
The maximum voltage used for such ground check circuits
					 shall not exceed 40 volts.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.902-2 - Approved ground check system not employing pilot check wires

Current through July 13, 2024
Ground check systems not employing pilot check wires will
					 be approved only if it is determined that the system includes a fail safe
					 design causing the circuit breaker to open when ground continuity is
					 broken.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.902-4 - Attachment of ground conductor and ground check wire to equipment frames; use of separate connections

Current through July 13, 2024
In grounding equipment frames of all stationary, portable
					 or mobile equipment receiving power from resistance grounded systems separate
					 connections shall be used when practicable.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.903 - Disconnecting devices

Current through July 13, 2024
[Statutory Provisions]
Disconnecting devices shall be installed in conjunction
					 with the circuit breaker to provide visual evidence that the power is
					 disconnected.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.904 - Identification of circuit breakers

Current through July 13, 2024
[Statutory Provisions]
Circuit breakers shall be marked for
					 identification.
Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart J - Underground Low- and Medium-Voltage Alternating Current Circuits › Section 75.905 - Connection of single-phase loads

Current through July 13, 2024
[Statutory Provisions]
Single-phase loads shall be connected
					 phase-to-phase.