A. Automatic circuit breaking devices or fuses of the correct type andcapacity shall be installed so as to protect all electric equipment and powercircuits against excessive overload; however, this shall not apply tolocomotives operated regularly on grades exceeding five percent. Wires orother conducting materials shall not be used as a substitute for properlydesigned fuses, and circuit breaking devices shall be maintained in safeoperating condition.
B. An automatic circuit breaker of correct type and capacity shall beinstalled on each resistance grounded circuit used underground. Such circuitbreaker shall be located at the power source and equipped with devices toprovide protection against under-voltage, grounded phase, short circuit andovercurrent.
C. Operating controls, such as switches, starters, and switch buttons, shallbe so installed that they are readily accessible and can be operated withoutdanger of contact with moving or live parts.
D. Disconnecting switches shall be installed underground in all main powercircuits within approximately 500 feet of the bottoms of shafts andboreholes, and at other places where main power circuits enter the mine.
E. Electric equipment and circuits shall be provided with switches or othercontrols of safe design, construction and installation.
F. Insulating mats or other electrically nonconductive material shall be keptin place at each power-control switch and at stationary machinery where shockhazards exist.
G. Circuit breakers, disconnecting devices and switches shall be marked foridentification.
(Code 1950, § 45-82.3; 1954, c. 191; 1966, c. 594, § 45.1-80; 1994, c. 28;1999, c. 256.)
A. Automatic circuit breaking devices or fuses of the correct type andcapacity shall be installed so as to protect all electric equipment and powercircuits against excessive overload; however, this shall not apply tolocomotives operated regularly on grades exceeding five percent. Wires orother conducting materials shall not be used as a substitute for properlydesigned fuses, and circuit breaking devices shall be maintained in safeoperating condition.
B. An automatic circuit breaker of correct type and capacity shall beinstalled on each resistance grounded circuit used underground. Such circuitbreaker shall be located at the power source and equipped with devices toprovide protection against under-voltage, grounded phase, short circuit andovercurrent.
C. Operating controls, such as switches, starters, and switch buttons, shallbe so installed that they are readily accessible and can be operated withoutdanger of contact with moving or live parts.
D. Disconnecting switches shall be installed underground in all main powercircuits within approximately 500 feet of the bottoms of shafts andboreholes, and at other places where main power circuits enter the mine.
E. Electric equipment and circuits shall be provided with switches or othercontrols of safe design, construction and installation.
F. Insulating mats or other electrically nonconductive material shall be keptin place at each power-control switch and at stationary machinery where shockhazards exist.
G. Circuit breakers, disconnecting devices and switches shall be marked foridentification.
(Code 1950, § 45-82.3; 1954, c. 191; 1966, c. 594, § 45.1-80; 1994, c. 28;1999, c. 256.)
A. Automatic circuit breaking devices or fuses of the correct type andcapacity shall be installed so as to protect all electric equipment and powercircuits against excessive overload; however, this shall not apply tolocomotives operated regularly on grades exceeding five percent. Wires orother conducting materials shall not be used as a substitute for properlydesigned fuses, and circuit breaking devices shall be maintained in safeoperating condition.
B. An automatic circuit breaker of correct type and capacity shall beinstalled on each resistance grounded circuit used underground. Such circuitbreaker shall be located at the power source and equipped with devices toprovide protection against under-voltage, grounded phase, short circuit andovercurrent.
C. Operating controls, such as switches, starters, and switch buttons, shallbe so installed that they are readily accessible and can be operated withoutdanger of contact with moving or live parts.
D. Disconnecting switches shall be installed underground in all main powercircuits within approximately 500 feet of the bottoms of shafts andboreholes, and at other places where main power circuits enter the mine.
E. Electric equipment and circuits shall be provided with switches or othercontrols of safe design, construction and installation.
F. Insulating mats or other electrically nonconductive material shall be keptin place at each power-control switch and at stationary machinery where shockhazards exist.
G. Circuit breakers, disconnecting devices and switches shall be marked foridentification.
(Code 1950, § 45-82.3; 1954, c. 191; 1966, c. 594, § 45.1-80; 1994, c. 28;1999, c. 256.)
