At all times when mining equipment is being used it shall be maintained in what fashion?
Safe working order
100
Electrical equipment and circuits shall be examined and tested in a suitable manner to ensure safe working order. Who can legally do the testing?
Certified Electrician
100
Combustible materials grease, lubricants or flammable liquids shall not be allowed to accumulate in what areas?
Where they can create a fire hazard
100
All electrical equipment utilized in intake airways outby the last open crosscut shall be maintained in safe operating condition and in accordance with whose instructions?
The manufacturer
100
No person shall be placed in charge of electrical face equipment unless he is a qualified person capable of determining the safety of the roof and ribs and capable of detecting the presence of what?
Explosive gas
200
No electric equipment shall be brought inby the last breakthrough next to the working face until the equipment operator or some other competent person authorized by the mine foreman has made an inspection for what?
Explosive gas
200
While electrical equipment is operating at the face, an examination for methane must be made at intervals not to exceed what?
20 minutes
200
Power must be deenergized from the equipment when methance is found in excess of what percent?
When may the power be reenergized?
one percent
Power may be reenergized when the gas is reduced to less than one percent and the place determined safe by a foreman
200
Except in case of an emergency there shall be no cutting or welding at what location?
Inby the last open break
200
Circuits shall be protected against excessive overloads by what type of fuses or circuit breakers?
Correct type and capacity
300
At a minimum power lines and telephone circuits shall be provided with switches or other controls. Such switches or controls shall be of what type of design and construction?
How shall the switches or controlls be installed?
Approved design and construction
Installed properly
300
Individual overload or short circuit protection shall be provided for the trailing cables of what type of equipment?
Mobile
300
What type of current carrying capacity shall power wires and cable have?
Power wires and cables shall be protected from what type of damage?
Adequate capacity protected from mechanical damage
300
Equipment shall not run over trailing cables unless the cables are what?
Properly bridged or otherwise protected
300
Distribution boxes shall be provided with what type of switches?
disconnect
400
Trailing cable and power cable connections shall not be made or broken under what condition?
While under load
400
What shall be insulated adequately where they pass into or out of electric compartments?
power wires and cables
400
Power wires and cables which present a fire hazard shall be well installed on what?
acceptable insulators
400
Where metallic tools or equipment can come in contace with bare power lines, the lines shall be guarded or what?
de-energized
400
What shall telephone an dlow potential signal wires be protected from contacting?
Energized power lines
500
High potential transmission cables shall be covered, insulated, or placed to prevent contact with low potential circuits in accordance with what standards?
Acceptible electric codes
500
What are the requirements for splices in power cables?
a. mechanically strong with adequate electric conductivity
b. effectively insulated and sealed to exclude moisture
c. provided with mechanical protection and electrical conductivity as near as practical to that of the original
500
When may shovel trailing cables be moved with the shovel dipper?
When cable slings or sleds are used
500
Energized high potential cables shall be handled with what type of devices?
Insulated hooks or insulated tongs
500
Before work is done on electrical equipment, the proper switches must be opened and tagged by whom?