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2020 MSHA Electrical Annual Refresher

Across
The potential on bare signal wires accessible to contact by __________ shall not exceed 48 volts.
Electric equipment and circuits shall be provided with __________ or other controls.
Inspection and cover plates on electrical equipment and __________ boxes shall be kept in place at all times except during testing or repairs.
Overhead high-potential powerlines shall be installed as specified by the __________ Electrical Code.
When a potentially dangerous condition is found it shall be corrected before equipment or wiring is __________.
Areas containing major electrical installations shall be entered only by __________ persons.
Lamp sockets shall be of a __________ type where they are exposed to weather or wet conditions.
Continuity and resistance of grounding systems shall be tested immediately after installation, repair, modification and __________ thereafter.
Portable extension lights and other lights that by their location present a shock or burn hazard shall be __________.
Distribution __________ shall be provided with a disconnecting device for each branch circuit.
Electrical conductors shall be of a sufficient size and current-carrying capacity to ensure that a rise in temperature resulting from __________ operations will not damage the insulating materials.
Telephone or signal __________ shall not be installed on the same cross arm with power conductors.
Suitable __________ signs shall be posted at all major electrical installations.
Down
Powerlines and telephone circuits shall be protected against __________ circuits and lightning.
Where access is necessary, __________ clearance shall be provided at stationary electrical equipment or switchgear.
Powerlines shall be well separated or __________ from waterlines, telephone lines and air lines.
Electrically powered equipment shall be __________ before mechanical work is done on such equipment.
Circuits shall be protected against excessive__________ by fuses or circuit breakers.
Fuses shall not be removed or replaced by __________ in an energized circuit.
All metal enclosing or encasing electrical circuits shall be __________ or provided with equivalent protection.
Power switches shall be __________ to show which units they control unless identification can be made readily by location.
Switches and starting boxes shall be of safe design and __________.
Transformer enclosures shall be kept __________ against unauthorized entry.
When insulated wires, other than cables, pass through __________ frames, the holes shall be substantially bushed with insulated bushings.