MARVIN MANDEL, Governor                                      951

ELECTRICALLY CONTINUOUS TO AFFORD A CONDUCTOR PATH FOR
THE GROUND CIRCUIT. ANY METALLIC FRAME, CASING, OR
OTHER ELECTRIC EQUIPMENT WHICH CAN BECOME "ALIVE"
THROUGH FAILURE OF INSULATION OR BY CONTACT WITH AN
ENERGIZED PART SHALL BE GROUNDED EFFECTIVELY. CASINGS
OF TRANSFORMERS SHALL BE GROUNDED EFFECTIVELY UNLESS
PROTECTED BY INSULATION. MINING EQUIPMENT MOUNTED ON
RUBBER TIRES OR CATERPILLAR TREADS, RECEIVING POWER
THROUGH A TRAILING CABLE SHALL BE GROUNDED
EFFECTIVELY.

REVISOR'S NOTE: This section presently appears as
Article 66C, section 588 of the Code. The
phrase "purchased after June 1, 1949", is
proposed for deletion as obsolete. The
only other changes made are in style.

7-437. CIRCUIT BREAKERS AND SWITCHES.

(A)      INSTALLATION.---A FUSE OR ANY OTHER

EQUIVALENT PROTECTIVE DEVICE OF THE CORRECT TYPE AND
CAPACITY SHALL BE INSTALLED ON ELECTRIC EQUIPMENT TO
PROTECT AGAINST EXCESSIVE OVERLOAD. WIRE OR OTHER
CONDUCTING MATERIAL MAY NOT BE USED AS A SUBSTITUTE
FOR A PROPERLY DESIGNED FUSE. EVERY CIRCUIT BREAKER
SHALL BE MAINTAINED IN PROPER OPERATING CONDITION AND
ADJUSTED SO EQUIPMENT CANNOT BE OVERLOADED. EVERY
SWITCH OR CIRCUIT BREAKER SHALL BE INSTALLED SO IT IS
ACCESSIBLE READILY AND CAN BE OPERATED WITHOUT DANGER
OF CONTACT WITH MOVING OR LIVE PARTS.

REVISOR'S NOTE: This subsection presently appears
as Article 66C, section 589 (a) of the
Code. The only changes made are in style.

(B)             DISCONNECTION;                          UNDERGROUND
EQUIPMENT.—DISCONNECTING SWITCHES SHALL BE INSTALLED
IN EACH MAIN POWER CIRCUIT AT THE BOTTOM OF THE SHAFT,
BORE HOLE, OR ANY OTHER PLACE WHERE A MAIN POWER
CIRCUIT ENTERS THE MINE. UNDERGROUND ELECTRIC
EQUIPMENT AND CIRCUITS SHALL BE PROVIDED WITH SWITCHES
OR OTHER CONTROLS OF SAFE DESIGN AND CONSTRUCTION.
THEY SHALL BE INSTALLED IN A SAFE MANNER.

REVISOR'S NOTE: This subsection presently appears
as Article 66C, section 589(b) of the Code.
The only changes made are in style.

(C)    PROTECTION OF CIRCUIT.—A POWER CIRCUIT
SHALL BE PROTECTED AGAINST SHORT CIRCUIT OR EXCESSIVE
OVERLOAD. WIRE OR OTHER CONDUCTING MATERIAL MAY NOT