3264 ARTICLE 89

volts shall be known as "low voltage" systems. All such systems wherein
the voltage exceeds 300 volts but the maximum whereof cannot exceed
650 volts shall be known as "medium voltage" systems. All such systems
wherein the voltage can exceed 650 volts shall be known as "high voltage"

systems.

An. Code, 1924, sec. 112. 1922, ch. 307, sec. 111.

112. Every six months the operator of every coal mine in which any
electric system exists shall make an "electric system map" of such mine,
which shall show by distinguishing colors and signs upon a good exact
reproduction of the map of such mine as hereinbefore required to be made,
as the same has been extended to date, such electric system, in such detail
as may be prescribed by the Bureau. Identical cppies of such electric sys-
tem map shall be kept in the office of the foreman at such mine and filed
with the district mine inspector for his official use.

An. Code, 1924, sec. 113. 1922, ch. 307, sec. 112.

113. At every mine where electricity is used for power, there shall be
employed a competent mine electrician who shall have full charge of the
electric apparatus and system in and about such mine, but who shall be
subject to the authority of the official in charge of such mine.

An. Code, 1924, sec. 114. 1922, ch. 307, sec. 113.

114. All electric apparatus shall be of approved type, strongly de-
signed and constructed and of ample capacity for the purpose intended or
to which it may be put; all parts carrying electric current shall be ef-
fectually insulated against the conditions of such intended service; and
the installation thereof shall be so protected that hazards to life and prop-
erty may be minimized.

An. Code, 1924, sec. 115. 1922, ch. 307, sec. 114.

115. Ample and well-constructed switches and other protective devices
shall be provided upon all circuits, and especially upon branch circuits,
which shall be protected against electrical leakage and extraneous damage,
and all switches so devised that accidental closing or interference by un-
authorized persons may be prevented or forestalled; and in all circuits
where the load may suddenly approach or exceed the safe capacity of the
circuit or apparatus, circuit interrupting devices shall be installed.

An. Code, 1924, sec. 116. 1922, ch. 307, sec. 115.

116. Electric current of high voltage may be transmitted underground
only when the circuit is carried inside metallic sheaths or armor, such
sheaths or armor to be permanently grounded; and such current may be
applied only to transformers or motors in which the high voltage windings
are a part of the stationary element thereof.

An. Code, 1924, sec. 117. 1922, ch. 307, sec. 116.

117. Explosives shall not be hauled or transported in the vicinity of
live electric apparatus or circuits unless such explosives are placed in an
insulated, covered box; nor placed upon an electric locomotive at any time;
nor temporarily placed nor stored near electric currents or equipment;