Ariz. Admin. Code § R11-1-271 - Use of Explosives and Blasting Agents, General Provisions
A. The handling of
explosives may be performed by the person designated to use explosives or by
other employees under his direct supervision provided that such employees are
at least 18 years of age. Persons who use or handle explosives or detonators
shall be experienced men who understand the hazards involved; trainees shall do
such work only under the supervision of and in the immediate presence of
experienced men. Blasting operations shall be under the direct control of
authorized persons.
B. Containers
of an approved type shall be used for taking detonators and other explosives
from storage magazines to the blasting area.
C. Persons authorized to prepare explosive
charges or conduct blasting operations shall use every reasonable precaution,
including but not limited to warning signals, flags, barricades or blasting
mats to ensure the safety of mine personnel.
D. Due precautions shall be taken to prevent
accidental discharge of electric blasting caps from current induced by radio
transmitters, lightning, dust storms, or other sources of extraneous
electricity. All surface, shaft sinking, and tunneling blasting operations
shall be suspended and persons removed from blasting area during the ominous
approach and progress of an electrical storm, when electric detonators are
used.
E. Empty containers and paper
and fiber packing materials which have previously contained high explosives
shall not be used again for any purpose but shall be destroyed by burning
out-of-doors, and no person shall be nearer than 100 feet after the burning has
started.
F. Explosives, blasting
supplies, or blasting accessories that are obviously deteriorated or damaged
shall be destroyed in a safe manner under the instructions of the explosives or
blasting agent manufacturer or its designated agent.
G. Explosives or blasting supplies shall not
be abandoned. While temporarily unattended, they shall be marked with red flags
or some other suitable means of warning persons.
H. Capped primers shall be made up at the
time of charging and as close to the blasting site as conditions
allow.
I. Fuses shall be cut and
capped in safe, dry locations posted with "No Smoking" signs.
J. Fuse shall not be ignited before the
primer and the entire charge are securely in place.
K. If any part of a blast is connected in
parallel and is to be initiated from powerlines or lighting circuits, the time
of current flow shall be limited to a maximum of 25 milliseconds by
incorporating a control device in the blasting circuit or by interrupting the
circuit with an explosive charge attached to one or both lead lines and
initiated by a zero-delay electric blasting cap.
L. Black blasting powder should not be used
for blasting except when a desired result cannot be obtained with another type
of explosive such as in quarrying certain types of dimension stone.
M. Explosives shall be kept separate from
detonators until charging is started.
N. Electric circuits from the blasting
switches to the blast area shall not be grounded.
O. Lead wires and blasting lines shall not be
strung across power conductors, pipelines, railroad tracks, or within 20 feet
of bare powerlines. They shall be protected from sources of static or other
electrical contact.
Notes
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No prior version found.