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Effect of ultralow frequency signaling on blasting array current.

Authors
Hjelmstad-KE; Griffin-RE
Source
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9479, 1993 Jan; :1-11
Link
NIOSHTIC No.
10004318
Abstract
The U.S. Bureau of Mines (USBM) has developed an electromagnetic (EM) fire warning alarm system for underground mines. The system generates a magnetic field for through-the-earth signal transmission to microreceivers carried by individual miners. EM fields can induce electric currents in metallic conductors; if an EM transmitting antenna and an electric blasting cap array are too close, the field could induce a current in the blasting array and cause zn unintentional initiation of the electric detonators. The USBM conducted tests that define the safe and unsafe regions for using electric detonators near the transmitting antenna of the warning alarm system.
Keywords
Electromagnetic-radiation; Antenna-arrays; Human-factors-engineering; Safety-engineering; Ignition; Explosions; Blasting; Caps-explosives; Detonators; Electric-ignition; Mine-fires; Underground-mining; Warning-systems
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB94-112414
NTIS Price
A03
Identifying No.
RI-9479
NIOSH Division
TCRC
Source Name
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9479
State
MN
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