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Investigation of ampacity derating factors for shuttle cars using fiber optics technology.

Authors
Kovalchik-PG; Scott-LW; Duda-FT; Dubaniewicz-TH
Source
IEEE Industry Applications Society 32nd Annual Meeting, 1997 Oct, P. A. Lindsay, ed., New Orleans, Louisiana :1-4
Link
NIOSHTIC No.
20000111
Abstract
Overheating of electric cables on shuttle cars has long been recognized as a cause of premature insulation failure leading to shock and electrocution. Use of cable reels on shuttle cars can cause excessive heat build up which, in turn, causes the cable insulation to soften and become easily damaged. This heat-softened insulation reduces the life of the cable. Repeated cycling of a cable in this manner can cause premature aging of the insulation; it becomes brittle, cracks and allows electrical leakage paths to form. These leakage paths provide the opportunity for shock and electrocution to occur if miners come in contact with the damaged section of cable. It is imperative that cable operating temperatures be maintained at safe thermal limits. This paper discusses a research project conducted by the National Institute for Occupational Safety and Health, Pittsburgh Research Center to determine dynamically the conductor temperature of reeled shuttle car cables using fiber optics technology. The research portrays typical shuttle car loading cycles (both current and time cycles). Root-mean-square current loading is calculated based on the results. The thrust of this effort it to provide the scientific basis for ampacity derating factors specifically for mine machinery using reeled cables. This information will reduce the probability of electrical hazards from reeled cables.
Keywords
Mining-industry; Mining-equipment; Mine-safety; Underground-mining; Control-technology; Electrical-insulation; Electrical-shock; Electrical-hazards;
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Publication Date
19971001
Document Type
Conference/Symposia Proceedings
Email Address
pdk0@cdc.gov
Editors
Lindsay-PA;
Fiscal Year
1998
NTIS Accession No.
NTIS Price
ISBN No.
0780346071
NIOSH Division
PRL;
Priority Area
Other Occupational Concerns;
Source Name
IEEE Industry Applications Society 32nd Annual Meeting
State
PA;
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