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Ground Fault Circuit Interrupters (GFCI)
Many commercial and residential establishments use Ground Fault Circuit Interrupters (GFCI's) to prevent electrical shock. The way GFCI's work is by sensing when current traveling through the hot conductor is not returning via the neutral conductor. This prevents humans from... Read more
Avoiding Unplanned Air Changes
Many mine explosions result from a major interruption of the mine ventilation system. One such interruption can be safely controlled by employing sound mining and engineering practices. When mining into an unregulated air course or into an air course controlled... Read more
Transformer Primary Protection Fails To Isolate Fault
What A plant operator received a severe electric shock as he was working to replace the lid on a cable pit. The cable pit housed consumers mains running from the supply transformer to the main switch-room, some 56m away. After removing... Read more
Minerals Industry Safety Handbook Part 5 : Equipment and Machinery
This chapter of the Minerals Industry Safety Handbook covers the mine site hazards associated with machinery. Sections in this chapter cover hazards and where they may occur (confined spaces, elevated platforms etc.), hazardous plant (pressure vessels, guarding of moving parts),... Read more
Free Station survey control system
Problem Underground mining surveying operations can often place personnel in unsafe locations when locating control points Solution A survey control system, accessible from floor level, that provides a safer working environment for surveyors and general mine workers, improves productivity and saves costs in... Read more
High voltage plugs and adaptors
Problem Previous style of cable plugs and adapters were prone to failure in service posing a potential hazard to personnel Solution A completely new design for high voltage cable plugs and adaptors (in the range of 6,600-25,000 volts) subsequent to research into causes... Read more
Is Your Belt Slippage Protection Working?
In recent years several conveyor belt fires have been caused by belt slippage. To prevent conveyor belt fires, a belt slippage detection system should be provided to stop the conveyor drive automatically when belt slippage occurs. ; Most conveyor slip... Read more
(UNDERGROUND COAL MINE) FATAL MACHINERY ACCIDENT WHITES BRANCH, PINE RIDGE COAL COMPANY GORDON, BOONE COUNTY, WEST VIRGINIA
What A 50 year old, continuous mining machine operator, with 22 years experience, received fatal crushing injuries when he was caught between the tail boom of the continuous miner and the coal rib. Why The accident was caused by a confluence of factors... Read more
SURFACE AREA OF UNDERGROUND COAL MINE FATAL EXPLODING PRESSURE VESSEL ACCIDENT at Island Creek Coal Company VP 8 Mavisdale, Buchanan
What A clean coal filter drain pump exploded due to steam build up within the pump, inflicting fatal injuries to the operator at a preparation plant of an underground mine. The victim was standing approximately 8 feet away at the on/off... Read more
Electrical switchgear and safety: A concise guide for users
guidance on the managing of three-phase electrical switchgear with voltage ratings from 1000-33 000 volts alternating current (ac). It covers selection, use, care and maintenance. The equipment covered includes switchgear using oil, air, sulphur hexafluoride or vacuum as the interrupting... Read more
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