department of consumer and employment protection © 2005 resources safety 1 please read this before...
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1Department of Consumerand Employment Protection © 2005 Resources
Safety
Please read this before using presentation
This presentation is extracted from content presented at the 2005 Mines Safety Roadshow held in October 2005
It is made available for non-commercial use (eg toolbox meetings) subject to the condition that the PowerPoint file is not altered without permission from Resources Safety
Supporting resources, such as brochures and posters, are available from Resources Safety
For resources, information or clarification, please contact:[email protected]
or visitwww.docep.wa.gov.au/ResourcesSafety
3Department of Consumerand Employment Protection © 2005 Resources
Safety
Reporting of electrical accidents
Section 78 of MSIA 1994 requires:
“every electric shock or burn to a person and every dangerous occurrence involving electricity, to be immediately reported to the District Inspector and recorded in the Record Book kept at the mine”
(whether or not an injury or damage has occurred)
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Safety
Investigation of electrical accidents
Regulation 5.11 of MSIR 1995 requires the appointed “Electrical Supervisor” to investigate, record in the electrical log book and report to the manager, details of every: electric shock or burn to a person fire suspected to be caused by electricity dangerous occurrence involving electricity that could have
caused injury to a person
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Safety
Reportable occurrences
0 1000 2000 3000 4000 5000
Breakage of ropeRailways
Presence of gasGas or dust ignition
ExplosivesLight vehicle incidents
Unconsciousness/fumingCranes
Drill/power shovelsFixed plantRock falls
Wall failuresNot categorized
ElectricalTruck/ mobile plant
Outbreak of fire
• Electrical accidents category is ranked 3rd highest
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Safety
Electric shocks incidents 1995 – 2004
134
170 170
237210 219
197 210
262
0
50
100
150
200
250
300
95-96 96-97 97-98 98-99 99-00 00-01 01-02 02-03 03-04
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Safety
Electric shock incidence rates 1995 – 2004
0
100
200
300
0.0
2.0
4.0
6.0
8.0
10.0
Shocks 134 170 170 237 210 219 197 210 262
Incidence 3.62 4.16 4.00 5.87 5.41 5.47 4.80 4.92 5.72
95-96
96-97
97-98
98-99
99-00
00-01
01-02
02-03
03-04
• Incidence rate as shocks per 1,000 employees
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Safety
Electric shock severity
INJURIES2%
SHOCKS98%
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Safety
Factors affecting electric shock severity
Body impedance
Current path through the body
Shock current magnitude
Duration of shock
AC or DC supply
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Safety
Mining electrical fatalities to October 2005
May 2002 C Harris Nickel Seekers (Daisy Milano Mine)
Mar 2001 R Griffiths Meteor Nominees (Meteor Stone Quarry)
Feb 1994 M Baljeu Westralian Sands (North Yoganup)
Mar 1991 W Gatt Poseidon (Karonie mine)
Nov 1988 JS Meharry Hamersley Iron (Dampier)
Feb 1988 M Rayner CSIRO (Exploration)
Apr 1981 AJ Woolridge Hill 50 Gold (Mount Magnet)
Nov 1981 P Tsakisirus Mt Newman Mining (Nelson Point)
Dec 1980 M D Hobart Agnew Mining (Leinster)
11Department of Consumerand Employment Protection © 2005 Resources
Safety
Machinery contact with overhead powerlines
Year Trucks Excavator Drills Cranes Misc. Incidents
1995 7 1 1 2 1 12
1996 1 1 1 2 5
1997 2 6 1 1 10
1998 4 3 2 3 12
1999 2 2 3 1 8
2000 2 2 1 1 6
2001 2 1 3
2002 3 2 2 7
2003 2 2 1 2 7
2004 4 2 2 8
Total 21 23 5 12 12 78
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Safety
Review of 628 shocks in last three years
Occupation
Location
Equipment type
Circuit function
Accident causes
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Safety
Electric shocks by occupation
Electrician15%
Mechanic27%
Operator41%
TA/App7%
Other10%
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Safety
Electric shocks by location
U/G6%
SURFACE94%
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Safety
Electric shocks by equipment type
Portable18%
Transportable22%
Mobile6%
Fixed54%
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Safety
Electric shocks by circuit function
Control Circuits
16%
Pow er Circuits
84%
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Safety
Electric shock causes
Static4%
Defects62%
Work Practices
34%
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Safety
Electric shocks caused by equipment defects
Exposed live parts
19%
Other Faults40%
Ingress of Water41%
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Safety
Electric shocks caused by work practice
Welding contacts
37%
Failure to isolate25%
Live w ork21%
Tank house contacts
17%
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Safety
Opportunities for improvement (many)
Regulatory work in progress to: prohibit unnecessary “live” electrical work extend use of RCD “earth-leakage protection” require use of welding VRDs
RCD = residual current device
VRD = voltage reducing device
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Safety
“Live” electrical work
Energy Safety introducing new regulations that prohibit unnecessary “live” electrical work undertaken by electricians: excludes maintenance testing no “live” work allowed in domestic premises necessary work must be demonstrated and subject to written
work procedures that will assure safety
(7% of mining electric shocks involve “live” work)
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Safety
RCD - Earth-leakage protection
A 30mA RCD will automatically cut off the electricity supply in the event of an electric shock to a person before any harmful effects can occur
Only an RCD will detect water ingress into electrical equipment (41% of defects, 25% of shocks)
Regulation 5.24 of MSIR 1995 currently requires 30mA RCD protection for all portable apparatus at the mine
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Safety
RCD - Earth-leakage protection cont.
18% of shocks involve portable equipment already RCD protected
16% of electric shocks involve lighting circuits that are not currently required to be RCD protected
16% of electric shocks involve control circuits that are not currently required to be RCD protected
(potential to protect against 50% of shocks)
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Safety
RCD - Earth-leakage protection cont.
Proposal:
Require all new lighting circuits to be RCD protected, and upgrade existing circuits within 5 years
Require all new control circuits to be either extra-low voltage
or RCD protected (not practicable to upgrade
existing circuits)
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Welding VRDs
A VRD will not switch on the electricity supply before a genuine attempt is made to strike an arc, and will automatically cut off the power after welding ceases
Welding power will not be established if any person has inadvertently become part of the welding circuit and could receive a shock
(welding shocks constitute 37% of work practice failuresand 12% of all reported shocks)
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Safety
Welding VRDs (voltage reducing devices)
Proposal:
Require all welding power sources exceeding certain minimum open-circuit voltages be provided with VRD technology within 2 years
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Safety
Summary of electric shock incidents
Electric shocks are 3rd highest reportable incident
There is an electrocution every 2-3 years (the last was in May 2002)
Shocks to operators 41%, mechanics 27%, electricians 15%
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Summary of electric shock causes
62% of shocks are due to equipment defects and 34% due to inadequate work practices
Major equipment defects: ingress of water 41% exposed “live” parts due to damage 19%
Major work practice defects: welding contacts 37% failure to isolate 25% “live” electrical work 21%
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Summary of future regulation
Proposed “live” work regulations could eliminate 7% of all shocks
Proposed VRD regulations could eliminate 12% of all shocks
Proposed RCD regulations could safeguard 50% of the remaining shocks that occur