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98Contact With Live 415 Volt Conductors



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Brief Description of Incident/Accident & Description of Consequences/Outcomes:

INCIDENT

During plant maintenance a contractor supervising electrician picked up a five-wire (3 phases, earth and neutral) double insulated cable lying loose in a wet oily cable tray. When wiping the cable with his bare hand, the loose tape around the exposed conductors at the cable end came off and he received a shock. The 415 Volt conductors shorted out and the power tripped off on short circuit.

Identified Root Causes:

INVESTIGATION

While the plant was operating, the following protection was not in service or was inadequate.

· No general 415 Volt earth leakage (mains supply).

· No cable identification.

· Redundant cable and apparatus were not safely isolated.

· Inadequate protection – where the schematic diagram indicated a 10A circuit breaker, the actual circuit breaker was 32A.

· Inadequate available drawings – where drawings indicated two motors in parallel, there were actually four.

· Inadequate management of contract personnel – the electrical contractor was not aware of the site Electrical Management Handbook.

Energy Type(s) Involved:

Direct contact with live electrical conductors

Equipment Type(s):

Electrical Cable

Root & Contributing Cause(s):

LTA awareness

LTA hazard identification

LTA isolation

LTA work method

Stated or Potential Consequence(s):

Potential Fatality

Preventative/Recommended/Accepted Steps of Risk Mitigation, Points of Interest:

PRELIMINARY RECOMMENDATIONS

· Mines should review their electrical systems and contractor control in line with “Guidelines for Safe Mining”, the Mines Inspection Act and the General Rule.

· The review should immediately ensure that all earth leakage systems are in service and operational, and that all redundant cables and apparatus are safe.

Organisation:

New South Wales Department of Primary Industries, Minerals and Petroleum


Results

Here are the results.


Information

Reference Type:

Mine Safety Report #SA99-08

Mine Type:

Any Mine Type

Energy:

Electrical

Published:

1999

Region:

Australia, New South Wales

ICAM Categories

Organisational Factors

• LTA contract management

Task or Environmental Conditions

-

Individual or Team Actions

• LTA hazard identification

• LTA isolation

• LTA work method

Failed or Absent Defences

-



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