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18.
Risk Asssessment Documentation.
Work Activity:
Electrical fault finding/testing within the packaged unit
During commissioning, service and maintenance
Site / Location:
On site location
Y/N
Y
Y
N
Those at Risk:
Contractors:
Other Workers:
General Public
Comments:
Comments - enter names or general groups
Service and Maintenance Contractors and Assistants
On-site maintenance personnel
All circuits to be worked on will be treated as live until verified dead. There are no exceptions to this requirement; experience of employees is irrelevant.
HAZARDS
Because of the complexity of the refrigeration package control circuits, it will occasionally be necessary to cary out "live' testing/fault finding. This assessment addresses the hazards
associated with such work. "Live" testing/fault finding is to be carried out by a trained, competent, authorised person.
In general, each plant contains control circuitry at 240 Volts and power circuits at 415 Volts 3 Phase
The following hazards have been identified:
1. Electric shock from power circuitry
2. Electric shock from 240 Volt control circuitry
3. Eye injury (from an electric arc)
4. Burn injury
5. Injury to third party (Maintenance Personnel)
Control Measures (existing or planned)
Details
Control
PPE:
Equipment:
Information, Instruction and
Training:
Control
Supervision:
Environment:
Procedures, documents etc:
Communications:
Emergency action/procedures:
Access:
62
For Live Testing:
1. Rubber soled shoes or boots
2. Rubber mats
3. Safety glasses
4. Suitable work wear overalls
For work on dead systems:
1. Padlock (for lock-off isolator)
1. General hand tools (insulated)
2. Electrical test equipment eg. Clamp amp meter, multi-meter, test lamp etc. Insulated fused and with calibration.
3. Warning notices
4. Suitable means of cordoning-off the work area eg. red and white bunting
1. Isolate (by removing fuses) power circuits within a panel before fault finding
2. Prove your test instrument prior to and immediately after testing for "dead"
3. Test for "dead' power circuits with exposed conductors
4. Fault find power circuits in the "dead' condition
5. The 240 Volt control circuit may be kept live for fault finding purposes providing that there is no reasonable way of doing the work "dead"
and that all control measures are followed
6. When live testing ensure that a current wiring diagram is available and followed
7. Familiarise yourself with all safety and operating controls such as pressure switches, oil differential switches, motor starters etc.
8. Isolate or discharge power factor correction capacitors before primary circuit work (if installed)
Details
1.
1.
Two person team required whilst live testing is being carried out; keep other persons away from the work area
Maintain a 1m clear space around the work area
2.
1.
2.
1.
Rubber mats should be placed around package, ensure that eses do not pose a trip hazard
Follow site safety rules
Lock individual panel doors
Inform the site manager when isolating panels as this may mean safety circuits are being isolated. Inform second person (if applicable)
of emergency actions.
Switch off and isolate supply
Remove injured person(s) from danger area (if without risk)
Call emergency services
The normal site rules restrict access to the panel room to authorised maintenance personnel who are all familiar with electrical safety
1.
2.
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BAO-104-1 AUS