OV E rV I E W O F T H E S A F E T Y M O D E L
One way to implement this safety model is to conduct a job hazard analysis (JHA). This involves development of a chart: 1) Column 1, breaking down the job into its separate task or steps; 2) Column 2, evaluating the hazard(s) of each task, and 3) Column 3, developing a control for each hazard. See the example below.
JHA: Changing a Wall Ground Fault Circuit I
Removing the cover
Electric shock from exposed
De-energize by opening circuit breaker or removing fuse
Removing old GFCI
Possible other live wires in opening
Test wires with appropriate voltmeter to ensure all wires are de-energized
Installing new GFCI
Possible connecting wires incorrectly
Check wiring diagrams to ensure proper connections
Replace cover and re-energize
Possible defective GFCI
Use the safety model to recognize, evaluate, and control workplace hazards like those in this picture.