Safety, Hazard Identification, and Risk Assessment
Core concepts
Understand arc flash and shock hazards, approach boundaries, lockout/tagout, personal protective equipment selection, test-before-touch, and the use of properly rated test instruments. Identify common hazards: exposed live parts, missing enclosures, damaged insulation, improper temporary wiring, blocked working space, inadequate illumination, and unguarded openings in equipment. Perform risk assessment by considering likelihood and severity, then apply the hierarchy of controls: eliminate, substitute, engineer, administrate, and finally rely on PPE.
Traps in questions
- Treating voltage as the only risk factor; available energy and arc flash matter as much as shock voltage.
- Assuming a de-energized circuit is safe without verification and lockout.
- Selecting PPE by habit rather than by the assessed incident energy or task category.
- Overlooking working-space and access requirements as safety issues rather than housekeeping.
- Ignoring that energized work requires justification and authorization, not just caution.
Worked example
An inspector must verify terminations in a live 480 V panel. The correct sequence is to determine whether the task can be done de-energized, obtain authorization if not, establish boundaries, don the required arc-rated PPE, use a meter rated for the available fault current, and work with a second person present. Rule of thumb: if the task can be deferred to a de-energized state, it must be.
Practical link to inspection
Inspectors are exposed to the hazards they evaluate. Declining unsafe access is a professional duty, not an obstruction.