On completion of this module you will be able to
- Identify the hazards associated with energized electrical equipment
- Outline the steps of the lockout and tagout procedure
- Identify the personal protective equipment required for each arc flash category
- Identify the reporting window for an electrical incident
- Outline the requirements of an energized work permit
Effects of electrical current on the body
The severity of an electric shock depends on the amount of current, the path it takes
through the body, and how long the contact lasts. The table below shows typical effects
of a 60 Hz alternating current passing through the trunk.
0.5 mAThreshold of perception. A slight tingle.
10 mAMuscular contraction. The person may be unable to let go.
30 mARespiratory paralysis. Breathing may stop.
75 mAVentricular fibrillation is likely. Often fatal without defibrillation.
Always treat a circuit as energized until it has been tested and proven dead. Lockout
and tagout must be applied before any work begins on equipment that could be
re-energized. Report any electrical incident to your supervisor.