Working On or Near Electrical Conductors or Circuit Parts
The specific safety-related work practice shall be consistent with the nature and extent of the associated electric hazards.
Live parts to which an employee might be exposed shall be put into an electrically safe work condition before an employee works on or near them, unless the employer can demonstrate that de-energizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitation.
An electrically safe work condition shall be achieved when performed in accordance with the procedures and verified by the following process:-
- Determine all possible sources of electrical supply to the specific equipment. Check applicable up-to-date drawings,diagrams, and identification tags
- After properly interrupting the load current, open the disconnecting device(s) for each source
- Where it is possible, visually verify that all blades of the disconnecting devices are fully open or that draw out type circuit breakers are withdrawn to the fully disconnected position.
- Apply lockout/tag out devices in accordance with a documented and established policy.
- Use an adequately rated voltage detector to test each phase conductor or circuit part to verify they are de-energized.Before and after each test, determine that the voltage detector is operating satisfactorily
- Where the possibility of induced voltages or stored electrical energy exists, ground the phase conductors or circuit parts before touching them. Where it could be reasonably anticipated that the conductors or circuit parts being de-energized could contact other exposed energized conductors or circuit parts, apply ground connecting devices rated for the available fault duty.