6 December 2006
Including change 1, 7 December 2006
ENERGY CONTROL (LOCKOUT/TAGOUT)
SAFE CLEARANCE AND LOCKOUT/TAGOUT PROCEDURES. The basic
safety rule governing safe clearance and lockout/tagout procedures is that all
conductors and equipment are considered energized until all sources of electrical
energy have been disconnected or otherwise prevented from energizing the equipment
or circuits being worked on. Even with safe clearance and lockout/tagout procedures
applied, all lines and apparatus must be grounded with approved grounding methods
and tested for no voltage. This will reduce the voltage across the worker to the lowest
practical value possible, in case the line or equipment being worked on is accidentally
energized. Table 6-1 summarizes the sequence of events associated with lockout and
tagout. As part of safe working practices, the lockout/tagout process requires a circuit
be deenergized, tested dead, isolated, tested dead, locked out, tagged, and grounded.
Table 6-1. Lockout/Tagout Sequence
Steps to Deenergize a Circuit
Notify all affected workers of hazards, their control, and any possible
Prior to shutdown, check voltage to insure test meters are working
properly and that phase rotation will be correct once it is re-energized.
Shut down the system by isolation of energy sources. System is made
Secure all energy source shutdown methods by lockout/tagout/tryout of
controls. Tryout refers to verification of successful lockout/tagout.
Release any stored energy and verify such release.
Verify by testing that the system is deenergized (no voltage).
Provide temporary grounding.
Test meter on known source to ensure testing meters are working
Steps to Reenergize a Circuit
Inspect the work area for an operationally intact system and remove
Notify all affected workers that system will be reenergized and warn
them to stand clear.
Remove temporary grounding.
Remove lockout/tagout/tryout devices.
Visually determine that all affected workers are clear of the circuit.
Check voltage and phasing before re-energizing system.
Proceed with restoring service.