Clearances, OKs TO, and Diagnostic Test Authorizations (DTAs)
A permits the performance of specified work on specified circuits
Work Authorities are required when any of the following apply
When a worker needs to be protected from hazardous energy in order to perform
When the crew supervisor, Field Representative, Facility Operations Manager,
or Superintendent-level supervisor deems a Work Authority is necessary
When work may affect the reliability, capacity, capability, availability, or
response rate of the Power System or any component of System Equipment
A on any circuit requires that it be Disconnected from specified sources of hazardous energy (usually electrical), and remain Disconnected until the Clearance is released, or turned in
A Clearance may originate from any Issuing Authority.
When used to describe the preparation of electrical circuits for a Work Authority, means that an open, usually one that is visible, exists between specified sources of electrical energy and the circuit that is being prepared for work. Sources of visible disconnection include
A Clearance is required when it is necessary to enter within the MAD of a circuit that is normally energized above 600-V.