Temporary signs that have preprinted instructions and markings used to restrict operation or other action so that personnel and/or systems and components are protected, warn that the system or component is in a condition for test or maintenance activities, or is not under the jurisdiction of the operating agent (generally, Load Dispatchers or Operators).
Accident Prevention Tags (APT)
Serve as a visual reminder, as well as a physical obstacle to the Operator or other person that the CB should not be operated.
Blocking Caps
What systems and/or components requiring tagging
• Electrical equipment and circuits designed for operation in excess of 50 volts
• Vessels, piping, and other equipment designed for operation in excess of 15 psig, or 130°F, or contain hazardous material.
• Any system or component that the facility Superintendent
determines needs tagging.
• If work or tests are going to be performed on a system or
component while it is still in operation and precautions have to be taken to ensure personnel safety or to protect the equipment, then tags must be placed in appropriate locations to ensure those precautions.
• Aqueducts, penstocks, and tanks
True/False
APTs do not indicate the status of any equipment, nor do they mean that the equipment or circuit is safe to work on or safe to touch.
True
True/False
H is not a letter used on APTs
True
True/False
The Load Dispatcher issues a tag number only when switching is done in more than one jurisdiction
True
Operators generate APT numbers for, but not limited to, the
following:
- Station buses
- Station transformers
- Station circuit breakers
- Feeder position equipment
- OKs TO parallel and separate feeders
- OKs TO Work Hot with a Hold on 4.8kV feeders
Load Dispatchers generate APT numbers for, but not limited to,
the following:
- 4.8kV feeders (except as noted above)
- 34.5kV circuits into a Substation
- Transmission lines
- Inter-utility Tie Lines
- Transformers with more than one area of jurisdiction
- OKs TO Work Hot with a Hold on 34.5kV circuits
- OKs TO Work Hot with a Hold on Transmission circuits
When System Equipment is Not Entirely Within the Substation
Tagging is done by Operators in Substations, but the APT number
is assigned by the Load Dispatcher.
True/False
A device can only have more than one tag when that device is a
common boundary (overlap point) of different systems or components being isolated or prepared for work
True
True/False
Area Superintendents and Assistant Area Superintendents
have the authority to allow other persons to remove APTs. When this is done, the Operator must be notified.
True
True/False
The Designated Local Dispatcher may direct any Authorized Person to remove these tags