The Definition of Clearance is: A verbal notice from a Tacoma Power Dispatcher to a Qualified employee stating that a line or piece of equipment is considered what?
Killed cleared and tagged under stated conditions.
Safe to test for dead and install shorts and grounds.
The control for that line or equipment has been turned over to the employee receiving the clearance.
Definition of a Clearance limit?
A visible air break or physical separation from a known source of electrical potential that has been Red Clearance tagged for a Qualified employee.
Definition of a Qualified employee?
A person familiar with the construction of and or operation of lines or equipment that concern their position.
Fully aware of the hazards associated therewith.
Or, one who has passed a journey status examination of the electrical trades with which they may be connected.
Definition of a Visible Air Break?
A secured opening in a circuit that can be readily seen; to include air break switches, fused cutouts, and manually operated disconnect switches.
What is the responsibility of the System Dispatcher?
Identify themself to the crew.
Obtain the names of the person(s) requesting clearance(s)
Assure themself that each person is qualified to receive such a clearance and is fully aware of the limits of the clearance.
Ensure that all switching communications are repeated back to the dispatcher word for word.
Issue and release clearances on Tacoma Power electrical lines and equipment over 600 volts.
What is the responsibility of the Switch Person?
To perform all switching and tagging as directed and in the sequence given by the dispatcher.
Identify themselves to the dispatcher by name, radio call number, and location.
Ensure the clearance tags are properly filled out and placed.
Provide for their own personal safety.
What is the responsibility of the Clearance Holder?
Plan for their clearance.
Provide the dispatcher with adequate information about the scope of work and clearance limits needed.
Contact and inform customers affected by clearance and make necessary arrangements.
Perform switching and tagging, in some cases.
Obtain name of dispatcher issuing the clearance.
Repeat all communications back to dispatcher word for word.
Provide for the safety of the crew.
General rules for switching and tagging:
Complex switching situations or operations shall be discussed with the Dispatcher before hand.
Switching orders involving OH, URD, and UG systems shall be conducted over normal radio channels whenever possible.
Scheduled outages will be discussed with the Dispatcher at least 1 hour prior to switching to allow the Dispatcher time to prepare a Job and Outage Report.
After all switching and tagging for a clearance has been performed and a clearance issued, the lines or equipment shall be tested to ensure they are de energized.
The proper placement of Red Clearance Tags include:
The switch handle of a gang operated switch.
Each phase of lifted and parked load break elbows.
The ring of a hook operated switch, (on the center phase if all three phases are open).
An open jumper using a hot clamp.
The tag holder on the control panel door of a rolled out PCB.
What information is necessary on properly filled out Red Clearance Tags?
TAGGED FOR: person who will hold the clearance.
LOCATION: description of line or equipment being cleared.
DEVICE: designation of the switch or equipment being opened, checked open, or removed.
TIME and DATE: when the switch was opened, checked open, or removed.
TAGGED BY: person performing switching and tagging.
ORDERED BY: name of dispatcher, (first initail and last name).
Yellow Caution Tags shall be used when necessary to indicate a hazardous situation, potential hazard, or unsafe condition that presents a threat of employee injury and placed on equipment or device so it can be easily seen. Examples where they are used:
Info Tag: provide information about an abnormal condition.
Hot Line Work: indicate a reclosing relay is out of service when Hot Line Work is being performed.
Hold Open: indicate a hold open on device or equipment when work is to stop for extended periods of time.
Hold Opens are used when a line or equipment is to be out of service for an extended period of time or while waiting for work to be performed at a later date. What is a hold open designed to protect?
Equipment from damage, not personnel!
Maintenance or work WILL NOT be performed under a Hold Open.