1. Wye/Delta 120/240 4 wire Transformer Bank
© 2018 Iowa Association of Electric Cooperatives
DISCLAIMER: This job hazard analysis (JHA) has been made available for informational and educational purposes only. The IAEC does not make any representation or warranty with respect to the accuracy, applicability, fitness, or completeness of the JHA. The IAEC hereby disclaims any and all liability to any party for any direct, indirect, implied, punitive, special, incidental or other consequential damages arising directly or indirectly from any use of this JHA which is provided as is.

2. OSHA Required Tailgate Discussion Topics
Hazards Associate with the job
Work Procedures Involved
Special Precautions
Energy Source Controls
PPE Required
The five topics required by OSHA to discuss in the tailgate.
First letter from each topic = How Well Should Everyone Plan
© 2018 Iowa Association of Electric Cooperatives

3. Work Procedures Involved Hazards associated with the job
Special Precautions
Energy Source Controls
Personal Protective Equipment
Be sure to record your emergency location and post in a location everyone on the crew knows.
Have your PPE and First Aid kit available
Be sure your AED is accessible.
A safe job begins with a thorough inspection of…
Tools Be certain all of your tools are in good shape.
Equipment Make sure your trucks are all in working order take time to preflight your equipment and insure there are no surprise.
Line/Structure Look over the line and structure. Are there any potential hazards? (Broken insulators, damaged wire, clearances over roads or from trees?)
Be aware of your work area, be sure to cover anything you can reach touch or fall into. And anything that can reach touch or fall into you!
Discuss all PPE needed for the job and wear your PPE. Be sure to inspect your equipment prior to use. Identify all voltages you are exposed to. Be sure to have all of your Arc-Flash protective gear on.
Identify a dedicated observer
Working in traffic exposes you to hazards that are difficult to control. Give the vehicles plenty of time to see and avoid you! Follow the manual of traffic control for your area.
Slips trips and falls are some of the most common injuries, look for hazards that could cause this. Be sure to inspect and wear your fall arrest harness.
Here are the five topics again with signs and bubbles to jump start tailgate discussion!!
Click on the icon to bring up a text box. Click on the icon again to make the text box go away
Gets the crew involved. Gives the feeling of knowing it is ok to ask questions, give suggestions, see something, say something!
The next slides will get directly into the task at hand. Visual, written and audio will all be used here!
There are suggestions in the notes as to what to discuss. This will get the Team involved, creating communication channels to open!
© 2018 Iowa Association of Electric Cooperatives

4. Hang the required hardware
Note the side that has two cutouts is opposite the system neutral.
© 2018 Iowa Association of Electric Cooperatives

5. Remove the transformer tank strap from all but the lighting transformer.
Ground all of the transformer cases as well as the transformer cluster.
© 2018 Iowa Association of Electric Cooperatives

6. Connect all the H2’s together but do not connect them to ground (float the Wye Point).
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7. Connect the primary jumpers
Connect the primary jumpers. Leaving the high side jumpers connected to the system neutral until the entire connection is completed. H1 H2
© 2018 Iowa Association of Electric Cooperatives

8. Complete the secondary connections as diagramed.
Center transformer connected as the lighting transformer X1
Neutral
Lighting
Lighting
Wild Leg
© 2018 Iowa Association of Electric Cooperatives

9. Complete the secondary connections as diagramed.
Right transformer connected as the lighting transformer X3 X1 X2
Neutral
Lighting
Wild Leg
Lighting
© 2018 Iowa Association of Electric Cooperatives

10. Complete the secondary connections as diagramed.
Left transformer connected as the lighting transformer X2 X1
Neutral
Lighting
Wild Leg
Lighting
© 2018 Iowa Association of Electric Cooperatives

11. To prevent the surge in voltage during energizing, Temporarily ground the primary Wye point during energizing. X1 X2
Neutral
lighting
lighting
Wild Leg
© 2018 Iowa Association of Electric Cooperatives

12. To prevent the surge in voltage during energizing, Temporarily ground the primary Wye point during energizing. A fourth cutout can be added to assist in this for switching. X1
Neutral
lighting
lighting
Wild Leg
© 2018 Iowa Association of Electric Cooperatives