WyeDelta 240480 4 wire Transformer Bank 2018 Iowa

Wye/Delta 240/480 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.

OSHA Required Tailgate Discussion Topics • Hazards Associate with the job • Work Procedures Involved • Special Precautions • Energy Source Controls • PPE Required © 2018 Iowa Association of Electric Cooperatives

Work Procedures Involved Hazards associated with the job Energy Source Controls Special Precautions Personal Protective Equipment A safe job begins with a thorough inspection of… Be sure to. Tools record your Be certain all of your tools emergency location Be andaware post in ofayour area, be sure to cover arework in good shape. location everyone on the crew anything you can reach touch or fall into. And knows. anything that can reach fall into Equipment Make suretouch youror trucks are you! all in Have your PPE and First Aid kit needed Discuss all PPE for the job and wear your working order take time to preflight available Be toofinspect your equipment prior to use. are your equipment and insure there Working in traffic exposes you to hazards that Slips trips and PPE. falls aresure some the Be sureare your AEDIdentify isto accessible. alllook voltages you are exposed surprise. difficult control. Give vehicles plentyto. Be sure to most common injuries, fornothe all of your protective gear on. time tohave see and avoid you! Follow the hazards of that could cause this. Be. Arc-Flash afor dedicated observer Line/Structure Look over line and structure. Are manual of wear traffic. Identify control yourthe area. sure to inspect and your fall there any potential hazards? (Broken arrest harness. insulators, damaged wire, clearances over roads or from trees? ) © 2018 Iowa Association of Electric Cooperatives

Hang the required hardware Note the side that has two cutouts is opposite the

Remove the transformer tank straps from all but the lighting transformer. Ground all of

Connect the primary jumpers. Leaving the high side jumpers connected to the system H

Connect the H 2 bushings together but leave them floated/ungrounded. © 2018 Iowa Association

Complete the secondary connections as diagramed. Don’t connect the primary jumpers or close the cutouts Center until you have completed thetransformer X 1 connected as the connections. grounded transformer Neutral power © 2018 Iowa Association of Electric Cooperatives Wild Leg

Complete the secondary connections as diagramed. Right transformer connected as the lighting transformer Neutral

Complete the secondary connections as diagramed. Left transformer connected as the lighting transformer Neutral

To prevent the surge in voltage during energizing, Temporarily ground the primary Wye point during energizing. A fourth cutout X 1 can be added to assist in this for switching. Neutral power © 2018 Iowa Association of Electric Cooperatives Wild Leg