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	Subject - 3-Phase Transformer Connected to Secondary Panel Scott Vickrey This is a drawing of a 3 phase transformer connected to it's secondary panel bonding in the first switch. This is a larger drawing and you can find a smaller one below. I have intentionally left this drawing blank so you can add whatever annotations you feel are appropriate to convey the information you would like. This can be accomplished with almost any graphics editor. Like all drawings I create it has an optimized file size for minimal bandwith usage and uses only web safe colors. Enjoy! To use this image on any site: Use the following address. http://www.electricalknowledge.com/images/3PhTranSecPanelLargeBlank1.gif Requirements for use: Include a link to http://www.electricalknowledge.com/default.asp?CAT_ID=6 Try to state that this is a link to EK's Images and Drawings collection. Some thing like this From ElectricalKowledge's Free Images and Drawing Collection Scott Vickrey This is the same drawing of a 3 phase transformer connected to it's secondary panel with the bonding done in the first switch. This is the large transparent version. I have intentionally left this drawing blank so you can add whatever annotations you feel are appropriate to convey the information you would like. This can be accomplished with almost any graphics editor. This drawing has an optimized file size for minimal bandwith usage and uses only web safe colors. Enjoy! To use this image on any site: Use the following address. http://www.electricalknowledge.com/images/3PhTranSecPanelLargeBlankTrans1.gif Requirements for use: Include a link to http://www.electricalknowledge.com/default.asp?CAT_ID=6 Try to state that this is a link to EK's Images and Drawings collection. Something like this From ElectricalKowledge's Free Images and Drawing Collection Scott Vickrey This is a smaller version of the 3 phase transformer connected to it's secondary panel with the bonding done in the first switch. I have intentionally left this drawing blank so you can add whatever annotations you feel are appropriate to convey the information you would like. This can be accomplished with almost any graphics editor. This drawing has an optimized file size for minimal bandwith usage and uses only web safe colors. Enjoy! To use this image on any site: Use the following address. http://www.electricalknowledge.com/images/3PhTranSecPanelSmallBlank1.gif Requirements for use: Include a link to http://www.electricalknowledge.com/default.asp?CAT_ID=6 Try to state that this is a link to EK's Images and Drawings collection. Something like this From ElectricalKowledge's Free Images and Drawing Collection Scott Vickrey This is a smaller transparent background version of the 3 phase transformer connected to it's secondary panel with the bonding done in the first switch. I have intentionally left this drawing blank so you can add whatever annotations you feel are appropriate to convey the information you would like. This can be accomplished with almost any graphics editor. This drawing has an optimized file size for minimal bandwith usage and uses only web safe colors. Enjoy! To use this image on any site: Use the following address. http://www.electricalknowledge.com/images/3PhTranSecPanelSmallBlankTrans1.gif Requirements for use: Include a link to http://www.electricalknowledge.com/default.asp?CAT_ID=6 Try to state that this is a link to EK's Images and Drawings collection. Something like this From ElectricalKowledge's Free Images and Drawing Collection Scott Vickrey I made some changes to help bring this installation up to code. Look it over and tell me if you still see something wrong. Remember this installation is using the method where the main bonding jumper is in the first disconnect using the green bonding screw. The grounding electrode is the building steel in the ceiling (which is not shown). Ryan_J It looks like lots of single pole breakers with no nuetral. If this is a power panel, you wouldn't need a nuetral, but you also wouldn't need the main breaker. cooker4160 Looks like Ryan hit it on the head the xo terminal should have a white conductor going to your neutral bus and if you are bonding in the transformer, which is what I am seeing, then a seperate equipent grounding bus installed Scott Vickrey Would edit but lost the drawing in my last hard drive crash! David Hyatt This would be an example of a 240 volt delta panel no neutral. Right????