Transformer grounding.

1675 Views 4 Replies 3 Participants Last post by Anthony young, Feb 7, 2014

Anthony young

Discussion Starter · Feb 7, 2014

Hey guys, I was just looking for a litle feedback on how most of you guys wire up the grounding on transformers. I have seen it done so many different ways. My personal preference is to connect my primary ground directly to the neutral bus on the transformer, then install my bonding jumper down to the grounding bus where I connect my secondary ground to structural steel along with the ground that goes directly to the panel that the transformer is feeding and also the grounds that tie to the bonding bushings. Like I said, I have seen the grounding wired up many different ways. I commonly see that a lot of people put all of their grounds including the primary all on the grounding bus that you have to install to the transformer casing and feed that ground bus with the jumper from the neutral bus. I personally like to connect my primary ground directly to my neutral bus and all other grounds to the grounding bus that I install at the bottom of the transformer. Really no matter how you do it, you are still connecting all of your grounds together and connecting them to the neutral bus via jumper. What are some of you guys thoughts and preferences on how you like to do it?

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drumnut08

· #4 · Feb 7, 2014

Anthony young said:
Hey guys, I was just looking for a litle feedback on how most of you guys wire up the grounding on transformers. I have seen it done so many different ways. My personal preference is to connect my primary ground directly to the neutral bus on the transformer, then install my bonding jumper down to the grounding bus where I connect my secondary ground to structural steel along with the ground that goes directly to the panel that the transformer is feeding and also the grounds that tie to the bonding bushings. Like I said, I have seen the grounding wired up many different ways. I commonly see that a lot of people put all of their grounds including the primary all on the grounding bus that you have to install to the transformer casing and feed that ground bus with the jumper from the neutral bus. I personally like to connect my primary ground directly to my neutral bus and all other grounds to the grounding bus that I install at the bottom of the transformer. Really no matter how you do it, you are still connecting all of your grounds together and connecting them to the neutral bus via jumper. What are some of you guys thoughts and preferences on how you like to do it?

. First off , you need to stop referring to XO in a dry type XFMR as the " neutral bus " . It's a tab for a lug at best . A neutral bus or bar is in a panel board or load center . I usually mount a multi position ground bar to the transformer casing under the core bonding strap or very close to it . I wire wheel off all the paint where the lug gets bolted down . Primary , secondary , and building steel grounds go to this bar . A bonding jumper either gets installed here or at the panel . I always do it here . This obviously goes between xo ( double barrel lug ) , and the common ground bar where all other grounds terminate . I don't think it's a very good idea taking your primary ground right to xo ? Look into the long multi position ground bars . 2 bolts and enough spaces for all your ground wires .

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