Transformer Grounding

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mstrlucky74

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NJ
When grounding a xfrmr you can either attach to bldg. steel or attach to a ground bar, correct? What is most common? Thanks

It becomes confusing with grounding electrode, grounding conductor, bonding to a water pipe etc. etc. It it simplied in some way to what needs to be done to conform to code to establish effective grounding and bonding?
 
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infinity

infinity

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New Jersey
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Journeyman Electrician
A few details are needed. First the building type either poured concrete or structural steel (I'll leave off wood structures). Structural Steel buildings will allow you to connect to it at the location of the transformer. A poured concrete building will typically have a common ground riser that connects the to the building grounding electrode system and is tapped at various locations (sometimes with a ground bar) to the transformer(s).
 
augie47

augie47

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Tennessee
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State Electrical Inspector (Retired)
From:
250.30 Grounding Separately Derived Alternating-Current Systems.
(7) Grounding Electrode. The grounding electrode shall be as near as practicable to and preferably in the same area as the grounding electrode conductor connection to the system. The grounding electrode shall be the nearest one of the following:
(1)
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Metal water pipe grounding electrode as specified in 250.52(A)(1)
(2)
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Structural metal grounding electrode as specified in 250.52(A)(2)
Exception No. 1: Any of the other electrodes identified in 250.52(A) shall be used where the electrodes specified by250.30(A)(7) are not available.
Exception No. 2 to (1) and (2): Where a separately derived system originates in listed equipment suitable for use as service equipment, the grounding electrode used for the service or feeder equipment shall be permitted as the grounding electrode for the separately derived system.
 
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mstrlucky74

Senior Member
Location
NJ
infinity said:
A few details are needed. First the building type either poured concrete or structural steel (I'll leave off wood structures). Structural Steel buildings will allow you to connect to it at the location of the transformer. A poured concrete building will typically have a common ground riser that connects the to the building grounding electrode system and is tapped at various locations (sometimes with a ground bar) to the transformer(s).
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So Inf you have seen transformers grounded with a GEC to a ground bar in the room?


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