Multiple Transformers on 1 Grounding Rod

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mmiller

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So I have an area in our shop that will be having a couple of trnasformers installed. They are all close in proximity. If I were to drive a ground rod for each one they would be too close (the rods) to each other.

Can I drive one rod for multiple transformers ?

These are all being fed from the same 480 panel

480 delta to 240 delta 3 phase
we may use a 120v LT (x4) from one of the transofrmers. Will this cause any issues when I bond the neutral and ground

The transformers sizes are
30 KVA
30 KVA
75 KVA

Thanks
Mike
 
mmiller said:
So I have an area in our shop that will be having a couple of trnasformers installed. They are all close in proximity. If I were to drive a ground rod for each one they would be too close (the rods) to each other.

Can I drive one rod for multiple transformers ?

These are all being fed from the same 480 panel

480 delta to 240 delta 3 phase
we may use a 120v LT (x4) from one of the transofrmers. Will this cause any issues when I bond the neutral and ground

The transformers sizes are
30 KVA
30 KVA
75 KVA

Thanks
Mike
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Why do want to use ground rods? Do you have a cold water ground near by or building steel? You can use those. In fact I believe you have to use one of those per 250.30(A)4.
 
The transformers must be connected to the buildings grounding electrode system, not just an isolated ground rod. Take a look at 250.30.

Chris
 
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