Grounding Issue in an SDS
Grounding Issue in an SDS
(OP)
Hello,
I am installing a small (60A) sub panel in our work shop. The plant is powered by an ungrounded Delta system. The 480VAC feeds a set of transformers and steps down to 240 3 phase. This feeds a bus that distributes to various things. I want to add a small 12 circuit panel of 208 VAC single phase. I am using two phases of the 240 off of the bus.
The problem I'm having is that we have no ground or neutral pulled through the building. I want to install a ground rod at the panel but I got through the concrete and hit ledge about 24" down. There are no ground rods anywhere on the premises that I'm aware of.
How can I create a ground? I was thinking of using the building beams but do not know if the anchor bolts even contact the soil. Or, is that not necessary?
Also, can I use the sprinkler system piping as a ground?
Thanks in advance for your help.
Ray
I am installing a small (60A) sub panel in our work shop. The plant is powered by an ungrounded Delta system. The 480VAC feeds a set of transformers and steps down to 240 3 phase. This feeds a bus that distributes to various things. I want to add a small 12 circuit panel of 208 VAC single phase. I am using two phases of the 240 off of the bus.
The problem I'm having is that we have no ground or neutral pulled through the building. I want to install a ground rod at the panel but I got through the concrete and hit ledge about 24" down. There are no ground rods anywhere on the premises that I'm aware of.
How can I create a ground? I was thinking of using the building beams but do not know if the anchor bolts even contact the soil. Or, is that not necessary?
Also, can I use the sprinkler system piping as a ground?
Thanks in advance for your help.
Ray
General Hammond: "O'Neil, what the hell are you doing?" O'Neil: "Right in the middle of my backswing?!?!"






RE: Grounding Issue in an SDS
RE: Grounding Issue in an SDS
Keith Cress
kcress - http://www.flaminsystems.com
RE: Grounding Issue in an SDS
General Hammond: "O'Neil, what the hell are you doing?" O'Neil: "Right in the middle of my backswing?!?!"
RE: Grounding Issue in an SDS
If there is enough continuous rebar to make a good connection to the concrete the concrete will make a good ground.
Look up Ufer in Wiki.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Grounding Issue in an SDS
I think a lot of new houses in my area are built that way.
And, thanks for explaining the 'ledge' to me SparkRay. I had no idea that was a Northeastern phenomenon.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Grounding Issue in an SDS
I found several places where there is a ground rod in place and then tied to the building's main columns. I should be okay tying to the columns.
General Hammond: "O'Neil, what the hell are you doing?" O'Neil: "Right in the middle of my backswing?!?!"