GEC Connection Terminated On Outside

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gonec

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I know a lot of you have probally seen separtley derivie systems (transformers) have the Grounding Electrode Conductor (GEC) terminated on the outside casing of the xformer. Inside the Xo is bonded to the frame enclouser of the xformer.

I belive this is in contrast to the code.

In review the 2005 NEC250.24 it states that the GEC has to connect to the grounded service conductor or per 250.24 (4) ground terminal bus.

Also per the 8th edition of SCORES pg 71 Low Impedance GEC Connections it specifically notes that this connection has to be "within" the enclouser on the grounded service conductor.

Would connecting the GEC on the outside of the xformer with the XO bonded properly inside contrast he code?
 
Gonec,

I have never seen the GEC connected to the outside of the transformer enclosure.

The GEC is required to connect to the grounded conductor.
 
250.30(3) " . . . This connection shall be made at the same point on the separately derived system where the system bonding jumper is connected." 2008.
Same point = Other end of the same bolt as the unspliced jumper on the inside?


May be ok, not sure. Don't like it though.
 
benaround said:
Gonec,

I have never seen the GEC connected to the outside of the transformer enclosure.

The GEC is required to connect to the grounded conductor.
Click to expand...

I think the op is talking about the lugs on the outside if the xfmr. to land the ground rod to. With that situation I run the gec from the ground rod thru the outside lug, then into the case to go to xo. I believe it has to land to the xo though. In other words you can't stop it at the lug outside then use a bonding strap on the inside to bond xo to the case.
 
Thanks for the reply. I adgree with you.

It appears that they are using the same bolt as you mentioned.

When I read SCORES pg 71 It specifically states that this connection has to be made "within".

In a leagal postion of how the NEC code is worded would this be a violation?
Since it sates that the connection has to be to the grounded conductor" inside" or to a ground bus "within"
 
gonec said:
Thanks for the reply. I adgree with you.

It appears that they are using the same bolt as you mentioned.

When I read SCORES pg 71 It specifically states that this connection has to be made "within".

In a leagal postion of how the NEC code is worded would this be a violation?
Since it sates that the connection has to be to the grounded conductor" inside" or to a ground bus "within"
Click to expand...

Does the NEC say inside or within?
 
Volta,

Great point. No they do not say " inside" or "within".

When I was reading SCORES they made a major point in the page article "Low Impedance Grounding Electrode Conductor Connection" that it was creitical that this connection be made within or inside. The wording was mentioned about ten times and they also noted it in the figure diagrams provided.

I am always trying to better unstand grounding by cross referencing the NEC, SCORES and IEEE Green book to geyt a better clarity on wording and practices used.
 
Gonec, 250.64(C) requires GEC to be one continous length without a splice or joint,

excpt. irreversible comperssion-type connectors or exothermic welding

excpt. busbars connected together.

I would say its a violation .
 
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