Grounding Conductor Clarification

[Unbridled]

Good Afternoon Gentlemen,
I have a 600A, 480v, 4 wire MCB Panelboard / Switchboard being served by a 1200A switchboard in existing building.
This 600A panelboard serves a 225KVA, 480/208/120V dry transformer.
The grounding conductor installed into the flex installed to the transformer...shall this conductor be identified property as a:
*EGC
*SSBJ
*SBJ

Also, being a separately derived system, shall the conductor bonding the transformer XO to building steel be properly identified as:
*EGC
*GEC

Thanx in advance
3 electrician debate

 

[Ponchik]

Good Afternoon Gentlemen,
I have a 600A, 480v, 4 wire MCB Panelboard / Switchboard being served by a 1200A switchboard in existing building.
This 600A panelboard serves a 225KVA, 480/208/120V dry transformer.
The grounding conductor installed into the flex installed to the transformer...shall this conductor be identified property as a:
*EGC
*SSBJ
*SBJ


Also, being a separately derived system, shall the conductor bonding the transformer XO to building steel be properly identified as:
*EGC
*GEC
SBJ

Thanx in advance
3 electrician debate

My answers in red If I can picture your installation correctly.

If I am wrong someone will set me straight.

 

[ActionDave]

Good Afternoon Gentlemen,
I have a 600A, 480v, 4 wire MCB Panelboard / Switchboard being served by a 1200A switchboard in existing building.
This 600A panelboard serves a 225KVA, 480/208/120V dry transformer.
The grounding conductor installed into the flex installed to the transformer...shall this conductor be identified property as a:
*EGC
*SSBJ
*SBJ

Which side of the transformer? If secondary, where is the XO bonded?

Also, being a separately derived system, shall the conductor bonding the transformer XO to building steel be properly identified as:
*EGC
*GEC

Thanx in advance
3 electrician debate

GEC

 

[infinity]

Good Afternoon Gentlemen,
I have a 600A, 480v, 4 wire MCB Panelboard / Switchboard being served by a 1200A switchboard in existing building.
This 600A panelboard serves a 225KVA, 480/208/120V dry transformer.
The grounding conductor installed into the flex installed to the transformer...shall this conductor be identified property as a:
*EGC
*SSBJ
*SBJ

Also, being a separately derived system, shall the conductor bonding the transformer XO to building steel be properly identified as:
*EGC
*GEC

Thanx in advance
3 electrician debate

Bold gives you the answer.

 

[jumper]

My answers in red If I can picture your installation correctly.

If I am wrong someone will set me straight.

SBJ would be from XO to transformer case or neutral buss in first disconnecting means to case. GEC as described in OP would be installed at that location also.

View attachment 17689

 

[Unbridled]

XFMR Grounding Conductors

XFMR Grounding Conductors

Which side of the transformer? If secondary, where is the XO bonded?


GEC

Thanks Dave,
The panelboard is fed with a 4 wire system @ 480V with the neutral floating.(from existing SWBD)
The XFMR primary is fed with a 3 wire system @ 480V from a 3 pole sub-breaker within this panel.
There are a couple of us electricians trying to discern what the name of the grounding conductor is that occupies that flex which also carries the ungrounded conductors to the XFMR.

We bonded the XO terminal of the XFMR's secondary to the frame and to Building Steel

 

[Unbridled]

XFMR Grounding Conductors

XFMR Grounding Conductors

SBJ would be from XO to transformer case or neutral buss in first disconnecting means to case. GEC as described in OP would be installed at that location also.

View attachment 17689

Thanks Derek,
The grounding conductor name we are procuring is installed in the flex feeding the primary side of XFMR.
Also, the XO terminal of the secondary side is bonded to the building steel. Is this a "GEC"?
Thanx in advance

 

[Smart $]

The grounding conductor installed into the flex installed to the transformer...shall this conductor be identified property as a:
*EGC
*SSBJ
*SBJ

A grounding conductor between a separately derived system source and the first disconnecting means is always a Supply-Side Bonding Jumper. See 250.30(A)(2).

Also, being a separately derived system, shall the conductor bonding the transformer XO to building steel be properly identified as:
*EGC
*GEC

This assumes the building [structural] steel qualifies as a grounding electrode. See 250.30(A)(4), and possibly (A)(5) or (A)(6).

If not, the conductor would be a simple BJ, not an EGC. See 250.104(D)

 

[Unbridled]

A grounding conductor between a separately derived system source and the first disconnecting means is always a Supply-Side Bonding Jumper. See 250.30(A)(2).



This assumes the building [structural] steel qualifies as a grounding electrode. See 250.30(A)(4), and possibly (A)(5) or (A)(6).

If not, the conductor would be a simple BJ, not an EGC. See 250.104(D)

Thanx Smart,
I am however referencing the name of the grounding conductor on the primary side of XFMR installed with the primary ungrounded conductors. I'm assuming assuming your comment including the "first disconnecting means"refers to being on the secondary side of XFMR

 

[ActionDave]

Thanks Derek,
The grounding conductor name we are procuring is installed in the flex feeding the primary side of XFMR...

That is an equipment grounding conductor.

 

[Unbridled]

XFMR SSBJ?

XFMR SSBJ?

A grounding conductor between a separately derived system source and the first disconnecting means is always a Supply-Side Bonding Jumper. See 250.30(A)(2).



This assumes the building [structural] steel qualifies as a grounding electrode. See 250.30(A)(4), and possibly (A)(5) or (A)(6).

If not, the conductor would be a simple BJ, not an EGC. See 250.104(D)

Thanx Smart,
I am however referencing the name of the grounding conductor on the primary side of XFMR installed with the primary ungrounded conductors. I'm assuming assuming your comment including the "first disconnecting means"refers to being on the secondary side of XFMR

 

[infinity]

Thanx Smart,
I am however referencing the name of the grounding conductor on the primary side of XFMR installed with the primary ungrounded conductors. I'm assuming assuming your comment including the "first disconnecting means"refers to being on the secondary side of XFMR

Yes EGC, see post #4....

 

[Smart $]

Thanx Smart,
I am however referencing the name of the grounding conductor on the primary side of XFMR installed with the primary ungrounded conductors. I'm assuming assuming your comment including the "first disconnecting means"refers to being on the secondary side of XFMR

On the primary side it is an EGC typically... but it can also be a combination EGC/GEC.