Service equipment

[kwired]

What I was trying to say is. If you add a bar that you land neutrals on. A jumper is required. I think that was added to the NEC in 99

Not sure about the when, what you said is basically true, pretty sure it isn't worded that way but rather worded to state that the enclosure can not be sole path for grounded conductor current.

 

[david]

Most of us generally try to not have any connection at all between a grounding electrode conductor and a service ungrounded conductor - doing so typically results in high amount of current flow.

yep to tired when i typed that

 

[augie47]

What I was trying to say is. If you add a bar that you land neutrals on. A jumper is required. I think that was added to the NEC in 99

200.2(B) is where that is covered, I believe.

 

[hhsting]

The answer is the neutral, or both.

The service enclosure must be bonded to the neutral. See above. A lot of service equipment, but not all, comes with the neutral bonded to the enclosure by the factory. If it comes bonded by the factory it is typically allowed to be used only as service equipment.

If there is a separate equipment grounding bar, it must be bonded to the service enclosure or the neutral. Since those two options are already required to be bonded, you'll be bonding all three together regardless of how you go about it. You are not required to have an equipment grounding terminal bar in service equipment, although it's good practice. (It is not a code violation to bond all the equipment grounding to the service enclosure with separate terminations, provided they are proper terminations. It's just sloppy when you could use a bar.) Usually equipment grounding bars are attached to enclosures such that they are bonded by the attachment. You can also use an equipment grounding bar as the means to bond an isolated neutral and the enclosure together.

The only grounding item that you may not bond to the neutral through the service enclosure is a grounding electrode conductor.

What I have is meter stack 6 - 200A meters 208/120V three phase.

All please see attched pictures from NEC 2014 handbook. The pictures show equipment grounding bar bonded to the service can either thru wire or green screw not neutral bar. The netural bar is bonded thru main bonding jumper to equipment grounding conductor bar and service can. This is Option B but you are saying Option A is correct? How is this possible?

 

[Buck Parrish]

They are the same until you leave the first disconnect. Just remember the utilities grounded conductor (neutral) is the ground until you leave the first disconnect.

 

[david]

What I have is meter stack 6 - 200A meters 208/120V three phase.

All please see attched pictures from NEC 2014 handbook. The pictures show equipment grounding bar bonded to the service can either thru wire or green screw not neutral bar. The netural bar is bonded thru main bonding jumper to equipment grounding conductor bar and service can. This is Option B but you are saying Option A is correct? How is this possible?

The “service can” is required to be grounded

Metal conduits connected to the metal can are approved types of equipment grounds

The main bonding jumper by definition is the bond between the neutral and the equipment grounding

We in discussion have addressed three types of main bonding jumpers
The wire type
The busbar type
The green screw type

All three of the above are approved main bonding jumpers to bond the neutral to the equipment grounding, which includes the metal service can and any metal conduit attached to the can

The connection of the grounding electrode conductor is a different discussion

The neutral must shake hands with the grounding electrode conductor if you will.
(direct bond)

There is however an allowance to extend that direct connection by using two of the main bonding jumpers, the busbar type, or the wire type.

The green screw is not approved for that bond, I like the fact that the screw is required to be green because we associate green with equipment grounding and actually bonding between the neutral and equipment grounding system is all that the green screw is approved for.

If you use an equipment ground bus to bond the neutral to the grounding electrode conductor you must first ensure there is an approved main bonding jumper of the wire or busbar type extending the the direct bond between the two

 

[hhsting]

The “service can” is required to be grounded

Metal conduits connected to the metal can are approved types of equipment grounds

The main bonding jumper by definition is the bond between the neutral and the equipment grounding

We in discussion have addressed three types of main bonding jumpers
The wire type
The busbar type
The green screw type

All three of the above are approved main bonding jumpers to bond the neutral to the equipment grounding, which includes the metal service can and any metal conduit attached to the can

The connection of the grounding electrode conductor is a different discussion

The neutral must shake hands with the grounding electrode conductor if you will.
(direct bond)

There is however an allowance to extend that direct connection by using two of the main bonding jumpers, the busbar type, or the wire type.

The green screw is not approved for that bond, I like the fact that the screw is required to be green because we associate green with equipment grounding and actually bonding between the neutral and equipment grounding system is all that the green screw is approved for.

If you use an equipment ground bus to bond the neutral to the grounding electrode conductor you must first ensure there is an approved main bonding jumper of the wire or busbar type extending the the direct bond between the two

Ok service can should be bonded either thru wire, screw, bus etc thats not the question. Question is should the service can be bonded to neutral bar or bonded to equipment grounding conductor bar inside service disco?

 

[roger]

Question is should the service can be bonded to neutral bar or bonded to equipment grounding conductor bar inside service disco?

You said in your first post the 200 amp panelboard is your service equipment and the question has been answered.

Roger