The ground bar that is mounted directly onto the cabinet shouldn’t also need the bonding jumper. However, the “isolated” ground bar where the tie bar was removed, would need the bonding jumper.
The note at the bottom regarding the tie bar should be removed and the tie bar should be shown connecting the two neutral buses together as it would come out of the box. This panel already has a separate EGC bus so you would not be removing the tie bar to create a separate EGC bus.
As Richard stated the EGC bus bolted to the cabinet is all that is required and there would not be a main bonding jumper (MBJ) connecting the EGC bus to the metal enclosure. A MBJ connects a neutral to the enclosure in a service disconnect not the EGC bus to the enclosure.
The ground bar is usually a separately purchased accessory. But I do see your point, you would either use one or the other method, but not both.
Correct it can be done either way. The wording stating that the tie bar must be removed is incorrect when you’ve installed a separate EGC bus as shown.
The label on the SER is misleading. It should not say from main electrical panel. It may be coming from the emergency disconnect or a service disconnect.
Image updated. Hit refresh: Subpanel or Additional Distribution Panelboard - Inspection Gallery - InterNACHI®
Does the 240v branch circuit shown have a neutral because it is a 120/240 volt circuit like a range or dryer?
It’s even more confusing. The wording now makes it sound like you must optionally bond the tie bar to the enclosure using the main bonding jumper. WHAT!?!
And again, likely never would you find a bonding strap on a ground bar mounted directly on the enclosure. Based on the (unlikely) scenario that your trying to create, it would go to the liberated neutral bar.
Still problems with this image. The jumper between the two neutral busbars should be shown attached. It does not bond to the enclosure unless a screw protrudes through the neutral busbar insulation and contacts the enclosure. Said screw is usually green and at the top right neutral bus.
The grounding bus bar is attached directly to the enclosure and will NEVER in this design need a copper bonding clip. The clip can simply be omitted it is never used for this type of grounding bar. It is most commonly seen connecting the neutral bus to the enclosure in a service (main) panel to connect (bond) the ground and neutral.
The only 2 breakers that need a handle tie are the 2 top right that feed a 240v circuit.
None of these panel drawings are particularly helpful. First they are drawn wrong; and secondly they may not show the correct assembly for any given panel. It is far easier to simply take a GOOD picture of the panel in question and point to the incorrect installations. There are a lot of different panels out there.
The ungrounded conductors are not service conductors. They are feeder conductors.
The note about the origin of the SER was not changed either.
Hopefully the next changes will not make it even worse.
Updated: Subpanel or Additional Distribution Panelboard - Inspection Gallery - InterNACHI®
Hit refresh.
Thanks fellas!
The ungrounded conductors still say service conductors an as Jim stated prior they are feeder conductors. The word service is incorrect.
I disagree. Are you certain?
Yes. The word service is still there in the box, upper left.
Uh. OK. Updated: Subpanel or Additional Distribution Panelboard - Inspection Gallery - InterNACHI®
Hit refresh.
Thanks!
Still says service conductors.
Refresh the image.
Thanks for the graphic. This graphic applies to a sub/distribution panel within the same building.
An additional graphic request: For a sub/distribution panel in a separate building, the same configuration applies, but a grounding conductor connected to a ground rod located at the separate building is required. A second version of this image, with the grounding conductor added will be useful for separate building applications.