Sizing a bonding screw

Light Sabre said:
Where does the grounded conductor get its reference to ground from?
Click to expand...
Initially, the multi-grounded neutral system of the power co.

For lightning, the lowest impedance pathway to the earth is best.

For faults, the lowest impedance pathway to the transformer neutral is best.
 
Light Sabre said:
The top two green conductors are electrodes… 😉
What do y’all think? Pass inspection or fail inspection?
Click to expand...
Also fail.

1. GECs land on the neutral bus (or via wire), not the EGC bus.

2. If one of them connects to rods, it mustn't be aluminum.
 
One goes to water and one goes to foundation steel, but yeah… I would also say fail. No wire or busbar connection.
 
Light Sabre said:
One goes to water and one goes to foundation steel, but yeah… I would also say fail. No wire or busbar connection.
Click to expand...
That's easy. The neutral buses should already have one or two large terminals at the bottom.

If not, move the added terminal to the neutral bus and get another one.

Light Sabre said:
Only, you install a wire and discard the screw, right?
Click to expand...
No and yes.

No, unless you mean a separate EGC from whatever new service disconnect is being added.

Yes, removing the screw and not having to relocate all of the EGCs to an added EGC bus.
 
There’s another code violation about it. The meter is to the left, and not in view, but you can see enough to know this is not a good installment of equipment. Do you see what I see?IMG_0152.jpeg
 
Light Sabre said:
There’s another code violation about it. The meter is to the left, and not in view, but you can see enough to know this is not a good installment of equipment. Do you see what I see?
Click to expand...
The panel is sloppy but that's not a violation. I would fire someone who twisted the EGC's together but that's just me. There is an issue with the raceway entry.

312.2 Damp and Wet Locations.
In damp or wet locations, surface-type enclosures within the scope of this article shall be placed or equipped so as to prevent moisture or water from entering and accumulating within the cabinet or cutout box, and shall be mounted so there is at least 6-mm (1∕ 4-in.) airspace between the enclosure and the wall or other supporting surface. Enclosures installed in wet locations shall be weatherproof. For enclosures in wet locations, raceways or cables entering above the level of uninsulated live parts shall use fittings listed for wet locations.
Click to expand...
 
infinity said:
The panel is sloppy but that's not a violation. I would fire someone who twisted the EGC's together but that's just me. There is an issue with the raceway entry.
Click to expand...

You nailed it! I was more interested in asking the questions I get asked, and interpretations I have heard about, where and why we put the GEC’s where we do. “The screw is sized” is not viable.
 
You must log in or register to reply here.
Top