Service switches with no main bonding jumper or grounding electrode conductor?

Tainted

Tainted

Senior Member
Location
New York
Occupation
Engineer (PE)
I see service switches with no main bonding jumper or grounding electrode conductor see picture below..

Is there any magic reason I'm not seeing it? Am I missing something? I feel like the neutral is isolated from the enclosure.

1744081961743.png
 
The GEC is allowed to be terminated elsewhere, but there should be a main bonding jumper in the service disconnect.
 
Tainted said:
there is only a wire trough and service end box upstream
Click to expand...
The neutral is likely bonded upstream of the service disconnect however a MBJ is still required in the disconnect. The metal raceways are therefore providing the ground fault current path back to the neutral (there should be continuity between the neutral and the metal switch enclosure). As far as the GEC there may not be one. The missing MBJ and GEC are violations and there could be other issues like missing SSBJ's, bonding locknuts/bushings etc.
 
In the past I have seen switches like this with a field installed factory provided jumper that could be installed between one of the neutral lug bolts and the stud you see to the right of the neutral. It may be that the "jumper" as simply never installed.
1744120354386.png
 
augie47 said:
In the past I have seen switches like this with a field installed factory provided jumper that could be installed between one of the neutral lug bolts and the stud you see to the right of the neutral. It may be that the "jumper" as simply never installed.
View attachment 2576626
Click to expand...
To me it looks like one piece of bus but the photo isn't great. Maybe it's factory bonded?
 
infinity said:
The neutral is likely bonded upstream of the service disconnect however a MBJ is still required in the disconnect. The metal raceways are therefore providing the ground fault current path back to the neutral (there should be continuity between the neutral and the metal switch enclosure). As far as the GEC there may not be one. The missing MBJ and GEC are violations and there could be other issues like missing SSBJ's, bonding locknuts/bushings etc.
Click to expand...
How will the neutral get bonded upstream if there is only a wire trough and service end box? This is a very old installation (obviously).

augie47 said:
In the past I have seen switches like this with a field installed factory provided jumper that could be installed between one of the neutral lug bolts and the stud you see to the right of the neutral. It may be that the "jumper" as simply never installed.
View attachment 2576626
Click to expand...

Here is another pic with no MBJ or GEC found, this installation is newer:

1744130508087.png
 
Tainted said:
How will the neutral get bonded upstream if there is only a wire trough and service end box? This is a very old installation (obviously
Click to expand...
The neutral should be bonded upstream to the end box, and to the wireway. From there it connects to the service disconnect via a metal raceway.
 
You must log in or register to reply here.
Top