r_olson_06
Well-known member
What is the NEC code section for where and when grounding bushings are required? I know some but want to make sure I am not missing one.
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Grounding Bushings Clarification
- Thread starter r_olson_06
- Start date
Speedy Petey
Well-known member
There are no specific sections on bonding bushings that I know of. In fact, it is hard to find this term in the NEC. You'll find the opposite, like saying you cannot rely on standard locknuts and bushings like seen here:
250.92 Services.
(B) Method of Bonding at the Service. Bonding jumpers meeting the requirements of this article shall be used around impaired connections, such as reducing washers or oversized, concentric, or eccentric knockouts. Standard locknuts or bushings shall not be the only means for the bonding required by this section but shall be permitted to be installed to make a mechanical connection of the raceway(s).
OP
r_olson_06
Well-known member
I know also on concentric knockouts are required, and rigid service conduits that set in the bottom of a switchboard section.
OP
r_olson_06
Well-known member
anyone have some more information on this?
Aceman
Well-known member
Maybe it would be easier if you told us what you're doing and then we can go from there?
Speedy Petey
Well-known member
I am also confused as to what you are looking for.
Are you looking for every reference to a bonding bushing in the NEC?
Are you looking for every reference to a bonding bushing in the NEC?
rockwithjason
Well-known member
I am also confused as to what you are looking for.
Are you looking for every reference to a bonding bushing in the NEC?
i was wondering the same thing.
Higgins
Well-known member
Here is what the electricians do that are wiring up the local Habitat houses. This is new as of 2 yrs ago!
They use a stranded green wire (#6 ??) that starts at the ground bar inside the electrical panel, then goes to the ground bushing inside the panel, then it goes thru the 2" ridged pipe to the meter housing, connects in 2 places inside the housing, bushing and meter base, then exits the pedestal, and connects to the ground rod!
The wire is one continuous piece!
Don't know if this helps or not!
They use a stranded green wire (#6 ??) that starts at the ground bar inside the electrical panel, then goes to the ground bushing inside the panel, then it goes thru the 2" ridged pipe to the meter housing, connects in 2 places inside the housing, bushing and meter base, then exits the pedestal, and connects to the ground rod!
The wire is one continuous piece!
Don't know if this helps or not!
OP
r_olson_06
Well-known member
Yes I understand for housing what is require. I hear so much that you need one when running 480v in sealtight or flex. Or you need one above so many amps which I know is not true. I am working on several project with very large motor(500+hp) and running a flexible joint to the peckerhead is a must. Now is a bond bushing required on the installation at the peckerhead I think yes. But is it also required in the VFD cabinet where the conduits run. I read through the code on this but could not find much. I have one motor with 4 paralleled sets of 250Kcmil copper 600hp and another with 3 sets of 250kcmil copper 400hp. So is a bond bushing required on no sides, one side and if so if it side specific or both. motors operate at 480VAC.
Hope this clarify what the install entails
Hope this clarify what the install entails
Aceman
Well-known member
You don't need a bond bush on a sealtite connector. Depending on how you ran your conduit, you may need to bond around the sealtite though.