Bonding bushing

Status
Not open for further replies.
M

mannyb

Senior Member
Location
Florida
Occupation
Electrician
I have 100' conduit with 10' rigid conduit going and coming out at each end with pvc in between running underground. Do I need to bond the rigid conduit with a grounding lock nut or grounding bushing ? Or is the lock nut good enough for bonding requirements along with EGC bonded at both ends? My best reference is 250.109 and 250.110.
 
Here is something for the OP

250.97 Bonding for Over 250 Volts. For circuits of over
250 volts to ground, the electrical continuity of metal raceways
and cables with metal sheaths that contain any conductor other
than service conductors shall be ensured by one or more of the
methods specified for services in 250.92(B), except for (B)(1).
Exception: Where oversized, concentric, or eccentric knockouts are not
encountered, or where a box or enclosure with concentric or eccentric
knockouts is listed to provide a reliable bonding connection, the following
methods shall be permitted:
(1) Threadless couplings and connectors for cables with metal
sheaths
(2) Two locknuts, on rigid metal conduit or intermediate metal
conduit, one inside and one outside of boxes and cabinets
(3) Fittings with shoulders that seat firmly against the box or cabinet,
such as electrical metallic tubing connectors, flexible metal
conduit connectors, and cable connectors, with one locknut on
the inside of boxes and cabinets
(4) Listed fittings
Click to expand...
 
mannyb said:
I have 100' conduit with 10' rigid conduit going and coming out at each end with pvc in between running underground. Do I need to bond the rigid conduit with a grounding lock nut or grounding bushing ? Or is the lock nut good enough for bonding requirements along with EGC bonded at both ends? My best reference is 250.109 and 250.110.
Click to expand...
Too many variables to give a prpoer answer. As ptonsparky asked, start with what is the voltage?
 
ptonsparky said:
We wouldn't use the RMC to begin with. Sch 80 up out of the ground.
No, it is not necessary to use bonding bushings everywhere but I do need a bushing on RMC not necessarily EMT.
Click to expand...

The job requires RMC at each end out of the ground. I wanted to see if I was missing something with this application as fas as bonding....POCO requires a grouding stinger at the weather head when you install PVC underground and RMC as riser no matter the voltage. When I saw this application for this job then POCO grounding came to mind. Thanks for help
 
Last edited by a moderator:
mannyb said:
The job requires RMC at each end out of the ground. I wanted to see if I was missing something with this application as fas as bonding....POCO requires a grouding stinger at the weather head when you install PVC underground and RMC as riser no matter the voltage. When I saw this application for this job then POCO grounding came to mind. Thanks for help
Click to expand...

Given that these conduits contain service conductors, you need a bonding bushing, or other means of connecting a bonding jumper, at at least one end. Service conductors or GEC conductors contained within the conduit, are factors that require a bonding bushing.

For circuits in general that contain neither service conductors nor GEC's, it is when you have missing continuity (e.g. plastic enclosure connections) or impaired continuity (ring KO's and >250V to ground) that causes the need for a bonding bushing.
 
Status
Not open for further replies.
Top