Hello All here is the issue:
We have several precast concrete sidewalk pull boxes with cast iron covers roughly 24”x 36”x18”. Conduits that enter the pull boxes are RGS. The conduits currently have insulated throat ground bushings with a bare copper conductor bonding all of the conduits together. The voltage is 208V/120V. Currently, no splices in the pull box. There are three different branch circuits in the various conduits that enter the pull boxes. Each conduit has at least one dedicated ground conductor. Cover not bonded to bare copper jumper mentioned earlier.
Issue: All of the conduit ends inside the pull box are corroded and the ground bushings have more or less rusted off of the conduit.
Scenario 1:
As is, are the ground bushings required? No splices are performed in the pull box, not using the raceway as a EGC since dedicated ground conductors are in each conduit, and I don’t believe the non-concentric knockout stipulation applies.
Code sections reviewed:
250.148, 250.96(A), 250.97 (for reference if it was over 250V), 250.92(B) (for reference if it were a service or over 250V),
At the minimum I feel that this installation is in violation of 314.30(D) due to lack of cover bonding. Though I don’t know because 314.30(D) points to 250.96(A) which says “…and other non-current-carrying parts that are to serve as equipment grounding conductors…”.
Scenario 2:
How does the all of the above change if a splice is made inside the pull box of one of the circuits due to replacing a section of that circuit further down the line?
We have several precast concrete sidewalk pull boxes with cast iron covers roughly 24”x 36”x18”. Conduits that enter the pull boxes are RGS. The conduits currently have insulated throat ground bushings with a bare copper conductor bonding all of the conduits together. The voltage is 208V/120V. Currently, no splices in the pull box. There are three different branch circuits in the various conduits that enter the pull boxes. Each conduit has at least one dedicated ground conductor. Cover not bonded to bare copper jumper mentioned earlier.
Issue: All of the conduit ends inside the pull box are corroded and the ground bushings have more or less rusted off of the conduit.
Scenario 1:
As is, are the ground bushings required? No splices are performed in the pull box, not using the raceway as a EGC since dedicated ground conductors are in each conduit, and I don’t believe the non-concentric knockout stipulation applies.
Code sections reviewed:
250.148, 250.96(A), 250.97 (for reference if it was over 250V), 250.92(B) (for reference if it were a service or over 250V),
At the minimum I feel that this installation is in violation of 314.30(D) due to lack of cover bonding. Though I don’t know because 314.30(D) points to 250.96(A) which says “…and other non-current-carrying parts that are to serve as equipment grounding conductors…”.
Scenario 2:
How does the all of the above change if a splice is made inside the pull box of one of the circuits due to replacing a section of that circuit further down the line?