Grounding electrode system

[hhsting]

Attached sketch I have gas station canopy on top their is cell DC antennas, AC panelboards and equipment. The cell antennas, AC panelboards and equipment are fed from service disconnect on utility pole next to gas station canopy.

The cell antennas enclosure , AC panelboards enclosure and equipment enclosure is bonded to ground bus and ground bus is bonded to canopy steel on top of canopy. Please see attached sketch.

The main service disconnect attached to utility pole has grounding electrode conductor to ground rods. Attached sketch shows that their is bonding jumper from ground rod to ground bus which bonds canopy steel to ground rod.

Questions:

1. Canopy steel if qualified as grounding electrode should be or should not be bonded to as shown on sketch with bonding jumper between ground rods and ground bar/steel?

2. The bonding jumper connecting ground rods and canopy steel does it need to be in conduit or can it be insulated wire not in conduit?

3. Instead of bonding jumper between ground rod and ground bus/steel should their be another grounding electrode conductor connecting from service disconnect to the canopy steel directly?

4. Bonding jumper is connecting ground rods in ground. Can bonding jumper be buried in ground and bonded in the ground as shown on sketch? NEC 2014 say anything about it?

 

[hhsting]

Attached sketch I have gas station canopy on top their is cell DC antennas, AC panelboards and equipment. The cell antennas, AC panelboards and equipment are fed from service disconnect on utility pole next to gas station canopy.

The cell antennas enclosure , AC panelboards enclosure and equipment enclosure is bonded to ground bus and ground bus is bonded to canopy steel on top of canopy. Please see attached sketch.

The main service disconnect attached to utility pole has grounding electrode conductor to ground rods. Attached sketch shows that their is bonding jumper from ground rod to ground bus which bonds canopy steel to ground rod.

Questions:

1. Canopy steel if qualified as grounding electrode should be or should not be bonded to as shown on sketch with bonding jumper between ground rods and ground bar/steel?

2. The bonding jumper connecting ground rods and canopy steel does it need to be in conduit or can it be insulated wire not in conduit?

3. Instead of bonding jumper between ground rod and ground bus/steel should their be another grounding electrode conductor connecting from service disconnect to the canopy steel directly?

4. Bonding jumper is connecting ground rods in ground. Can bonding jumper be buried in ground and bonded in the ground as shown on sketch? NEC 2014 say anything about it?

Does canopy steel if qualified as electrode post #1 attachment need to be bonded to main service grounding electrode system? If yes then can their be bonding jumper from rods to ground bus bar to canopy structural steel or bonding jumper from rods and to canopy structure steel directly or grounding electrode conductor from main service disco to canopy steel?

 

[jaggedben]

Attached sketch I have gas station canopy on top their is cell DC antennas, AC panelboards and equipment. The cell antennas, AC panelboards and equipment are fed from service disconnect on utility pole next to gas station canopy.

The cell antennas enclosure , AC panelboards enclosure and equipment enclosure is bonded to ground bus and ground bus is bonded to canopy steel on top of canopy. Please see attached sketch.

The main service disconnect attached to utility pole has grounding electrode conductor to ground rods. Attached sketch shows that their is bonding jumper from ground rod to ground bus which bonds canopy steel to ground rod.

Questions:

1. Canopy steel if qualified as grounding electrode should be or should not be bonded to as shown on sketch with bonding jumper between ground rods and ground bar/steel?

The steel qualifies if it is 10ft in the ground. See 250.52(2).

2. The bonding jumper connecting ground rods and canopy steel does it need to be in conduit or can it be insulated wire not in conduit?

That bonding jumper is not required by the code (because there's a separate EGC with the feeder, if I read your notes correctly). It does not generally need to be in conduit, although it might need to be if subject to physical damage. See 250.64 (B).

3. Instead of bonding jumper between ground rod and ground bus/steel should their be another grounding electrode conductor connecting from service disconnect to the canopy steel directly?

No.

4. Bonding jumper is connecting ground rods in ground. Can bonding jumper be buried in ground and bonded in the ground as shown on sketch? NEC 2014 say anything about it?

Yes, it can be buried. No the 2014 NEC doesn't say anything about it.

 

[hhsting]

The steel qualifies if it is 10ft in the ground. See 250.52(2).




That bonding jumper is not required by the code (because there's a separate EGC with the feeder, if I read your notes correctly). It does not generally need to be in conduit, although it might need to be if subject to physical damage. See 250.64 (B).



No.



Yes, it can be buried. No the 2014 NEC doesn't say anything about it.

Your bonding jumper is not required because EGC is provided with feeder is something I find unusual. Yes feeder and EGC are in one conduit. However the feeder EGC goes into AC panelboard bus from there the panelboard ground bus is bonded to the enclosure and enclosure would be bonded to the ground bus shown attachment post #1 which then bonds the canopy steel the electrode.

So I don’t have one wire type EGC you see in between are things bus, enclosure. I am aware that NEC 2014 says equipment grounding conductor (EGC) shall not be used as grounding electrode conductor (GEC) unless exception however exception does not apply.

Would first paragraph last parts it goes thru so many things not fall under NEC 2014 Section 250.121 so EGC cannot be used as GEC?

 

[hhsting]

Your bonding jumper is not required because EGC is provided with feeder is something I find unusual. Yes feeder and EGC are in one conduit. However the feeder EGC goes into AC panelboard bus from there the panelboard ground bus is bonded to the enclosure and enclosure would be bonded to the ground bus shown attachment post #1 which then bonds the canopy steel the electrode.

So I don’t have one wire type EGC you see in between are things bus, enclosure. I am aware that NEC 2014 says equipment grounding conductor (EGC) shall not be used as grounding electrode conductor (GEC) unless exception however exception does not apply.

Would first paragraph last parts it goes thru so many things not fall under NEC 2014 Section 250.121 so EGC cannot be used as GEC?

To add to above I am not sure if bonding jumper to bond two ground electrodes cannot be used as EGC and can the bonding jumper in my case bond two grounding electrodes be other then wire type? NEC specifies main bonding jumper, supply side bonding jumper, system bonding jumper material but not regular bonding jumper

 

[jaggedben]

Your bonding jumper is not required because EGC is provided with feeder is something I find unusual.

Yes feeder and EGC are in one conduit. However the feeder EGC goes into AC panelboard bus from there the panelboard ground bus is bonded to the enclosure and enclosure would be bonded to the ground bus shown attachment post #1 which then bonds the canopy steel the electrode.

So I don’t have one wire type EGC you see in between are things bus, enclosure. I am aware that NEC 2014 says equipment grounding conductor (EGC) shall not be used as grounding electrode conductor (GEC) unless exception however exception does not apply.

They are separate structures right? See 250.32(B)(1).
Each structure has its own grounding electrode. They will be connected by the EGC run with the feeder, but that is not using the EGC as a GEC.

If the canopy steel support qualifies as an electrode then the wire from the ground busbar to the canopy steel is the GEC for that structure. If the canopy steel does not qualify then they need to provide a qualifying electrode at the canopy and run the GEC to it.

 

[hhsting]

They are separate structures right? See 250.32(B)(1).
Each structure has its own grounding electrode. They will be connected by the EGC run with the feeder, but that is not using the EGC as a GEC.

If the canopy steel support qualifies as an electrode then the wire from the ground busbar to the canopy steel is the GEC for that structure. If the canopy steel does not qualify then they need to provide a qualifying electrode at the canopy and run the GEC to it.

By separate structures do you mean the utility pole and the gas station canopy? They both are separated Not Joined.

Canopy is definitely structure but utility pole I am not sure is confusing if it’s structure or not per NEC 2014 section 100 structure. How do you say utility pole is structure?

 

[jaggedben]

I think it's pretty clear they are separate structures. Service equipment on a separate pole or pedestal is common and is usually treated that way. I agree the article 100 definition is not much help, but it basically says anything that is human-made (and fixed in place, I suppose) and not equipment is a structure. So it's totally common sense to say the pole is built, constructed.

If for some reason you decide that it is all one structure then the diagram looks fine because the rods are the grounding electrode system for the whole structure, and the bonding jumper only needs to bond the canopy steel. Which it does.