200 amp service split between two meters- ground/bond…

[Postonbones]

A twin meter can is being used to replace a single meter can. The 200 amp service will feed the two meters ( line side). Load side of the each meter to feed two separate disconnects ( one for each meter). Question i have is when i attach the EGC to the two disconnects. Is an EGC required for the meter main also? I assume the ECG for each disconnect to the ground rod will feed back through the neutral ( line side) but i’m a little unclear. One set of rods with two ECG drops for each disconnect and no ECG drop for the meter main.

 

[Little Bill]

Is the twin meter can a meter main?
The conductor to the rods is not an EGC, an EGC is Equipment Grounding Conductor.
The term is GEC, Grounding Electrode Conductor, that connects to the rods.

 

[Postonbones]

My fault. I did mean grounding electrode conductors.
The two meter main sockets are fed by the utility triplex. A quick drawing is attached showing the basic setup and configuration. I’m assuming the GEC for the two disconnects is all that is needed but again i’m not

 

[LarryFine]

Ahead of the enclosure containing the main disconnect, there is no EGC. Meters and other metal enclosures are bonded to the neutral. The premises EGC system begins in the main disco.

Many localities, the POCO and/or the AHJ, do not allow landing GECs in the meter enclosure. I usually find it simpler to land a GEC in each main.

Note that you have a two-gang meter base and two separate mains. These are 2g meter/mains:

 

[Alexis Enrique]

Ground electric conductor goes to the meter cans, bonded to neutral. From meter can to Main disconnect I always use PVC, just hots and neutral (if you run any EGC here it needs to be the same size as your neutral)

 

[augie47]

Ideally you would bring your GEC from a point ahead of your two disconnects but if you need to come from the disconnects you could run one GEC from each disconnect or a common GEC & tap an individual GEC from each as illustrated below

 

[Little Bill]

Ground electric conductor goes to the meter cans, bonded to neutral. From meter can to Main disconnect I always use PVC, just hots and neutral (if you run any EGC here it needs to be the same size as your neutral)

You don't run the EGC until you leave the main disconnect. Also, the EGC size is not based on the neutral size, it's based on the OCPD.
In the case of a meter-main, that is the main disconnect.

 

[Postonbones]

If i’m following this correctly. From the meter mains ( load side) to the top of each disconnect I land the neutral and L1/L2. Leaving the bottom of the disconnects I land the Equipment grounding conductor ( one for each disco.). Attached to the grounding electrodes. So a three wire out of the meter main to the top of disco and then a four wire at the bottom of the disco with the green screw attached to each disco.

 

[Alexis Enrique]

You don't run the EGC until you leave the main disconnect. Also, the EGC size is not based on the neutral size, it's based on the OCPD.
In the case of a meter-main, that is the main disconnect.

I haves seen many times wires (green) running from meter can to the main disconnect (and they are incorrect called EGC) and base the size of this green wire on the OCP, this wire is not need, my point on their need to being the same size is you run it, is they are actually running parallel to the neutral, if that's the case, "size matter"

 

[Alexis Enrique]

If i’m following this correctly. From the meter mains ( load side) to the top of each disconnect I land the neutral and L1/L2. Leaving the bottom of the disconnects I land the Equipment grounding conductor ( one for each disco.). Attached to the grounding electrodes. So a three wire out of the meter main to the top of disco and then a four wire at the bottom of the disco with the green screw attached to each disco.

To meter can: from utility L1,L2,N
To meter can: Ground electrical conductor (from electrodes)
To Main #1 From Meter Side #1: L1,L2,N
To Main #2 From Meter Side #2: L1,L2,N
To Load Center 1 From Disconnect #1: L1,L2,N + EGC (bonded to neutral)
To Load Center 2 From Disconnect #2: L1,L2,N + EGC (bonded to neutral)

 

[Little Bill]

To meter can: from utility L1,L2,N
To meter can: Ground electrical conductor (from electrodes)
To Main #1 From Meter Side #1: L1,L2,N
To Main #2 From Meter Side #2: L1,L2,N
To Load Center 1 From Disconnect #1: L1,L2,N + EGC (bonded to neutral)
To Load Center 2 From Disconnect #2: L1,L2,N + EGC (bonded to neutral)

In meter-mains, the bond is already there. You don't bond again in the load center, they should be kept separate.
Even if you had a stand alone meter, then a disconnect, the bond would be in the disconnect, not in the load center.

 

[Alexis Enrique]

In meter-mains, the bond is already there. You don't bond again in the load center, they should be kept separate.
Even if you had a stand alone meter, then a disconnect, the bond would be in the disconnect, not in the load center.

He shows separate units on his drawing, correct bonding at main disconnect for wires leaving the main.

 

[Little Bill]

He shows separate units on his drawing, correct bonding at main disconnect for wires leaving the main.

He mentioned meter-mains and I didn't look at his drawing.
Glad we're clear!