understanding 230.85 /225.41 amd 225.42 grounding and bonding.

[Necnerd]

I don't do much residential anymore and I'm trying to understand how to label and do my grounding/bonding for my the electrical system emergency disconnect for a single family dwelling fed by feeders.

This is a farm house. the utility supplies a meter and service disconnect at a pole about 75 ft from the house.
there is a 200amp main lug panel fed with four wires from the service disconnect on the utility pole.
this main lug panel feeds another 100amp panel on the outside of the house.

since the house is fed with feeders I would use 225.41 and label the 100 amp panel on the outside of the dwelling emergency disconnect.

does the service disconnect at the pole also need to be labled emergency disconnect, service disconnect?

im assuming my grounding and bonding would all be the same.

the poco provided meter/ service disconnect would need to have a gec connected to two ground rods and have the grounded/ grounding conductors bonded

the 200a main lug panel on the back side of utility pole fed with four wires would have grounded and grounding conductors isolated

the 100a main disconnect panel on the outside of the dwelling fed with four wires would have grounded and grounding conductors isolated. Because this is a seperate structure i would require one more ground rod at this location.

the dwelling has a metal undergroundwater piping system where the main line comes in. can i bond this anywhere on the metal water pipe back to the sub panel ground bar? 250.104(3) i would size the bonding jumper using 250.102(c) looks like if the panel is fed with 1/0 i can get away with running #6 copper to the water pipe?

I really appreciate all of you in this forum and would like to thank anyone in advance who replies or offers any input! hopefully I'm understanding the nec correctly and have a solid plan... thanks again!

 

[Necnerd]

Drawing

 

[infinity]

does the service disconnect at the pole also need to be labled emergency disconnect, service disconnect?

No it's not an emergency disconnect it's the service disconnect.

the poco provided meter/ service disconnect would need to have a gec connected to two ground rods and have the grounded/ grounding conductors bonded

Yes, normal service disconnect rules would apply, GEC connection, MBJ, etc.

since the house is fed with feeders I would use 225.41 and label the 100 amp panel on the outside of the dwelling emergency disconnect.

Yes.

the 200a main lug panel on the back side of utility pole fed with four wires would have grounded and grounding conductors isolated

Yes.

the dwelling has a metal underground water piping system where the main line comes in. can i bond this anywhere on the metal water pipe back to the sub panel ground bar? 250.104(3) i would size the bonding jumper using 250.102(c) looks like if the panel is fed with 1/0 i can get away with running #6 copper to the water pipe?

No, since it qualifies as an electrode the connection needs to be within 5' of where it enter the structure. The correct table for a GEC is 250.66.

 

[infinity]

does the service disconnect at the pole also need to be labled emergency disconnect, service disconnect?

No it's not an emergency disconnect it's the service disconnect.

the poco provided meter/ service disconnect would need to have a gec connected to two ground rods and have the grounded/ grounding conductors bonded

Yes, normal service disconnect rules would apply, GEC connection, MBJ, etc.

since the house is fed with feeders I would use 225.41 and label the 100 amp

Drawing

panel on the outside of the dwelling emergency disconnect.

Yes.

 

[Necnerd]

Thank your for clarifying I really appreciate the help!

So because the metal water pipe is considered an electrode I need to make the connection within 5ft of it entering the dwelling using 250.66.

the house emergency disconnect is fed with 1/0 largest ungrounded conductor.

I should be able to run #6 from


building or structure disconnecting means enclosure where located at the building or structure

Equipment grounding conductor run with supply conductors

One or more grounding electrodes- the ground rod at the emergency disconnect on the outside of the house?

Or do I have to get 6 all the way out to the service disconnect at the pole?

 

[Necnerd]

I would also need to install an I interbonding system on the 100amp emergency disconnect on the outside of the house?

 

[tortuga]

I would also need to install an I interbonding system on the 100amp emergency disconnect on the outside of the house?

Yes when your replacing a grounding electrode system (GES) on an existing dwelling with existing communications systems ( CATV / Phone / satellite / random antennas ) those grounds should be moved to your new GES. There should be only one GES per structure, if any of the communications utilities drove their own little ground rod as they tend to do abandon that in favor of your new grounding system.

 

[Necnerd]

Yes when you’re replacing a grounding electrode system (GES) on an existing dwelling with existing communications systems ( CATV / Phone / satellite / random antennas ) those grounds should be moved to your new GES. There should be only one GES per structure, if any of the communications utilities drove their own little ground rod as they tend to do abandon that in favor of your new grounding system.

I don’t see anything from cattv/ phone/ satellite thankfully, but when they add it they will have a place to connect…

As far as the metal water pipe electrode, does it need to go all the way back to the service disconnect or can I make the connection at the three listed locations from post 5?

 

[tortuga]

As far as the metal water pipe electrode, does it need to go all the way back to the service disconnect

Since your drawing shows the service disconnect at another structure, and a GES is per structure so no.

or can I make the connection at the three listed locations from post 5?

If a large voltage difference develops between two grounding electrodes I don't want current flowing thru the electrical system to reach another electrode. Mike has some old videos on this discussing manufacturers that were advising people to add extra ground rods at their machines. The same concept applies to using the electrical system to connect electrodes.
I think its best for all bonding wires that make up a grounding electrode system; wires to the ground rod , water pipe electrode and inter system bonds land on a common busbar, but its not so much a 'code' concern and I think the way you drew it up your plan meets code.