Grounding

[william young]

Im currently wiring a farm house and their main disconnect of 200 amp is on the pole where it then splits off into 3 feeds, one to the house and 2 more runin to barns. Now i was installing a 200 amp breaker panel in their house and wondering if i would need to run a ground rod off of the breaker panel or would it be fine with the overhead wire runin from disconnect bout 100 ft away on pole.

 

[raider1]

You will need a grounding electrode at the house. Take a look at 250.32.

Chris

 

[romeo]

Grounding

You will need a grounding electrode at the house. Take a look at 250.32.

Chris

250.32(A) also 250.56

If you are using ground rods to meet the requirement you may need 2

 

[tryinghard]

Im currently wiring a farm house and their main disconnect of 200 amp is on the pole where it then splits off into 3 feeds, one to the house and 2 more runin to barns. Now i was installing a 200 amp breaker panel in their house and wondering if i would need to run a ground rod off of the breaker panel or would it be fine with the overhead wire runin from disconnect bout 100 ft away on pole.

What year code are you on? This is greatly affected in 2008.

 

[mdshunk]

What year code are you on? This is greatly affected in 2008.

Uh-huh. I'm going to start bumping into that pretty regularly now. It will require the triplex from the CD pole to be changed to quadraplex. I do that sometimes now anyhow, particularly if I need to upsize the drop anyhow.

 

[peter d]

Uh-huh. I'm going to start bumping into that pretty regularly now. It will require the triplex from the CD pole to be changed to quadraplex.

Can someone fill me in on this change? All outbuildings will now require a grounding conductor and an insulated, isolated grounded conductor? [No more grounded neutrals beyond the service disconnect?]

 

[C3PO]

Can someone fill me in on this change? All outbuildings will now require a grounding conductor and an insulated, isolated grounded conductor? [No more grounded neutrals beyond the service disconnect?]

Section 250.32(B)

 

[infinity]

Here's the 2008 wording:

250.32(B) Grounded Systems. For a grounded system at the separate building or structure, an equipment grounding conductor as described in 250.118 shall be run with the supply conductors and be connected to the building or structure disconnecting means and to the grounding electrode(s). The equipment grounding conductor shall be used for grounding or bonding of equipment, structures, or frames required to be grounded or bonded. The equipment grounding conductor shall be sized in accordance with 250.122. Any installed grounded conductor shall not be connected to the equipment grounding conductor or to the grounding electrode(s).
Exception: For existing premises wiring systems only, the grounded conductor run with the supply to the building or structure shall be permitted to be connected to the building or structure disconnecting means and to the grounding electrode(s) and shall be used for grounding or bonding of equipment, structures, or frames required to be grounded or bonded where all the requirements of (1), (2), and (3) are met:

The change no longer allows the grounding conductor to be bonded at the separate structure to grounded conductor.