Garage sub-panel wiring

[jeff48356]

In a detached garage, would a sub-panel be required to have its own ground rod driven into the ground next to the garage? If so, what is the reasoning for this? How would a sub-panel in a garage be different from any other sub-panel in the house? The one in the garage is fed with four conductors (black, red, white, ground).

 

[ActionDave]

Yes 250.32 requires separate structures supplied by feeders to have a grounding electrode.

 

[Howard Burger]

two rods or ufer

two rods or ufer

You'll also find a relatively recent post on this forum discussing this question, and that two ground rods are needed (or a ufer if you can get in when the foundation is poured).

 

[Cleveland Apprentice]

Why 2 rods if you can show 25 ohms or less with one?

 

[ACE1970]

for the cleveland apprentice

for the cleveland apprentice

do some reading art.250.32a each building or structure requires a GES 250.32b1 neutral must be isolated to prevent a fault going upstream to main panel so thar the GES takes a fault directly to ground.

 

[jwelectric]

do some reading art.250.32a each building or structure requires a GES 250.32b1 neutral must be isolated to prevent a fault going upstream to main panel so thar the GES takes a fault directly to ground.

Would you explain what you mean here?

 

[Volta]

do some reading art.250.32a each building or structure requires a GES 250.32b1 neutral must be isolated to prevent a fault going upstream to main panel so thar the GES takes a fault directly to ground.

You probably mean so the GES can help direct lightning hit energies more directly to ground, don't you? And that it helps to stabilize to system voltage to the local ground potential?

 

[infinity]

Why 2 rods if you can show 25 ohms or less with one?

If 25 ohms or less you would only need one but how would you do that in a cost effective manner?

 

[Cleveland Apprentice]

do some reading art.250.32a each building or structure requires a GES 250.32b1 neutral must be isolated to prevent a fault going upstream to main panel so thar the GES takes a fault directly to ground.

I know the neutral must be isolated.

 

[Little Bill]

I know the neutral must be isolated.

That's about the only correct statement from that post.

 

[Twoskinsoneman]

Would you explain what you mean here?

That would be the "electricity always seeks the easiest path the ground" folly.

 

[ACE1970]

That would be the "electricity always seeks the easiest path the ground" folly.

in layman's terms there you go. Pardon me about my spelling. Since I had a grammatical error. In there I was using my phone.

 

[roger]

in layman's terms there you go.

Forgetting the layman, what do you say?

Roger

 

[ACE1970]

Forgetting the layman, what do you say?

Roger

I say that Jack seems to be the smartest one here. Yapp

 

[roger]

I say that Jack seems to be the smartest one here. Yapp

So you are telling us that you stand behind the following statement?

neutral must be isolated to prevent a fault going upstream to main panel so thar the GES takes a fault directly to ground.

Roger

 

[Twoskinsoneman]

I say that Jack seems to be the smartest one here. Yapp

This is certainly the case, however.....

That would be the "electricity always seeks the easiest path the ground" folly.

I identified this statement as folly, not supporting your original statement below.

the GES takes a fault directly to ground.

In fact relatively little current will flow on the GEC during a ground fault.

 

[AK GUY]

Did you run an equipment grounding conductor with the feeders to the garage? If so drive a ground rod and isolate the grounded conductor from the grounding conductor. If not drive a ground rod and bond the grounded conductor terminal to the grounding electrode conductor. Also the garage is required to have a main disconnect.

 

[Hendrix]

drive a ground rod and bond the grounded conductor terminal to the grounding electrode conductor. Also the garage is required to have a main disconnect.

Huh :thumbsdown:

 

[Twoskinsoneman]

The one in the garage is fed with four conductors (black, red, white, ground).

Did you run an equipment grounding conductor with the feeders to the garage?

This info is available in the OP.