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#1
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Subpanel Grounding Question
Hello all,
Just mounted my 70 amp subpanel on my garage wall. My question is: Do Subpanels need to be grounded with their own separate ground rod. I remember someone saying that a 100 amp or above does but not if less then that. Obviously the panel will be grounded through the feeder cable. |
#2
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Subpanel Grounding Question
wrote in message oups.com... Hello all, Just mounted my 70 amp subpanel on my garage wall. My question is: Do Subpanels need to be grounded with their own separate ground rod. I remember someone saying that a 100 amp or above does but not if less then that. Obviously the panel will be grounded through the feeder cable. Whoever told you that was wrong. Amperage of the panel does not change the ground requirements. Is your garage attached? If yes, then you do not need to add ground rods. Run a 4-cable feeder to the sub from the main and pull ground through that. Make sure that ground and neutral are not bonded in the sub. Remove the bonding strap from the neutral bar. If your garage is not attached, then you need to add ground rods. |
#3
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Subpanel Grounding Question
Thanks J.A.
The garage is detached so I will install the ground rod tomorrow with #6 copper. I already bought 10/3 UF and am going to start trenching and running 1" conduit in the morning. I understand the neutral bus bar issue but never was able to understand why the bonding screw is to be removed. If neutral and ground are bonded at the main panel why is it bad to bond them at the sub? Don't worry...I will separate them but am just curious. Rod |
#4
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Subpanel Grounding Question
On May 24, 7:53 pm, wrote:
Thanks J.A. The garage is detached so I will install the ground rod tomorrow with #6 copper. I already bought 10/3 UF and am going to start trenching and running 1" conduit in the morning. I understand the neutral bus bar issue but never was able to understand why the bonding screw is to be removed. If neutral and ground are bonded at the main panel why is it bad to bond them at the sub? Don't worry...I will separate them but am just curious. Rod If they are bonded together at the subpanel then the neutral current will be split evenly between the neutral and the equipment grounding conductor between the subpanel and the main panel. The equipment grounding conductor is not suppossed to carry current under normal conditions. |
#6
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Subpanel Grounding Question
On May 25, 8:56 am, Wayne Whitney wrote:
On 2007-05-25, wrote: I already bought 10/3 UF and am going to start trenching and running 1" conduit in the morning. Since you are using 10/3 UF are you going to be putting a 30 amp main breaker in your 70 amp subpanel? Cheers, Wayne Good catch. I was focused on the grounding question. 10/3 would make a pretty useless subpanel. |
#7
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Subpanel Grounding Question
"Eric9822" wrote in message Good catch. I was focused on the grounding question. 10/3 would make a pretty useless subpanel. Why? It runs all my power tools with no problem at all, including a tablesaw and dust collector together. Sure, bigger is better, but when I ran mine there were other considerations that made 10/3 an easy choice at the time. |
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