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
Whoever told you that was wrong. Amperage of the panel does not change the
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
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.
On May 24, 7:53 pm, rodney email@example.com wrote:
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
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
I agree with Edwin.
All I ran to my detached garage was 10/3 wg, used a 60 amp, 4 circuit
subpanel and a 30 amp breaker in the main box.
That would handle anything I wanted to use since I don't weld.
How many tools can one guy use at one time???
I dunno. When I ran a subpanel in my attached garage, I ran it as a full
100A sub, with #4 AWG,
the works. I figured I'd just overdo it from the start so I would not have
to redo it later. However, I agree with you.
10/3 wire in a garage sub would be more than enough garage power for most
He missed a violation, it happens. Perhaps he just decided you will
never use the 85a the #4 is good for but it still is not really legal.
A lot of people mis-apply 310.15(B)(6). It is onlky for the main
feeder or service conductors to the whole dwelling. That assumes the
load diversity you have in a home.,
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