250.56 Resistance of Rod, Pipe, and Plate Electrodes.
A single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of 25 ohms or less shall be augmented by one additional electrode of any of the types specified by 250.52(A)(4) through (A)(8). Where multiple rod, pipe, or plate electrodes are installed to meet the requirements of this section, they shall not be less than 1.8 m (6 ft) apart.
FPN: The paralleling efficiency of rods longer than 2.5 m (8 ft) is improved by spacing greater than 1.8 m (6 ft).
Check 250.32 for the ground rod. I dont know why he says two.
But it is tied in with the system from the house. Its not like your creating a separate system.
If that was required
then you wouldn't have a ground from the house out to the shed with the feeders.
If a sub panel in run to a detached garage is ground rods required at this location.
If a sub panel in run to a detached garage is ground rods required at this location.
the pool panel does not necessarily need a main breaker if you meet the 6 disconnect rule.
The panel would have to be service rated without a main and while I have seen such panels for large commercial use I don't think you will find a 'load center' that has a service rating without a main. Of course you could use a service rated disconnect ahead of the main lug panel. :smile:
do sub panels require grounding electrodes when used out side of a structure. thanks
Structure That which is built or constructed.
Every sub panel I use says suitable for service equipment. In fact, I have not seen a panel that does not say suitable for service equipment-- at least not recently.
Bob I will have to check on this... For years it was common practice to use a 12 cir. ML wp panel as a main service disconnect. These panel had 6 DP breakersDennis can you give us a model or a link that says it service rated without a main breaker?
Bob I will have to check on this... For years it was common practice to use a 12 cir. ML wp panel as a main service disconnect. These panel had 6 DP breakers
I just went looking at GE stuff and it looks like many of their load centers can be both main lug only and service rated. Kind of wish I knew that when arguing with Mike W about it on this forum. :smile: