A: I used this to ground a generator. They dont require it to be that deep for a generator but we get alot of storms and hurricanes and better to be safe then sorry. I would definitely recommend to bury a ground rod at least 4 ft. But that is just me. If you live in a higher storm area then I would go 6 ft. But ideally it is up to you I am the type to not leave it up to chance. Good luck
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A: 8' grounding rods for a house are there to ground the unbalanced electrical loads from your electrical panel. The 6" ground rod is not for electrical system grounding but rather static electric or lighting strike grounding. It is just there to have a way for momentarily electrical static to have a path to the ground.
A: Tom my knowledge that is not correct. A ground rod installed only 6 inches is never recommended for protection. If you desire to ground the structure, drive into the ground 8 feet.
A: The UL standard is 8’. In dry soil you will not get a good enough grounding cutting it half. If your soil has adequate moisture, THEORETICALLY you could cut it in half and drive two 4’ rods in the ground and join them at the top with a grounding strap and it would work just as well. Hope this helps. Side note, I’m not an electrician and use this information at your own risk.
A: No and yes. No and yes. Any legal grounding rod will be 8 feet long. Two grounding rods may be needed to support a residential load center (both 8 ft). (The length of rod and conductor sizing is located at 250.52(A)(5) in the 2017 National Electric Code (NEC).) [BTW, I'm not a licensed electrician, but a homeowner who is familiar with these codes. Recent NEC versions do not change these requirements. Since the requirements are based on safety, I might go beyond, but never less than required by code.]
A: No. You need to use the full length. Otherwise you WILL fail inspection.
A: Yes, as long as you tie them together. You can also run them diagonally and horizontal if its at least 18 to 24 in deep. Just more trenching. Some times the rocky soil makes it difficult to drive the whole 8ft or 10ft ground rods in. The deeper the better. However, as long as it has adequate ground coverage, you should be good.
A: According to the power company You are supposed to drive the whole rod into the ground.
A: Not an electrician, but these are perfect for grounding your building in my opinion. I would use two of them separated 6 feet apart with a continuous solid or stranded wire. I have installed about 4 or 5 electrical main panels and sub panels. I'm a DIYer and my work has been inspected by city inspector without issues. Just be sure to use the proper grounding lugs for the rods and tube/square depending on what your building is using. Also use some antioxidant when connecting aluminum to copper to prevent future oxidation or shorting. Hope this helps.
A: Solid copper would be expensive and an inefficient use of the precious metal. Copper coated zinc not only acts as a low impedance path to ground but also has the rigidity to withstand the driving force needed during installation.
A: One is all you really need. It goes by ground resistance. Most contractors will use two just to be safe. My house has 4 bedrooms, and I used one, and have been fine. Make sure if you use two that they are bonded together back to the panel.
A: It depends on your local code. My local compliance requires for me to use 2 separated 6 feet appart. Some municipalities require only 1, but I would do 2 just to keep it safe and prevent future issues/problems.
A: The question is not how many can be used but how many MUST be used. Two rods are recommended for your installation. A second ground rod is required if the ground resistance is greater than 25 ohms for one rod. Assuming you have no means to measure the ground resistance, just go ahead and drive a second rod. Two rods must be at least 6 feet apart, minimum. Better results are obtained by driving two rods 16 to 20 feet apart. There are some technical reasons for this placement but it is likely you do not care about that.
A: We use 2 in the state of NH to attempt to achieve 25ohms to ground.
A: I'm not an electrician -- but I don't see why you would need more than one ground rod. Grounding the electrical service for a house doesn't depend on number of bedrooms (for a normal house).