How Many Ground Rods For Temp Service
- #one
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 past 1 additional electrode of any of the types specified past 250.52(A)(4) through (A)(8). Where multiple rod,
piping, or plate electrodes are installed to come across the requirements of this section, they shall not exist less than i.8 m (six ft) autonomously.
How does your jurisdiction treat that code section? Do they crave a second rod whenever a single rod is required?
When I write the correction, I e'er spell out the give-and-take "feet" equally in "a minimum half dozen feet away from the first rod"
I notwithstanding become these:
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jar546
Chief Cook & Bottlewasher
- #4
For service changes and upgrades or new installations that don't have rebar in the footer, we always see 2 footing rods because of the same reasons stated above. 1) Not many have the equipment necessary to test and 2) Those that practice take a difficult time getting 25 ohms or less with our soils.
Here is a short story that I will make long.
I was always under the impression that if you had a water pipe that qualified as a grounding electrode, and then if you added a rod outside, that was the 2nd electrode IF you could not prove the 25 ohm rule. In my niggling head, nosotros had 2 grounding electrodes and since the water pipage was larger and longer and tied into a system underground, it was the main grounding electrode and the single rod added as the supplemental for the 25 ohm rule. I was corrected in person past Michael Johnston who sits on a few CMPs.
Of form, me beingness me, I had to question him and I asked: "So let me get this straight. If I have a house that has a plastic water main coming in and plastic pipage through out, I take to take 2 basis rods and concur. But, you are telling me that if I have a metal water pipage that is considered a grounding electrode, I accept to add ii rods (if I don't meter the i) in addition to the water pipe?". His answer was "Yes, that is the intent."
I honey to learn right from the source when possible. It make the humbling feel more than endurable.
- #6
Water ice said:
Each and every time. At a temp pole, remote edifice, service, or any identify that a rod, pipe, or plate electrode is installed except as outlined in 250.54. The 2011 cycle cleared this up quite a bit past requiring 2 rods plain and uncomplicated (250.53(A)(2).
Ice said:
Bonding of metallic water pipes comes from a unlike part of Commodity 250 than the installation of electrodes. The bonding of common cold to hot metal water pipes is not found in the NEC.
- #ten
It doesn't take much to get a license in California. Nearly of what I come across is some guy passing himself off as a licensed electrician. A lot of it is a full general contractor that hires anybody that doesn't have burnt fingers to practise electric piece of work.
This was presented equally a water pipage bail. They were serious.
This had a full general contractor behind it.
I had nothing to do with this task until they requested a final inspection. The job card had approvals through lath. All that was left was a final.
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jar546
Chief Cook & Bottlewasher
- #14
Hither in Pueblo Colorado we have very dry out soil with poor conductivity. Past default the inspectors out here require ii 8' rods driven a minimum of 6' autonomously.
How Many Ground Rods For Temp Service,
Source: https://www.thebuildingcodeforum.com/forum/threads/2-ground-rods.8993/
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