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Old 11-11-2006, 05:13 AM   #1
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New 200amp Service


Hello DIY's!!

Installing 200amp undergorund service for my home. Would like to know what size of wire needed to run from new 200amp service panel to meter base. Next question (ground plate or use ground rod) How deep should i go.



Last edited by xman74; 11-12-2006 at 06:23 AM. Reason: No replies
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Old 11-12-2006, 06:58 AM   #2
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200 amp service is either 4/0 aluminum or 2/0 copper.

I dont know where you got the idea for ground plate, most places we use two ground rods and also ground the metal water line where it enters the house. The ground plate may be a local thing, either required or a much better idea due to soil conditioins.

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Old 11-12-2006, 07:06 AM   #3
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I dont know where you got the idea for ground plate, most places we use two ground rods and also ground the metal water line where it enters the house. The ground plate may be a local thing, either required or a much better idea due to soil conditioins.
Nope, he got the idea for the ground plate from the National Electrical Code. It's been in there for 50 years or more.

250.52 Grounding Electrodes.
(A) Electrodes Permitted for Grounding.
.
.


(6) Plate Electrodes.
Each plate electrode shall expose not
less than 0.186 m2 (2 ft2) of surface to exterior soil. Electrodes
of iron or steel plates shall be at least 6.4 mm (14 in.)
in thickness. Electrodes of nonferrous metal shall be at least
1.5 mm (0.06 in.) in thickness.

250.53 Grounding Electrode System Installation.
FPN: See 547.9 and 547.10 for special grounding and
bonding requirements for agricultural buildings.

(A) Rod, Pipe, and Plate Electrodes
Where practicable,
rod, pipe, and plate electrodes shall be embedded below
permanent moisture level. Rod, pipe, and plate electrodes
shall be free from nonconductive coatings such as paint or
enamel.



Last edited by mdshunk; 11-12-2006 at 07:09 AM.
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Old 11-12-2006, 09:06 AM   #4
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Thanks for the code lesson mdshunk, but what I was saying is that rarely do you see or hear of anyone mentioning one where conditions allow the use of the much easier to install ground rods.

Unless local soil conditioins requred this extra work, I for one cannot see the reason to install it.
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Old 11-12-2006, 10:20 AM   #5
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In Ontario ground plates are used very often. One plate 3 feet down or two rods 10 feet apart.
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Old 11-12-2006, 10:39 AM   #6
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... but what I was saying is that rarely do you see or hear of anyone mentioning one where conditions allow the use of the much easier to install ground rods.
Driven many ground rods?

There are many locations where the local geology precludes the use of ground rods. We often speak of "ground rods" generically, using it instead of the more broad term "grounding electrode", which can be many different things besides rods.
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Old 11-12-2006, 11:45 AM   #7
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Driven many ground rods?

There are many locations where the local geology precludes the use of ground rods. We often speak of "ground rods" generically, using it instead of the more broad term "grounding electrode", which can be many different things besides rods.
As far as having driven many ground rods, the answer is easily up in the hundreds. I used to do residenial work before I move up to controls and industrial/commerical work. In fact I did several services a week for over five years back when I was a helper, and guess who gets the sledge hammer.

The point I am making, that you seem to want to ignor, is that it is too much work to dig a hole big enough for a plate, when soil conditions will permit a ground rod to be driven.

Since the OP mentioned plate electrodes, he likely to live in one of those areas where they are in fact a better idea.
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Old 11-12-2006, 12:06 PM   #8
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The point I am making, that you seem to want to ignor, is that it is too much work to dig a hole big enough for a plate, when soil conditions will permit a ground rod to be driven..
No, I'm not ignoring your point at all. Some localities we know that a ground rod cannot be driven. Some localities we're just not sure... it's hit and miss. You obviously worked in an area in which the geology allowed for ground rods to be driven all or most all of the time. Lucky you. Move somewhere else, and ground rods become a much less attractive option. The simple fact that a DIY person even mentioned a plate electrode in his post causes me to immediately believe that they are in local use in his area, and that's why he has knowledge of this more obscture grounding electrode type. Wouldn't you say? It doesn't matter anyhow. There are lots of approved types of grounding electrodes listed in 250.52. I could care less what a fella uses. Bury your old John Deere tractor and use that, if it pleases you.

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