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Topic: Page Two
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Lee Krugerud
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Aug 2017
Lee Krugerud (Wise River, Montana, US) says...

I HAVE 200 amp service to our house, outside at the meter we have two 100 AMP Breakers below the meter, these are grounded with 4 ga wire to two grounding rods, 6 feet apart. There are two sets of underground wires coming into the house, each set goes to a separate breaker box. THESE BREAKER BOXES ARE NOT GROUNDED. Is grounding at the meter adequate or should the breaker boxes be grounded as well

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Ryan
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Dec 2016
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Ryan says...

Lee, it sounds like you have two main disconnects and two sub-panels, completely legal if the main disconnects are fed from one meter and the installation is done correctly. Basically the main disconnects outside would be installed and grounded just as you described. There would then be four conductors (two un-grounded, one neutral, and one ground, either in a cable or a conduit) going into the sub-panels inside. It would look something like my tutorial that starts here: http://wireyourownhouse.com/panel/subpanel1.html

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Angela
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Jul 2017
Angela says...

I want to say thank you very much for sharing your knowledge!

I'd also like to ask if you (or your web maintenance person) might be able to add a "Back" or "Previous" button at the bottom of each page - if that is possible.

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Ryan
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Dec 2016
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Ryan says...

Thank you Angela! While I did program the website myself, I am no website guru. I'm sure there's an easy way to use some method and add a "Back" button to all the pages, but I don't know it offhand. I'll do some research and see what I can find out. The site was hand written and programmed, so it's not as simple as just telling a program to do it for me. If I have to manually add a code snippet to every page, that's a lot of work, as there are a ton of pages! Thank you for the suggestion though, and I'll look into it.

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Angela
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Jul 2017
Angela says...

I want to say thank you very much for sharing your knowledge!

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dale
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Jun 2017
dale (Floyd Knobs, Indiana, US) says...

What is the maximum number of outlet boxes I can have on one breaker. In the bedrooms / or kitchens.

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Ryan
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Dec 2016
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Ryan says...

Thanks for the question Dale. The electrical code does not specifically limit the number of outlets in residential. As a general rule, it's usually ok to feed about 500 square feet of general rooms on one circuit with the required number of outlets. In the kitchen, unless you have an overly large one or you know you'll be using multiple appliances at once, you can usually split the two required small appliance circuits between all your outlets. If you really want to do a calculation, the commercial code assigns 180VA to each outlet. Using that, you could put 8 outlets on a 15 amp circuit (15*120*.8/180), or 10 on a 20 amp circuit (20*120*.8/180).

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Joseph
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Jan 2017
Joseph says...

I have a house that was built in the 1950s. It has over-head wiring coming from the transformer. The load box is connected to the service panel through the concrete wall and only three heavy duty wires are coming from it. Two black hot wires 120 each and one neutral. There is a pipe coming from the bottom of the load box outside that goes down into the ground. I am assuming that this is the grounding wire, but we know what they say about assuming. In the service panel the neutral wire is connected to a neutral bus at the top of the panel. The two black hot lines are connected to a 100 amp main break as there are no incoming terminals. All of the white neutral wires from the inside wiring are connected the neutral bus; seems appropriate. All of the aluminum and copper grounding wires go to a separate grounding bar; again seems correct. I cannot understand how this grounding bar is actually grounded as it is not connected to anything except inside wiring as far as i can see!?!?

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Ryan
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Dec 2016
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Ryan says...

Joseph,

First, is the neutral bar connected to the grounds or to the metal box in any way, or is it isolated and mounted on a plastic or other insulating material? Some of the older houses in that era did not use a grounded system and would connect a ground wire from various boxes throughout the house to the closest grounded object they could find. It sounds though, like you have grounds run to your panel. Do they appear to be original or added wiring?

If there is no grounding installed, and this is a main, not a sub-panel (it sounds like a main from your description but see the difference on my website under services), then you can add the two ground rods and connect them to your ground bar using a copper wire, #8 minimum for your 100A service. If it is a main, the neutral and ground bars need to be connected somehow, The best way to make sure would be another #8 between them.

If you had some good pictures it would help me.

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