[diyergirl]

First time posting here- probably not the last as we have just started construction on a garage.



I will be doing the electrical and have a pretty good idea about what to do.

We will be pig tailing from overhead supply (per power company) and attaching new 200 amp meter socket (next to existing meter socket for the house).



From there, I will have SER run about 30' (18" trench/pvc conduit) through footing of garage. I plan on a ufer ground at the sub-panel.
I can't get OH service to garage because of trees or else I'd have a combo on the garage.



I have run a lot of the electrical in the house and everything is good. I keep second guessing myself for the panel/meter and want to be sure I'm doing it correctly. (I have an electrician who has offered to inspect but since I pulled the permit to do the work myself, he can not do the work.)


So, I guess I'm just asking if what I plan on doing makes sense and is to code (I've read about as much as I can of the code).



200A Meter Socket/Main

200A sub-panel

2-2-2-1 Cu in conduit in 18" trench

ufer ground at sub panel

grounding rod at meter-main

 

[rjniles]

SER is not rated for underground, conduit or not.

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[diyergirl]

Thanks- if I have the proper underground cable, does this seem correct?

 

[rjniles]

Use 4 single conductors rated for wet location.

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[rjniles]

Have you done a load calculation? Why 200 amps to a garage? Will your service support you plan?

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[Oldmaster]

You will need a disconnect for the garage and the house on the house. Your wire size to the garage is not correct size for 200 amp. You need to establish ground at both the garage and house.

 

[diyergirl]

We will have an apartment above the garage which is why we are going for 200amp. Will have HVAC, stove, water heater, etc. The power company will upgrade with incoming lines from the street to support another 200a - I was planning on a meter socket/main combo that has a disconnect as that is what the house has.

 

[rjniles]

HVAC, stove and water heater for an garage apartment does not need 200 amps. 100 would be plenty, probably 60 would work.

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[Let it Snow]

Use THIS Meter Base.

Buy a 320 amp meter base with dual 4/0 lugs. 400amp = 320 amp Continuous.
Both 200 Main Breaker Panels will run directly into the meter base, no need for a disconnect or four wire cable.

Run 4/0 SEU into the house's 200 amp main breaker panel.
If the SEU is more than 3ft long inside the house, you must install a 200 amp Main disconnect and run 4/0 four wire sub feed cable or conduit to the house's 200 amp sub panel.

Run three 4/0 XHHW Aluminun in 3" PVC conduit to the garage.
Use 36" radius sweep elbows and run the conduit directly into the 200 amp main breaker panel in the garage. Use Schedule 80 PVC conduit for the riser at each end to protect against physical damage.

Since this is new construction, you should be able to run the conduit under the garage footer and up the inside wall. This will eliminate the need for Conduit LB's.
Drive Ground Rods and Ground Plumbing at both buildings.

Talk to your inspector about this before you start or purchase material.
Also talk to the Power Company's Engineer and get approval.
I just did this exact setup and it worked very well.

Since this is overhead, run 500MCM XHHW in 3" conduit from the top of the meter to the point of the Power Company's attachment. Again, go over this wire size with your inspector before you start. He/She may permit 350MCM depending on the connected load.

 

[Oldmaster]

NEC 230: 72 Main disconnects must be grouped. You will need to install main disconnects. You also will need to run 4 conductors. 2017 code

 

[Let it Snow]

NEC 230: 72 Main disconnects must be grouped. You will need to install main disconnects. You also will need to run 4 conductors. 2017 code

Our area is still under the 2015 codes.

 

[Oldmaster]

It's in the 2015 code as well. I have the 2008 code and it's in there as well.

 

[Oldmaster]

The NEC is revised every 3 years. So there is no 2015 code, only 2014.

 

[Let it Snow]

The NEC is revised every 3 years. So there is no 2015 code, only 2014.

You're correct, Our locals are 2015

 

[Oldmaster]

Yeh. It's hard to keep up with it all. Right now I have 3 codes to consider when I do anything.Crazy