Suppling power to a detatched garage from the house pane

[sbradley71]

When adding a 100A service to a detatched garage from a house, what depth do I need to bury the conduit if I am crossing the house service to get to the garage? Is it to code if I use Schedule 40 PVC in the ground and Schedule 80 with the wall runs above ground? My code book is at work and I do not do this often enough to be up with the code on it.

 

[jimwalker]

Re: Suppling power to a detatched garage from the house pane

In general 18 inches cover if in conduit
if under driveway i think it is 2 feet
If this has OCD from house i don't see needing sch 80
how are you crossing the service?
service underground ?

 

[electricman2]

Re: Suppling power to a detatched garage from the house pane

18 inches under 1 and 2 family dwelling driveways where used only for dwelling related purposes.

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

It is not going under a driveway. It is in the back yard and is crossing above to house service (which is also in underground conduit) at approximately 45 degrees. What is OCD?

 

[jimwalker]

Re: Suppling power to a detatched garage from the house pane

OCD=BREAKER
I think your good to go unless someones knows any reason you can't cross utility.They should be about 3 ft but be carefull.Have seen times when someone unthinking grades the yard and has reduced the covering

 

[pierre]

Re: Suppling power to a detatched garage from the house pane

In NYState and NJ, you are required to call for a utility survey before you dig, this way you will be sure of the path of the underground service and other utilities to the property.

Pierre

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

I was helping a home do-it-yourselfer and we have already powered the garage up. We only went about 12" but the homeowner is going to fill the yard in with about 6-12" of fill/topsoil around his garage anyhow. We used #2 AWG conductors with #3 AWG common and #6 ground but I think we could have went with #3 AWG conductor and common with a #8 ground. If I had it to do over, I would have went with 1-1/2" pipe instead of 1-1/4" pipe. 90's were an exciting pull.

 

[jimwalker]

Re: Suppling power to a detatched garage from the house pane

I never go min on pipe ,just not worth the extra work.Do hope you drove a grd rod at the garage.
Don't forget your job is unfinished untill that fill dirt gets there.I am sure your not using it yet and breaker is turned off. LOL

[ January 01, 2004, 10:26 PM: Message edited by: jimwalker ]

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

I wanted to drive a ground rod but when we told the electrical supplier we were going only 30', he didn't feel it was needed and the owner went with that. I know a seperate dwelling needs it's own ground but I am not licensed in this state and was only helping the friend out. Thank you for all of your input. Is the pipe large enough for that amount and size wire? What would you have used.

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

But of course.

 

[pierre]

Re: Suppling power to a detatched garage from the house pane

Bradley
How did you connect the grounded and equipment grounding conductors to the panel? The person in the supply house gave you incorrect information about the groundrod, I would not consult that person for any more information. One should be careful when helping a 'friend' do work, especially when one does not know how to perform the task at hand. I will bet you learned more than your friend did

Pierre

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

Probably, but nothing I have helped install has caused a fire yet. I tied to ground and the neutral to the house's existing ground/common strip. There are many things that are not up to code with this house.

 

[jimwalker]

Re: Suppling power to a detatched garage from the house pane

Wonder if that supply house sells code books.Big orange has something better than code book.They have that DO IT YOURSELF BOOK .
Tell your friend to go buy that rod

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

Jim,

I will. Thanks. Am I correct that you still have to have the common and the ground tied to the house as well as to the ground rod? I had my master electrician license about 5 years ago and let it run out beause I didn't do many installations like I intended at first (And it wasn't because of the complaints on my work). I am just one of those electrical engineers. Please overlook me and thanks for the help.

Scott

 

[jimwalker]

Re: Suppling power to a detatched garage from the house pane

at the house asuming it is service and not a sub they are together (seperate lugs)at that new sub panel neutral and grd are seperated.Needs a main breaker in garage too if there are more than 6 throws.Do assume you used gfci receptacles.
I too allowed my masters to exspire.Pobably will retest and activate.Have no desire to do more than service work.The profit in new houses is too low to even bother with.

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

There is a 100A sub breaker on the house panel and a 100A main breaker in the garage. But the two grounding/neutral bars are connected together in the garage panel, so how do I seperate? Remove the jumper and use one bar for ground and one bar for neutral. That is how I would think even the house would need to be also. Is that code?

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

We did use GFCI's for the first receptacle after the breaker on each circuit.

 

[jimwalker]

Re: Suppling power to a detatched garage from the house pane

Thats kool the rest will be protected on the load side.Do take the time to test them.

 

[hurk27]

Re: Suppling power to a detatched garage from the house pane

sbradley71

Is the house panel fed from a disconect switch? If so then yes it would have to be kept seperate. as with the sub panel. But there is an exception to this If you fed the sub panel in the garage with H,H,N. and there is no other metal paths between the house and garage (water,gas,phone,cable) that can become a parallel path for the neutral then you can but the neutral and grounding and the electrode must be bonded together at the sub. But if you have fed this panel with 4-wire then you must keep the neutral and grounding seperate. and and removeing that jumper is one way to do it as long as the manufacture allows it. and if your going to have more than 6 circuits It will need a main breaker for means of disconnect.

[ January 02, 2004, 01:46 AM: Message edited by: hurk27 ]

 

[sbradley71]

Re: Suppling power to a detatched garage from the house pane

The service comes directly from the meter into the 200A load center breaker for the house and the house has ground and neutral bonded together in the load center, which is what I continued out at the garage sub-panel. As stated before, the garage does have a main 100A breaker.