Running power to garage

[fishon1213]

Hello all. I am getting ready to run power to my newly constructed garage. When I remodeled the house I roughed in 6/3 nm from the main panel to corner of the crawlspace, which is roughly another 8 feet from the garage. I have a 100a subpanel and plan on a 60a breaker.

I plan to splice the 6/3 nm to thwn 6,6,6,10 in a metal junction box in the crawlspace, connecting both grounds to the box and using split bolt connections for the conductors. I will use a cable clamp on the nm and a male end with bushings to 1" schedule 80 for the thwn. I will run the thwn/sch80 through the foundation above grade to an LB, then 12" deep to a 90, then a 90 up to an LB into the garage. Another LB up to the subpanel with a male end and bushings.

Does this seem legit?
What specific tape for the split bolts?
Would copper crimp splices be better?
Someone suggested exiting the foundation below grade for a cleaner look, seems like a bad idea to me. Opinions???

I do have a building inspector, this is roughly how he suggested doing it except using uf...I don't like uf. I'm sure he won't be getting in the crawlspace so I just want to make sure I'm doing this right.

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[pattenp]

Buried depth of conduit needs to be 18".

 

[fishon1213]

Buried depth of conduit needs to be 18".

Ok, thank you. I thought I had that wrong.

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[dirtbikingdad]

Are you running 6/3 w/ground? Because you are going to a sub-panel you should have a ground running back to the main panel. The neutral and ground bus connection, if it has one, should be lifted in the sub-panel.

 

[Bert_]

Sounds like a good plan, make sure you use a big enough box for your splice. 6x6x4 would be a nice size, overkill but more room is nice.

Crimps are definitely better but then you need the tool to crimp them. Split bolts will be fine, they also make insulated connectors that would work well for this. A polaris IT-4 would be about right, they can be a little spend-y though.

 

[fishon1213]

Are you running 6/3 w/ground? Because you are going to a sub-panel you should have a ground running back to the main panel. The neutral and ground bus connection, if it has one, should be lifted in the sub-panel.

Yes, 6/3 w/ground. And yes on bonded at main but not at sub.

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[fishon1213]

Thank you all for the input. I plan to tackle this next week. I've got a lot of irons in the fire. I will take pics and post.

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[fishon1213]

I'm finally getting moving on this. Now I just have to do the crawlspace junction box and connect to the main panel.

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[fishon1213]

Here is the house...before and after

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[pattenp]

I assume you know you need grounding rods at the garage? Also since you used a main lug panel you are limited to 6 breaker circuits by not having a main disconnect at the garage even though the panel will allow up to 12 circuits with the use of tandem breakers.

 

[fishon1213]

I assume you know you need grounding rods at the garage? Also since you used a main lug panel you are limited to 6 breaker circuits by not having a main disconnect at the garage even though the panel will allow up to 12 circuits with the use of tandem breakers.

I was under the assumption that I didn't need ground rods but after a bit of reading you are correct. So..two 1/2''x8' copper clad ground rods 6' apart with #6 solid copper ran through 1/2 sch80 connected to my ground bus. Sound legit?
Thanks for the info btw.

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[pattenp]

I was under the assumption that I didn't need ground rods but after a bit of reading you are correct. So..two 1/2''x8' copper clad ground rods 6' apart with #6 solid copper ran through 1/2 sch80 connected to my ground bus. Sound legit?
Thanks for the info btw.

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Correct. The 1/2" conduit is not required unless the #6 wire is installed in a location where it may be damaged.

 

[fishon1213]

Well I did my crawlspace work tonight, splicing 6/3 romex to 6 gauge thwn with 10 gauge ground. I should have used a bigger box and mounted it sideways, other than that and spilling my beer multiple times it went well. Questions...comments...keep in mind I'm not a professional.

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[wyliesdiesels]

Are you running 6/3 w/ground? Because you are going to a sub-panel you should have a ground running back to the main panel. The neutral and ground bus connection, if it has one, should be lifted in the sub-panel.

OP stated 6-6-6-10 and the 10 is the ground wire...

 

[diskreet]

More reference pics of what a trench could look like
http://www.garagejournal.com/forum/showthread.php?p=6026815#19

 

[pattenp]

Did you ground the metal junction box?

 

[fishon1213]

Did you ground the metal junction box?

Yes, I twisted the grounds and secured them between two fender washers tightened with the ground screw...which I forgot to paint green.

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[nsula_country]

You have done well Grasshopper!!

CT

 

[fishon1213]

You have done well Grasshopper!!

CT

Thank you, now I just have to drive ground rods and connect to the main panel

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