Power to shed

[Redwolf947]

Hey all,

I want to run power from my garage to my 10x16 storage shed.

I only need a few outlets to power battery maintainers. I want an outside motion light for security, and an indoor light to find stuff in the dark.

I'd like to run a multi-wire branch circuit example = one neutral, and two opposing hots on a common trip 20a double pole breaker. one branch for lights the other for outlets.

From the garage sub panel I was planning on 40' of 12/3 NM-B to a junction box then 25' of 12awg THHN wires red black white and green (because I have it already) in 3/4" Flexible Non-Metallic Liquid-Tight conduit buried 12" to 18" deep to the shed then another junction box here I would run 12/2 NM-B to the lights and outlets. All wire properly attached to or run thru studs with proper staples/clamps.

Now the questions..

Can I use a multi-wire branch circuit as my 1 one circuit to the shed so I don't need a sub panel or ground rods.

How does one run the Liquid-Tight conduit from the LB on the house? looking around I haven't seen any PVC ones that are threaded. An explanation of this one would be appreciated. I've done a lot of wiring but not too much to outbuildings

At the shed can I just enter with the Liquid-Tight conduit thru the sil plate under the back corner of the shed? Caulked/clamped in of course.

Can I use the NM-B in the stud cavity's of the shed for my circuits?

Should I use GFCI for the supply breaker($104.00 ouch)? Or is there a cheaper way? maybe one GFCI outlet before the lights and the one gfci first for the outlets.

Anything I'm forgetting? any suggestions? Thanks..

 

[pattenp]

As far as I know you're good on everything but the depth of the buried feed needs to have 18" of cover and no GFCI needed on the feeder, use GFCI outlets. No ground rods needed if just the one circuit. Also the flex conduit is okay for the buried run, personally I'd use rigid conduit. NM-b is fine for the wiring in the shed. Multiwire branch feeder is okay and no sub-panel is okay.

Edit: Put in a disconnect where the feed comes in the shed. You can use a simple flip switch such as this... http://www.homedepot.com/p/Leviton-...mmercial-Switch-Ivory-R51-0CSB2-2IS/202027031



*

 

[Redwolf947]

Thank you pattenp.

Any info on the liquidtight fittings used for this?

 

[wyliesdiesels]

Thank you pattenp.

Any info on the liquidtight fittings used for this?

U need a threaded female adapter:

LT connector into the adapter then short piece of PVC between adapter and LB...

 

[Redwolf947]

So I'm going to have to buy a chunk of rigid conduit anyway.. I'll just run it all in that will cost less anyway.. Thanks tho wyliesdiesels

 

[Redwolf947]

Again thank you both for your answers...

Another question.

I don't want a junction box that close to the floor in the garage. Can I put in a sharp 90 or something at the level the LB enters the garage and run conduit up to the junction box? I want to have the junction box the same height as my outlets (approximately 4') but I don't want to run the LB that high outside of the garage. I plan to insulate and cover the walls someday. I will put a blank plate on this junction box for future access.

Also what type of rigid PVC should I run? sch 80 all the way? sch 80 for above ground runs then sch 40 for the elbows and underground run? sch 80 for the elbows and above ground runs with sch 40 for under ground run? the over all run is around 25' including the 4' up the wall in the garage and in the shed. thanks for any input..

 

[pattenp]

You can use a 90 ell if it will fit within the wall depth. If you use a tight 90 you may find it hard to get the wire through. As to the sch of the PVC conduit, use sch 40. You only need sch 80 if the conduit is installed in a location that it's subject to damage. Such as the outside above ground piece if you think you may run into it with a riding mower.

 

[Redwolf947]

Thank you again pattenp. The walls are 2x4 I'll see what works I guess.

 

[Redwolf947]

Can I use a 3/4" PVC Pull Elbow in place of a 90 ell? Also can I put in a 30-Amp 240-Volt Two-Pole Indoor Light Duty Safety Switch? note: the Circuit breaker will be a 20a double pole.

 

[Redwolf947]

You can use a 90 ell if it will fit within the wall depth. If you use a tight 90 you may find it hard to get the wire through. As to the sch of the PVC conduit, use sch 40. You only need sch 80 if the conduit is installed in a location that it's subject to damage. Such as the outside above ground piece if you think you may run into it with a riding mower.

I wont hit it with the lawn mower but some one else might

 

[Redwolf947]

Can I use a 3/4" PVC Pull Elbow in what will eventualy be an enclosed wall?

 

[pattenp]

You can use a 30A safety switch if you are talking about using it for the disconnect. Also conduit bodies that have a cover that can be removed are not to be buried in a wall. You should leave access to it.

 

[theoldwizard1]

Forget conduit. Just bury 12/3 UFB. Use a schedule 80 plastic sweep where you transition from underground to above ground. Run it into a fused A/C disconnect box where you can split it into 2 separate circuits.

I did this in my garage. One circuit, protected by a 15A cartridge fuse is for lighting and use 14/2 Romex. The second circuit is protected by a 20A cartridge fuse is for equipment and uses 12/2 Romex.

 

[oldadjustablewrenchnut]

Hey all,

I want to run power from my garage to my 10x16 storage shed.

I only need a few outlets to power battery maintainers. I want an outside motion light for security, and an indoor light to find stuff in the dark.

I'd like to run a multi-wire branch circuit example = one neutral, and two opposing hots on a common trip 20a double pole breaker. one branch for lights the other for outlets.

From the garage sub panel I was planning on 40' of 12/3 NM-B to a junction box then 25' of 12awg THHN wires red black white and green (because I have it already) in 3/4" Flexible Non-Metallic Liquid-Tight conduit buried 12" to 18" deep to the shed then another junction box here I would run 12/2 NM-B to the lights and outlets. All wire properly attached to or run thru studs with proper staples/clamps.

Now the questions..

Can I use a multi-wire branch circuit as my 1 one circuit to the shed so I don't need a sub panel or ground rods.

How does one run the Liquid-Tight conduit from the LB on the house? looking around I haven't seen any PVC ones that are threaded. An explanation of this one would be appreciated. I've done a lot of wiring but not too much to outbuildings

At the shed can I just enter with the Liquid-Tight conduit thru the sil plate under the back corner of the shed? Caulked/clamped in of course.

Can I use the NM-B in the stud cavity's of the shed for my circuits?

Should I use GFCI for the supply breaker($104.00 ouch)? Or is there a cheaper way? maybe one GFCI outlet before the lights and the one gfci first for the outlets.

Anything I'm forgetting? any suggestions? Thanks..

everything seems ok. they do make threaded pvc. make sure no water will enter the conduit you use use weather proof fittings covers. I would use 2 gfci outlets in the shed and add the light to one. feed with 20/20 on separate phases.

 

[6768rogues]

My electrical inspector told me that if the conduit is outside or buried, liquid tight or not, it was a wet location and THHN was not allowed. I tried to argue that the conduit was liquid tight, and he said condensation would cause moisture in the conduit. Oh well, at least I asked before I did the work so I used THWN.

 

[Redwolf947]

My electrical inspector told me that if the conduit is outside or buried, liquid tight or not, it was a wet location and THHN was not allowed. I tried to argue that the conduit was liquid tight, and he said condensation would cause moisture in the conduit. Oh well, at least I asked before I did the work so I used THWN.

Luckily the wire I have is dual rated THWN and THHN..

But thank you for getting me to check

 

[Redwolf947]

everything seems ok. they do make threaded pvc. make sure no water will enter the conduit you use use weather proof fittings covers. I would use 2 gfci outlets in the shed and add the light to one. feed with 20/20 on separate phases.

Welcome to GJ oldadjustablewrenchnut. Thank you for your reply and First post..

I just bought all the conduit and hopefully all the fittings I'll need. Menard's didn't have the 90 Ell I bought the pull elbow but before I assemble I'll try to get the right one or I'll make the elbow accessible when I close up the walls in the garage.

I got a 3/4"-10' sch 40 piece and sch 40 elbows, and LB, I also got a 3/4 -10' sch 80 piece for the pipe that comes out of the ground to the LB. I plan to have a slab poured in the future and this may end up in the concrete rather it be sch 80. I can still run twelve 12awg wires in this pipe from what I read.

I ended up with the 20A two pole switch one leg (phase) for lights, the other for outlets. I'm going to hard wire my lights thru a second set of switches off the first so no GFCI for lights. I will put in 5 outlets. The first outlet on that circuit will be a GFCI.

If the rain holds off I'll be digging my 20" deep trench to my shed. I'm still trying to figure out how to punch a hole thru the gravel pad?

Pictures to come soon.

 

[pattenp]

Buried conduit over time is going to have water settle in it because of condensation. That's why it's considered a wet location. Wire used in it needs to be rated for wet locations such as THHN/THWN, XHHW, RTH, USE, UF. Most THHN is now dual rated also being THWN. As a side note, USE only rated wire is not to be installed inside of the structure, it needs to be terminated outside.

 

[Redwolf947]

Well I got this done awhile ago and I'm finally going to post a follow up. I seem to be missing a few pics so I'll take some more.. To get started I dug my trench first. As if you've never seen a trench here ya go..

View media item 51651
View media item 51652
As you may recall i was trying to figure how to punch a hole thru the gravel pad. Here's how I did it. I drilled the hole thru the bottom plate/floor of the shed under where the box for the switch was going.(note: I dug under the pad leaving earth under the gravel)

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View media item 51653
I cut some sharp notches on the end of a short scrap of conduit. I put that thru the hole I drilled and tapped the conduit with a hammer while turning the pipe. This cut a clean hole to the trench.

I left that scrap in the hole until i had the conduit layed out.

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View media item 51656
You'll see 2 cans one is the solvent and the other is glue I bought this as a set for electrical conduit..

View media item 51657
Well to go further I'll need to take a few more pics.. More to come...

 

[LS6 Tommy]

Looks good, Redwolf! I wanted to do the same until I found out by adding more than just an outlet and light my shed would be considered "living space" so I would have to pull construction permits, electrical permits and have my taxes go up...

Tommy

 

[Redwolf947]

Thanks LS6. Hope to have more pics this week. The electrical end of the project is all done and I like the results.

 

[Norcal]

My electrical inspector told me that if the conduit is outside or buried, liquid tight or not, it was a wet location and THHN was not allowed. I tried to argue that the conduit was liquid tight, and he said condensation would cause moisture in the conduit. Oh well, at least I asked before I did the work so I used THWN.

A bit late but the inspector is correct any UG or outdoor conduit is a wet location.

 

[bczygan]

everything seems ok. they do make threaded pvc. make sure no water will enter the conduit you use use weather proof fittings covers. I would use 2 gfci outlets in the shed and add the light to one. feed with 20/20 on separate phases.

Welcome to GJ, oldadjustablewrenchnut!

Please put your location in your profile, and thank you for making your first post, one that helps a fellow member.

Bill

 

[Redwolf947]

Well life's been busy and I can't find the pictures I took but here's the final look of the sch. 80 leaving the exterior of the garage to the shed. I ran 12/3nm from my panel to a junction box then the proper red black white and ground 12 ga wire thru the conduit to a 4 way switch that's my disconnect in the shed I then ran one wire to the interior light and the other to a few outlets .. Working great!! If I can I'll post a few more pics..View media item 69468