What type of conduit outdoors along wall?

secutanudu

I plan to install a subpanel in my garage this week to run some power tools. Since the area between the garage and main house is on a slab (breezeway), the only real easy way to run the wires is to have the conduit go out side along the edge of the house. I don't like the idea, but it will be pretty well hidden (see the green line in the pic below).

Can I use Sch. 40 PVC conduit here? Or do I need 80?


Second question...I assume my garage is considered "attached". Am I right? I hope so, as I want to leave the existing 20A circuit and would rather not drive ground rods.

Thanks.

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Andrew

Colomboj

You could do PVC but over the years you will notice it starts to sag. I would run emt and use compression connectors if your dead set on running it on the wall. Personally I would run it underground or thru an attic space if at all possible.

You should drive 1 ground rod at the sub panel and do not bond the sub either.

Jim Port

I would consider your garage attached.

I would think Sch 40 PVC would be fine and it is easy to work with.

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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.

secutanudu

There's no attic space accessible without tearing apart my kitchen wall. No basement under the slab. No way to go underground, patio in the back, driveway in the front. Wall is the only real option,though not desirable. It'll be pretty well hidden by the gray siding. I can even box it in later if it's ugly.

Thanks for the help.

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Andrew

Jim Port

Additional grounding at an attached structure is not needed.

The OP does not have enough length to worry about sag.

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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.

secutanudu

Just to make sure I'm reading the chart correctly:

For a 60A feeder (55A or less calculated load) I can use 6/3 NM. Then transition to THWN for the outdoor side (three #6, one #10).

If I use THHN/THWN the whole way, i can go up to 65A (70A breaker). Is that right?

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Andrew

SD515

Yes Andrew

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Kyle

Just because you can, doesn't always mean you should

brgmgb

You may want to check with the inspector. Our garage is attached via an enclosed breezeway (unheated old back porch) which we expanded to reach the garage. In my county, the garage was considered unattached because of the breezeway - even though I can walk from my kitchen through the breezeway to the garage without ever being exposed to the elements.

ddawg16

That is a good point.....I think that because your garage does not share a wall with your house, it might be considered detached.

Why not underground? It's actually pretty easy to run conduit under a slab....make a probe with a piece of PVC....hook the water hose to one end....glue a cap on the other....drill some holes....drill right through the dirt. It's actually kind of fun....especially if you have kids....they love the mud.

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