Mains wiring question (USA)

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EMT is sometimes called "thin wall" to differentiate it from "rigid", which is similar to iron pipe in dimensions and wall thickness.

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Hi John, Not really. Rigid is a lot thicker and harder to work with than EMT, but it lasts literally forever if not physically damaged. EMT will dent if you look at it sideways... ;-)

Charlie

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No it is not.

rigid is like water pipe..

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Actually, you don't need to look it at side ways for it to get dented, we get it delivered that way, or at least that's what the guys lead me onto believing!

No, emt is 1/16" thick and uses fittings, while rigid is 1/8" thick and is threaded.

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John F., there is significant wall thickness differences between EMT, IMC, and GRC. NOT the same. For more see NEC articles 358 EMT, 342 IMC, and 344 RMC. Or use your favorite search engine with the added info i just provided.

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Bob E seems to have left the discussion.I Hope he uses coded mAterials and the proper conduit for the run he is attempting.... The engineering machine seems to have gotten into a piss match with the inspector. I did get it's smarts revolving the serviced entrance being the location n use.Why did he even have to ask? Who runs bare Cable, UF or Romex over a wooden surface, wasn't it outlawed in the electrical safety code updates.

RR

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Specifically Romex, UF ect. for Exterior Locations is a No No.. The Exception being Temporary Wiring for Lighting et al. RR

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EMT is widely used in the electrical trade. It is adequate for almost all uses.

Rigid is not used very often.

There is conduit that is between rigid and EMT in wall thickness - IMC

- intermediate metal conduit. It is probably used more than rigid.

None of these need nail plates when they are near the edge of a stud. Neither dies rigid PVC conduit. Apparently the NEC considers them to be reasonable protection.

I don't see how any of these, in particular PVC or EMT, would be any problem in the OP's application.

It sure is, inside buildings. Once you go outside it tends to be RMC (aka GRC). Though rigid PVC (aka RNC) is quite common also.

My experience is different.

I hardly ever see that used.

If you want to get specific about the case i can look it up in my copy. I have 2005 here at home and 2008 at work.

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Randy Type UF cable, that is Sunlight resistant, is perfectly acceptable outdoors. It is very commonly used under decks, behind gutters & downspouts, and anywhere else were it's appearance is acceptable to the owner and it is not subjected to physical damage from such things as materials handling, lawn care equipment, motor vehicle movement and so fourth. Multi conductor type UF is only available as sunlight resistant so that is seldom an issue. Single conductor type UF is only intended for use underground or in raceway when above ground and is not presently manufactured in sizes smaller than four American Wire Gage. You are correct in saying that Romex, or any other brand of Type NM cable for that matter is not permitted outdoors but running it inside a roofing assembly does not make it an outdoor use.

-- Tom Horne

I see a lot more EMT on the outside of buildings than rigid, unless you are near the ground where the pipe may be hit by cars.

I seldom saw rigid on the construction projects I was on. It is good for some uses, like hazardous - gas stations, refineries....

Digging out a construction estimator, rigid is about twice the cost, installed, as EMT.

No need to look it up - I know what the NEC says. It is what gfretwell posted, which is the same as what I said.

-- bud--

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The usual good information from Tom.

The usual bad information from Randy, aka Proteus, aka Roy, aka Roy Quijano.

-- bud--

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Yawnnnn... oh Budkins get a life.., Everyone is Roykins to you. You sound just like the Trolls that accosted this group..He owe you something?

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I don't want to start a pissing match over this, but It is illegal for any outdoor use in major cities, you country folk and rural or suburban home owners wouldn't know this.

It is hilarious the way they drape it over the sides of their homes., like it is ok.

RR

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Actually I have it from good authority that they have Proteus on LockDown doing surveilannce on the ISS and some thermal imagery on some classified locations, probably not on earth... Roy is a mystery, as far as I know...best left alone unless you want to see hardcore G-men in action :)

RR

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OK. So don't start anything. Just site two major city codes, other than Chicago and environs which essentially forbid all cable, that forbid the use of exterior UF.

-- Tom Horne

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MR ROENTGEN ISN'T HERE ANYMORE PROBABLY HALFWAY THROUGH THA SKY GOING HOME AT THE MOMENT

TOM FOOLERY IS NOT YOUR STRONG SUIT STOP TRYING TO BE FUNNY I AM NOT A NEC CHEAT MACHINE

YOU HUMANS BREAK ALL SORTS OF RULES EVEN JUDICIIAL LAWS AND OTHER CODES OF CONDUCT IF YOU WANT TO KEEP USING UF OR ANY NM CABLE OUTDOORS ATTACHED AND RUNNING INTO YOU PROPERTY BARE AS IS THEN KEEP USING IT ON YOUR EXTERIORS IT IS YOUR PROPERTY VALUES THAT WILL DECLINE NOT MINE

I HAVE NOT SEEN ANY IN USE OUTDOORS IN BEVERLY HILLS CALIFORNIA NOR OTHER UPSCALE NEIGHBORHOODS IN YOUR US OF A WHETHER IT IS JUST GOOD TASTE CLASS OR ABIDING BY A CODE IS IRRELEVANT

IT SOUNDS LIKE YOU' ARE TRYING TO START SOMETHING WITH THIS QUESTION OR YOU JUST LACK GOOD TASTE

DON'T BOTHER ME AGAIN WITH THIS NONSENSE TOM IF I POST CODE INFORMATION FOR YOU EVENTUALLY EVERYONE WILL ASK ME TO POST RESPONSES WITH THE VIOLATED CODE INFO

IAP