Height minimum for overhead EMT

[Aleman]

I am trying to find minimum height for EMT used in an overhead outdoor run. This is a 120V 20amp circuit. I did see 225.18 where open conductors and cables below 600V require 10' height. I can't find where conductors in raceways are specified. Say if there were 2 structures, fenced in cages with roofs 8-10 high. Would it be compliant to run EMT across the gap between the 2 structures which is about 5'? The gap is not a thoroughfare or by any doors or gates or windows etc.

 

[DARUSA]

EMT Outdoor?

 

[infinity]

Wet locations are OK:

II. Installation
358.10 Uses Permitted.
(A) Exposed and Concealed. The use of EMT shall be
permitted for both exposed and concealed work.
(B) Corrosion Protection. Ferrous or nonferrous EMT, el-
bows, couplings, and fittings shall be permitted to be in-
stalled in concrete, in direct contact with the earth, or in areas
subject to severe corrosive influences where protected by cor-
rosion protection and approved as suitable for the condition.
(C) Wet Locations. All supports, bolts, straps, screws, and
so forth shall be of corrosion-resistant materials or pro-
tected against corrosion by corrosion-resistant materials.

 

[K8MHZ]

I think the issue is an open span running between buildings.

 

[steve66]

I believe you could install it at any height you wanted per code.

 

[north star]

= + =

"Would it be compliant to run EMT across the gap between the 2 structures which is about
5'?........The gap is not a thoroughfare or by any doors or gates or windows etc."

Yes, it is permitted [ RE:Article 358.30(A), `08 NEC ].
+ = +

 

[Cavie]

Outdoor is ok. It's gonna rust. It looks like hell but the NEC says it's OK.

 

[Aleman]

Thanks for the info guys. We have a lot of galvanized EMT outside where I work. It seems to hold up well.

 

[Ponchik]

EMT outside is fine. The life of the outside EMT depends on weather and the elements. My only concern is the transition to the buildings. IMO, when you have EMT between two structure the EMT couplings tend to separate over time because of the structure movement. But i guess in your case you can have one solid piece between the structure and not worry about midair coupling.

 

[Aleman]

EMT outside is fine. The life of the outside EMT depends on weather and the elements. My only concern is the transition to the buildings. IMO, when you have EMT between two structure the EMT couplings tend to separate over time because of the structure movement. But i guess in your case you can have one solid piece between the structure and not worry about midair coupling.

It's a short run no couplings. Besides plastic, what is the best outdoor raceway material?

 

[Ponchik]

It's a short run no couplings. Besides plastic, what is the best outdoor raceway material?

I wouldn't use PVC it will look like a dangling rope in couple of weeks. Just use EMT or IMC.