High school trailer

[hhsting]

I have high school that is going under construction so they have setup classroom trailer. The trailer is one room with ramps for with foundation to get in the trailer. The trailer electrical panel main breaker is fed from feeder breaker in Electrical shed located 70 feet away. Would NEC 2017 section 550 or any other article cover high school classroom trailer?

 

[tom baker]

What does the scope of article 550 cover?
In my state that type of trailer is considered a factory assembled structure.

 

[hhsting]

What does the scope of article 550 cover?
In my state that type of trailer is considered a factory assembled structure.

Well NEC 2017 version of 550 says mobile homes, manufactured homes that is used as dwelling unit. Basically anything that is home a dwelling unit would be covered by 550. Am I right Mr. Baker?

Ok so not 550 then 545? I am just trying to se which article school trailer would be covered under

 

[augie47]

Try Art 545

 

[hhsting]

Well NEC 2017 version of 550 says mobile homes, manufactured homes that is used as dwelling unit. Basically anything that is home a dwelling unit would be covered by 550. Am I right Mr. Baker?

Ok so not 550 then 545? I am just trying to se which article school trailer would be covered under

Hold on. I wrote too soon. Reading later parts of 550 see NEC 2017 section 550.4(A) says mobile homes other than dwelling unit but does not specifically mention school trailer are covered 550. School trailer is not dwelling unit. Whats the intent of 550.4(A)?

I am confused 550 or some other section?

 

[hhsting]

Try Art 545

Right but 550.4 cover mobile homes not intended as a dwelling unit such. So would not 550 cover the school trailer? Thats also not dwelling unit. If not then I don’t understand the intent of 550.4?

 

[hhsting]

I have high school that is going under construction so they have setup classroom trailer. The trailer is one room with ramps for with foundation to get in the trailer. The trailer electrical panel main breaker is fed from feeder breaker in Electrical shed located 70 feet away. Would NEC 2017 section 550 or any other article cover high school classroom trailer?

Also add to above the school trailer is relocatable. In my case it is moved from one site to this site. What are your opinions in my case I need disconnect within 30 feet of school trailer or not?

 

[augie47]

Sounds like it meetb the 550.4 Section. Is there a question involved ?

 

[mikeames]

Right but 550.4 cover mobile homes not intended as a dwelling unit such. So would not 550 cover the school trailer? That's also not dwelling unit. If not then I don’t understand the intent of 550.4?

My thought exactly. I was going to write exactly that and then re-read your post.

As per the definition this trailer does not meet the definition of mobile home because its NOT designed to be used as a dwelling. So 550.4 cant apply because its not a Mobile Home.

 

[hhsting]

Sounds like it meetb the 550.4 Section. Is there a question involved ?

Yea the main service switchboard is feeding panelboard in electrical shed call it X. The panelboard X feeds the school trailer panelboard located inside call it Y.

The distance from panel X to Panel Y is 70 feet.

First question:
I have service switchboard located remote but the trailer is being fed from cascade of feeders. Would this be acceptable or not?

Second question:

Do I need outside disconnect 30 feet from the school trailer within sight or inside panelboard is ok?

 

[hhsting]

My thought exactly. I was going to write exactly that and then re-read your post.

As per the definition this trailer does not meet the definition of mobile home because its NOT designed to be used as a dwelling. So 550.4 cant apply because its not a Mobile Home.

But that contradicts 550.4 which says mobile homes not intended for dwelling unit also apply to 550.

Mobile home definition is if it is used for dwelling homes the what is 550.4 talking about mobile homes not intended for dwelling unit?

 

[Fred B]

But that contradicts 550.4 which says mobile homes not intended for dwelling unit also apply to 550.

Mobile home definition is if it is used for dwelling homes the what is 550.4 talking about mobile homes not intended for dwelling unit?

Mobile home as in style of construction, The section give examples of what it means, some of the examples are: contractor office, banks, clinics, mobile stores. It also gives specific provisions of the remainder of 550 that it doesn't need to meet as not being a dwelling unit.
That said I could see an argument for 545 as well. Thus determination by AHJ might be searched out as there is significant enough difference between the 2 code sections to make a violation if "wrong" section was to be applied.

 

[hhsting]

Mobile home as in style of construction, The section give examples of what it means, some of the examples are: contractor office, banks, clinics, mobile stores. It also gives specific provisions of the remainder of 550 that it doesn't need to meet as not being a dwelling unit.
That said I could see an argument for 545 as well. Thus determination by AHJ might be searched out as there is significant enough difference between the 2 code sections to make a violation if "wrong" section was to be applied.

Just was asking experts opinion so that I can conclude myself which section to use being myself working for AHJ i dont know what other AHJs or experts opinions would be.

 

[Fred B]

Just was asking experts opinion so that I can conclude myself which section to use being myself working for AHJ i dont know what other AHJs or experts opinions would be.

The one at the location of installation.

 

[hhsting]

The one at the location of installation.

Dont follow?

 

[kwired]

I bet it has a nameplate, what does that it say it is?

There are jobsite office trailers that are rented out and are art 550 units. Such unit would also make great temporary classrooms. You can get them in single wide or there are multiple width options. I hooked some up a few years ago for wind farm construction temp offices, we had a few that were triple wide in that case, I see no reason there can't be unlimited number of open side units in the middle sections and make a pretty large building.

Each section got a separate feeder circuit to it.

 

[Fred B]

Dont follow?

The AHJ that is for the location of the mobile classroom set up and would be the one to inspect and approve the installation. Here in NY schools have their own regulations established by the dept of education, and doesn't always follow NEC, so all bets would be off as to what is allowed absent the input from that AHJ.
One NYS CODE reference calls the classroom trailer a manufactured building, from that one could infer that Article 545 would apply.

 

[kwired]

The AHJ that is for the location of the mobile classroom set up and would be the one to inspect and approve the installation. Here in NY schools have their own regulations established by the dept of education, and doesn't always follow NEC, so all bets would be off as to what is allowed absent the input from that AHJ.
One NYS CODE reference calls the classroom trailer a manufactured building, from that one could infer that Article 545 would apply.

mobile and manufactured homes or other no dwelling buildings under same definition will have a nameplate - the mobile homes especially will have one identifying it as a mobile home.

 

[hhsting]

mobile and manufactured homes or other no dwelling buildings under same definition will have a nameplate - the mobile homes especially will have one identifying it as a mobile home.

I dont have nameplate but just found out this is portable classroom and does not have wheels and it needs to be carried to new relocation on truck. Which should pit this on NEC 2017 section 545 no?

 

[Terminator5047]

I’d run 1-1/2 conduit to it feed it with 100 amps . Drive 2 ground rods bond the panel and frame and bond the stairs