Dave as often happens you lose me, I really have a hard time following you.:huh: It would really help me if you could be concise and on point.
Since we are talking about electrical provisions I would say a manufactured trailer with an electrical system including electrical supply provisions.
Is it your feeling that any trailer on a job site is a job trailer and therefore 550 applies?)
No, but I took it that we were discussing the typical office type job trailer.
What do you make of the first few lines of 550.4?
I would look at 550.4 in two parts
Part one:
?A mobile home not intended as a dwelling unit ? for example, those equipped for sleeping purposes only, contractor?s on-site offices, construction job dormitories, mobile studio dressing rooms, banks, clinics, mobile stores, or intended for the display or demonstration of merchandise or machinery ? shall not be required to meet the provisions of this article pertaining to the number or capacity of circuits required. It shall, however, meet all other applicable requirements of this article
?if? provided with an electrical installation intended to be energized from a 120-volt or 120/240-volt ac power supply system.?
Part two:
Where different voltage is required by either design or available power supply system, adjustment shall be made in accordance with other articles and sections for the voltage used.
I would glean from that and other portions of the code that the typical mobile home would be the one designed to be used as a single family dwelling.
Would never be supplied by a 480/277 volt supply.
I would recognize that a manufactured mobile home that was designed to be used as a dwelling could be placed on construction site and be used as a job trailer.
I would also recognize that this section addresses manufactured mobile homes supplied by 120/240 volt systems that did not have all the provisions or circuitry that would qualify there use as a single family dwelling could likewise be used as a job trailer on a construction site.
I would also recognize that 550.4 addresses manufactured mobile homes that could be supplied by other voltage systems such as 480/277 though not specifically called out in this section the supply voltage on these manufactured mobile homes was not limited to 240/120
Then I would struggle with the scoping provisions of 550.1
And then I would go to 550.4 (C) from that I would recognize that article 550 recognizes that manufactured mobile homes that are designed to be supplied by other voltage configurations like 480/277 were not intended to be covered by article 550
I would be left to conclude 550.4 only addressed manufactured mobile homes not intended to be dwelling units because of circuitry and other dwelling provisions where being manufactured as offices, clinics, job trailers and so on. when supplied by 240/120 volt sytem
I would go back to 550.1 and struggle with how I get from 550.1 to include 550.4 .
To me that means a structure that meets the definition of a mobile home and has been built as a mobile home.It does not mean that an office trailer with a tag that says manufactured building on it has to be treated as a mobile home. Do you agree or disagree with that? :huh:It would really help me if you could be concise and on point.
The problem with that is each state can regulate what is or is not tagged as a manufactured building
From the hand book commentary article 545
?Manufactured homes are built on a chassis and installed on site with or without a permanent foundation. Manufactured buildings are generally constructed within a factory or assembly plant and then transported to the building site.
They are not built on a chassis and are designed to be installed on a permanent foundation. ?
It would be my position that article 545 manufactured buildings are designed to be installed on a permanent foundation. the code cannot be concerned with what each stae individually does