table 310.15(B)(7)

[kwired]

our department must insure the manufactures design we do not have the right to check their calculations.
It is different from state to state. Here no electrician has the right to change those calculations either

That is fine for the first sale and installation of such a home. Sometime later when you want to modify or add on, it no longer matters. Load calculations are necessary to see if existing service can handle added load, existing branch circuits may possibly be extended, removed, or new branch circuits may be installed.

Around here it is common to see manufactured homes placed over a basement. The basement is part of the entire structure when finished, but is field built and wired, but the manufactured home portion is same as it was when it left the manufacturer.

 

[david]

That is fine for the first sale and installation of such a home.

Currently this is the same here, but as I said, here you have to be act 158 certified to install or inspect a manufacture home installation. We will wait and see the end result of the bill before our legislators to see how it effects the rest of your post.

Sometime later when you want to modify or add on, it no longer matters. Load calculations are necessary to see if existing service can handle added load, existing branch circuits may possibly be extended, removed, or new branch circuits may be installed.

True but I am not saying load calculations are not needed, here you would turn to the manufacture for calculations for the manufactured home, you still would not turn to article 550 and do them on your own. Nothing you could come up with doing your own could make them less than what the manufacture called out. The additional calcuulations would be added to the exsisting ones.

Around here it is common to see manufactured homes placed over a basement. The basement is part of the entire structure when finished, but is field built and wired, but the manufactured home portion is same as it was when it left the manufacturer.

Here the load calculations for the manufactured home portion could not change. We would still have to provide a feeder( to the distribution panel installed by the manufacture) sized according to the manufactures instructions. The load calculations for the manufactured dwelling would be referenced and added to the total load calculations for the service.

If there are offsetting loads because of what you add to the basement those would be considered at the service not the feeder.

 

[George Stolz]

I think we've probably jacked this guy's thread far enough, but...

Code officials, operating under the Pennsylvania Uniform Construction Code, may not reject the manufacturers? approved designs or require review, approval or a seal by engineer or architect licensed in Pennsylvania.

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our department must insure the manufactures design we do not have the right to check their calculations.
It is different from state to state. Here no electrician has the right to change those calculations either

The sentence you quoted does not mean what you are saying. It protects PA people from having to pay an architect or engineer from PA to certify a drawing stamped at the factory in NE.

 

[david]

I think we've probably jacked this guy's thread far enough, but...



The sentence you quoted does not mean what you are saying. It protects PA people from having to pay an architect or engineer from PA to certify a drawing stamped at the factory in NE.

The state law makes it totally hands off as to who has authority (jurisdiction) over manufacture homes. It protects the federal fair housing act. No unexpected (additional) cost by a local authority looking at the design and feeling their needs to be some change made to meet code. No authority can reject one in their municipality or add special requirements that are aimed at discouraging mobile or manufacture homes as being a cost effective way of obtaining housing.

A local municipality used to only allow mobile homes if they had a block foundation. Not just a permanent foundation but a block one. If you look at the dead load design for some manufactured homes they do not meet the design requirements for other dwellings in this state.

They are federally or state sometimes both certified to be safe no building official has authority over them. Only the site work and utility connections can be inspected anything dealing with the manufactured home is protected by the fair housing act.

Because no building official has authority over the design or instalation of them the state enacted legislation requiring that any one installing or inspecting anything to do with them must have act 158 certification. This certification is to make it absolutely clear that the manufactures instruction must be followed.