Shipping Container Converted to Mobile Field Office

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jumper said:
Yes, if main breaker is 100 or 125 the feeder can match.

I would not really be too concerned about future loads. It is a small unit and HVAC is already being installed. Future loads can be served by whatever source is feeding the unit.
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Its very small. I don't see more than 20-30 amps at any one time of peak draw.

Just wanted my stuff to be good so no one could say I did a poor job.

I think we are good to go now. I will just install a label outside requiring a 4 wire feed and OCPD no greater than my Main. I will keep N & G seperate like you said I need to do outside.

Thanks a lot for guidance on the particulars of this install. Much appreciated!
 
I will still draw up my original plan.

For production units, I am using a genny set and MTS instead of outside panel, but I will draw yours up too.

Also always try and up sell the units with temp poles.
 
jumper said:
I will still draw up my original plan.

For production units, I am using a genny set and MTS instead of outside panel, but I will draw yours up too.

Also always try and up sell the units with temp poles.
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I would love to have each drawing for my files. Many thanks!
 
Study the definition of building and structure. All buildings are structures, while not all structures are buildings. Also study what grounding and bonding are and their purpose. Go even further and study equipment and system grounding.

There is a lack of information on your part here. First is this a new service? Is this a sub feed? Is this a 120v branch? If you answer 1 or 2, you will still need to install a grounding electrode system.

Also remember that any equipment fastened to a footer that contains a grounding electrode is most likely auxiliary and optional.
 
IMG_8622.jpg

Iphone turned picture sideways. Maybe a Mod can fix it.

Does that hat hold down kit look like it's seated properly?

Siemens
 
LarryFine said:
You mean the red piece? I'd have to pull on the breaker to tell,
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Yep the red piece.

I've never had to use a hold down kit so I tried to follow directions

insert--rotate--press breaker on to tabs--etc

did not give it a test pull after installation.
 
Also, why does a back fed Main need to be held down?

If the red plastic snaps into place and holds the breaker down how does one remove the breaker?

What is a likely danger if a hold down kit is not used?
 
So I did a little research and from what I read the need for a hold down on a backfed breaker is to keep it held it place when the breaker handle is turned off.

Also to keep the breaker from inadvertently being removed from the bus bar and having exposed energized prongs in the open.
 
Actually, it's the stab-on slots that would be energized, not the exposed stabs. I think the concern is arcing from being dislodged while energized.
 
DBoone said:
So I did a little research and from what I read the need for a hold down on a backfed breaker is to keep it held it place when the breaker handle is turned off.

Also to keep the breaker from inadvertently being removed from the bus bar and having exposed energized prongs in the open.
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I think another part of it is to clue-in the person working on it. i.e. if s/he turns off that breaker and pulls it off the busbar the terminals will still be live, unlike any other breaker in the panel.

As best I can tell you've install it correctly as well, although like Larry I'd have to pull on it to be sure.
 
LarryFine said:
Actually, it's the stab-on slots that would be energized, not the exposed stabs. I think the concern is arcing from being dislodged while energized.
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Sorry Larry, I used wrong terminology. I meant the exposed slots on the breaker would be energized, not the exposed stab.

Now that I know the reasoning behind needing a hold down, sure doesn't seem to be a big concern.
 
jaggedben said:
I think another part of it is to clue-in the person working on it. i.e. if s/he turns off that breaker and pulls it off the busbar the terminals will still be live, unlike any other breaker in the panel.

As best I can tell you've install it correctly as well, although like Larry I'd have to pull on it to be sure.
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You would think that there would be enough clues that a qualified person would know if a panel is back fed and know which breaker is back fed.

I don't really like this hold down because you can't see it installed because I have a double 60 installed across from it. It hides the plastic clip so someone can't see it and know what's going on. Plus honestly the instructions could have been a little clearer.

Give me a strap with a screw. Quick and easy.

I may run by and give the breaker a tug but now that I know the "why" I'm not overly concerned.

Appreciate the help.
 
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