One Line diagram and Load Schedule for 400amp residential house

[Alexis]

Hey!

I'm new to this forum. I'm studying the trade and working on my first project now. Have a few questions.. We are on the final stages and inspector requested one line diagram and load schedules. I never draw them before and here is my first attempt. Could you please tell me if it looks right?




This is 400amp house with 2 200amp sub panels on each floor. I'm also trying to figure out the correct AIC for my main beakers.. Supplier sold me two different ones 22,000 and 10,000 200amp breakers..

And here is the first draft for the load schedule:





What should I put in CONN KVA? Do I need to could all the sockets and all the lights for this one?.. Does everything looks right?

I really appreciate any feedback!

PS Please excuse my grammar, English is not my native language

 

[kwired]

Load schedule for a dwelling?

I think I would put something sarcastic in the load value for most of the general use circuits, there is no real accurate figure that can be put in most of them other then most of the time they will have little load, and occasionally they may have a moderate to heavy load.

 

[K8MHZ]

Is that panel wired as a sub? I have to take a closer look to tell.

 

[kwired]

No main breaker?

two 200 amp main breakers in the meter cabinet from what I am seeing.

 

[K8MHZ]

two 200 amp main breakers in the meter cabinet from what I am seeing.

I just noticed that and changed my post.

 

[Alexis]

Is that panel wired as a sub? I have to take a closer look to tell.

Yes, 2 panels on each floor.

Only 2 main breakers in the main panel. 400amp total service.

What do you think about the one line diagram? Does it looks correct?

We used AL 4/0 4/0 4/0 SER cable to feed each of the 200amp sub panels. And 500kcmil for the main panel feeder.

One ground rod bonded with metal concrete frame of the house and water bond.

This is my first Main panel installation.

 

[Smart $]

... What do you think about the one line diagram? Does it looks correct? ...

While there is a standard for one-line diagrams, it is only a standard if you "subscribe" to it as the standard. That said, the majority of the industry does not. What it really boils down to is whether it conveys the necessary information. Yours appears to though you need to proof it (spelling, format, etc.)

View attachment 17425

That's a lot of wasted tape. :blink:

 

[Ingenieur]

The single line is more of a riser
but that should be fine

I would build the pnl scheds in excel (or find on the net)
neater when typed
can do the math automatically

 

[shortcircuit1]

View attachment 17417

This is 400amp house with 2 200amp sub panels on each floor. I'm also trying to figure out the correct AIC for my main beakers.. Supplier sold me two different ones 22,000 and 10,000 200amp breakers..

AIC rating of a panelboard unless its mentioned on the panel is the lowest breaker AIC rating present in whole panelboard.For example if you have a main breaker with 42kAIC rating an your brach breakers rated at 22kAIC.Your panelboard AIC rating will be 22kA not 42kA. According to what i see there are two 200A breakers one with 20kA and other with 10kA.So your AIC rating of the panel will be 10kA not 22kA.

 

[GoldDigger]

AIC rating of a panelboard unless its mentioned on the panel is the lowest breaker AIC rating present in whole panelboard.For example if you have a main breaker with 42kAIC rating an your brach breakers rated at 22kAIC.Your panelboard AIC rating will be 22kA not 42kA. According to what i see there are two 200A breakers one with 20kA and other with 10kA.So your AIC rating of the panel will be 10kA not 22kA.

The one important exception to the rule you state is that if a particular exact combination of main and branch or feeder breaker is series-rated by the manufacturer based on testing, then you can keep the AIC of the higher rated main breaker.

(It actually applies to any series combination of that particular pair of breakers, not just where the higher rated is the main of a panel.)

 

[kwired]

Series ratings can matter, but in this case having both ratings as "mains" doesn't really make any sense.

If there is more then 10K available then the 10K breaker is a potential hazard.

If there is less then 10K available one may ask how much more the 22K breaker cost as it didn't need that higher rating, though code wise there is nothing wrong with it.

Add: since there is a service mast and presumably a service drop cable to supply it - chances are pretty high there is less then 10kA available fault current, unless the service drop is only say 10 feet long and the source transformer is right at the other end and is over 75 kVA. (which is pretty unlikely)