Load calculation for school

[Sparky104]

I have never done a load calculation for a school, so I am at a loss as how to start this.
The school is 29,700 sq/ft.
The existing service is 400 amps 120/240v
They are adding 36 window A/C units and a kitchen with a walk in refrigerator, commercial dish washer, two convection ovens, and a steamer.
I've looked at some examples in the code, but I find it confusing.
Can anyone point me in the right direction, please.

 

[kwired]

I have never done a load calculation for a school, so I am at a loss as how to start this.
The school is 29,700 sq/ft.
The existing service is 400 amps 120/240v
They are adding 36 window A/C units and a kitchen with a walk in refrigerator, commercial dish washer, two convection ovens, and a steamer.
I've looked at some examples in the code, but I find it confusing.
Can anyone point me in the right direction, please.

I did similar project about a year ago. Added HVAC load and needed service upgrade because of it.

We got past demand data from POCO to use as a base, subtracted any HVAC load we were removing and then added the new HVAC load, threw in some extra "just in case" capacity also.

 

[Dennis Alwon]

I have never done a load calculation for a school, so I am at a loss as how to start this.
The school is 29,700 sq/ft.
The existing service is 400 amps 120/240v
They are adding 36 window A/C units and a kitchen with a walk in refrigerator, commercial dish washer, two convection ovens, and a steamer.
I've looked at some examples in the code, but I find it confusing.
Can anyone point me in the right direction, please.

You cannot do a load calculation without knowing what the existing load is. You either have to walk thru and get the amperage of all the equipment or put a monitoring device on for a period of time. After that you can add in the rest. I am surprised there is no engineer on the job to work this out. Try and see if the original plans were engineered. That may help

 

[Danelectron]

You cannot do a load calculation without knowing what the existing load is. You either have to walk thru and get the amperage of all the equipment or put a monitoring device on for a period of time. After that you can add in the rest. I am surprised there is no engineer on the job to work this out. Try and see if the original plans were engineered. That may help

Second that. There may be added loads over the years that affect the original calculations. The good thing is that all the existing loads can be assessed for present demand and the new stuff added on.

 

[kwired]

Second that. There may be added loads over the years that affect the original calculations. The good thing is that all the existing loads can be assessed for present demand and the new stuff added on.

And unless your existing is a lower capacity single phase meter, there is good chance your POCO can give you past demand data, but even newer electronic low capacity single phase metering may still be able to do that.