How to determine if the MDP is overloaded

[Electricalhelp]

Trying to determine if the MDP is overloaded.
The Main Bus has a 120/208V/3P 1000A Main Breaker.
There is also a sign on the right that says "Main Bus Modified to 1200 AMP Capacity...", which is showing 120/208V/3P 200A Breaker.
Please refer to the photo attached of the MDP.
I took the breaker size and took 80% of the breaker.
How can you calculate the MDP load without taking a meter to it for 30 days.
I attached my panel schedule for your reference.

 

[augie47]

Very odd you have a 1000 amp MB and a load of 1280

 

[xptpcrewx]

Trying to determine if the MDP is overloaded.
The Main Bus has a 120/208V/3P 1000A Main Breaker.
There is also a sign on the right that says "Main Bus Modified to 1200 AMP Capacity...", which is showing 120/208V/3P 200A Breaker.
Please refer to the photo attached of the MDP.
I took the breaker size and took 80% of the breaker.
How can you calculate the MDP load without taking a meter to it for 30 days.
I attached my panel schedule for your reference.

You can check the design documents.

 

[Electricalhelp]

Very odd you have a 1000 amp MB and a load of 1280

Hence why I'm trying to figure out how to calculate the MDP load correctly with the given breakers on the MDP

 

[electrofelon]

Hence why I'm trying to figure out how to calculate the MDP load correctly with the given breakers on the MDP

Honestly, I have never understood why people put the loads on a panel schedule. It is pretty much worthless information (except at the design stage of course). I would get the demand data from utility and go from there.

 

[xptpcrewx]

Honestly, I have never understood why people put the loads on a panel schedule. It is pretty much worthless information (except at the design stage of course). I would get the demand data from utility and go from there.

It’s not worthless. How else are you going to document the load? The problem is people don’t maintain their records every time something is added or removed. With up to date schedules, the OP wouldn’t have an issue.

 

[Terminator5047]

Put a logging meter on it for a week or two

 

[xptpcrewx]

Put a logging meter on it for a week or two

Not acceptable per Article 220. Need at least 30 days at maximum load conditions if demand load isn’t available for 1 year.

 

[Terminator5047]

Not acceptable per Article 220. Need at least 30 days at maximum load conditions if demand load isn’t available for 1 year.

Then do it for 30days

 

[electrofelon]

It’s not worthless. How else are you going to document the load? The problem is people don’t maintain their records every time something is added or removed. With up to date schedules, the OP wouldn’t have an issue.

I get away from NEC calcs as soon as possible. Typically for me this after the plan review and inspection process. Except for some specific applications, NEC calc values are almost meaningless. I prefer to go off of my experience, actual load readings, or demands data.

 

[xptpcrewx]

I get away from NEC calcs as soon as possible. Typically for me this after the plan review and inspection process. Except for some specific applications, NEC calc values are almost meaningless. I prefer to go off of my experience, actual load readings, or demands data.

What jurisdiction are you in? Permitting and inspection is almost always required. Especially for anything above 800-amperes.

 

[electrofelon]

What jurisdiction are you in? Permitting and inspection is almost always required. Especially for anything above 800-amperes.

I am in 2 very different jurisdictions. Central NYS where this is practically no permitting (nor licensing), and the Seattle area which has plan review for anything 400 amps and over.