Having Trouble

[Ninja56]

I’m working on a project and have done well finding most of the tables and codes needed, but the panel info in a little unsure of. It’s 3 motors I need to provide a panel for. A 15 HP, 460vac 3 phase motor with an FLA of 17.3 and the FLC is 21. The other two motors are 40 HP, 460vac, FLA 48, FLC 52. Any help is appreciated. I need the following:
Panel size
Short circuit duty
Panel Ampacity
Main Breaker Size Protection

 

[augie47]

Based on 430.52 and taking inrush into account my first thought would be a 200 amp panel.
Are the motors across-the-line or controlled by a drive ?

 

[Ninja56]

Based on 430.52 and taking inrush into account my first thought would be a 200 amp panel.
Are the motors across-the-line or controlled by a drive

I have that as well. I have panel size as 200 amps, main breaker 200 amps, with 3 branch circuits. They’re across the line.

 

[Ninja56]

When determining the entire panel ampacity what section of the NEC do I reference?

 

[augie47]

430.24, 430.53

 

[Ninja56]

430.24, 430.53

Thank you.

 

[Ninja56]

This is what I’m working on.

 

[Ninja56]

I changed the answer of the panel ampacity to 125 amps.

 

[Tulsa Electrician]

I changed the answer of the panel ampacity to 125 amps.

You may want to show your math to support that. (Hint)
We can help.
Since it a school test. You will need to do the work.

 

[Tulsa Electrician]

I have a question to help you.
What do you do for sizing when you have multiple motors.

 

[Ninja56]

Size the largest motor by 1.25 or the sum of the FLC of all motors.

 

[Ninja56]

I did. Thank you.

 

[Tulsa Electrician]

What ansawer did you get?

 

[Tulsa Electrician]

Let's look at the sheet provided.
We must base our ansawers on this sheet.
Line 1: what size of panel( trade size)?
Line 2: what size main breaker?
What two options did it provide you?
Also please write down your answers and you do them.
Then provide an answer to the question on the sheet.

So I would like to see;
#1 your ansawer to the motors ampacity.
#2, your ansawer to question 1 of sheet.
#3 your ansawer to question 2 of sheet.

Have you ever took one of those test that said do nothing until you have read the entire sheet. Hint *