Westinghouse 11-300 Panel

[Ainsley Whyte]

Checking if a motor rated for 100HP at 111 amps ,3 phase 460VAC
connected from
11-300 Size 4, FVNR, 28" Bucket, with the following New Eaton Components:
1] HMCP150T4C Motor Circuit Protector
1] AN19NN0A5G140 Size 4 Starter with C440 SSOL Relay, 28a to 140a
1] C0300E5EFB 300vA CPT, 480:120, Fused.

in a Westinghouse 11-300 Panel with vertical bus rated for 600 A. be of any concern ?????
Should the bus bar able to handle without overheating?/

 

[Jraef]

Even 300A vertical bus would be fine.

Side note; That's an oldie but goodie. If you didn't know, that is the first "Motor Control Center" on the market, an adaptation of the Westinghouse WRI Switchboard which had "buckets" that would house individual circuit breakers, so they added motor controllers and called it the 11-300 Motor Control Center.

 

[Ainsley Whyte]

Even 300A vertical bus would be fine.

Side note; That's an oldie but goodie. If you didn't know, that is the first "Motor Control Center" on the market, an adaptation of the Westinghouse WRI Switchboard which had "buckets" that would house individual circuit breakers, so they added motor controllers and called it the 11-300 Motor Control Center.

Thanks my Friend, can you explain when the motor is starting up and pulling up to five times FLC say 5 x 111 = 555 A, Would the 300 A vertical bus bar over heat ????

 

[Jraef]

No. That's part of the equation when sizing bus bars in MCCs, it has to do with heat rise.

 

[Ainsley Whyte]

No. That's part of the equation when sizing bus bars in MCCs, it has to do with heat rise.

Really appreciate you help my friend.
However where could i find a specification for maximum current loads that those bus bars can manage ????

 

[Jraef]

Get in your deLorean, put some garbage into your Mr. Fusion, turn on your Flux Capacitor, take it up to 88MPH and set your time meter to 1955. Find Doc Brown and have him tear off the pages of a Westinghouse catalog (no copy machines yet back then) and take them to the local high school to put them on a mimeograph machine. Good luck....

In all seriousness, there are standards for heat rise in bus bars for switchboards and MCCs that you can access, but it usually means buying the standards. Try using your Google-fu powers to see if someone has reposted those standards or relevant sections of them, or given interpretations etc.