1-Ph connections from 3-Ph main service

Status
Not open for further replies.
Location
USA
Occupation
Engineer
In the attached image, the cross bus is rated for 600A with 3-Ph 4 Wire(A, B, C and N).
The vertical bus appears to be rated for 225A with 1-Ph 3 Wire.

Q1 - Is this a common setup? If the distribution is all 1-Phase, why is it being supplied with 3-Phase service?
Q2 - What would this panel be called as? A 1-Ph 3 Wire panel or 3-Ph 4 Wire panel?

Thank you.
 

Attachments

  • streemshot-2.png
    streemshot-2.png
    1.4 MB · Views: 25
they are probably using 240/120 single phase panelboards because they are cheaper. pretty common. work pretty good if you need a lot of 120 V single phase circuits.
 
The utility often supplies 208Y/120 for installations like that, and you just used standard 120/240 volt panels for the occupancies. The only things you have to remember is 240 volt heating appliances will be outputting only 75% of their wattage, and the neutral is always current carrying for the purposes of ampacity adjustment.
 
The utility often supplies 208Y/120 for installations like that, and you just used standard 120/240 volt panels for the occupancies. The only things you have to remember is 240 volt heating appliances will be outputting only 75% of their wattage, and the neutral is always current carrying for the purposes of ampacity adjustment.
Heating appliances will output only 75% of their wattage because of operating on 208V instead of 240V?
 
Status
Not open for further replies.
Top