ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Ground Rods: Installation and Hook-Up
by renosteinke - 11/26/22 07:28 PM
Happy Thanksgiving all!
by Bill Addiss - 11/24/22 08:37 AM
Colt Firearms Switchbox
by sabrown - 11/22/22 01:33 PM
Perfect work light?
by gfretwell - 11/22/22 12:48 AM
copper prices where you live and inflation
by gfretwell - 11/21/22 01:52 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 18 guests, and 47 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#44751 11/10/04 07:38 PM
Joined: Feb 2003
Posts: 231
R
RobbieD Offline OP
Member
Does anybody have a wye-wye connection diagram for a step up transformer. The transformer is fed 208V and the secondary feds a panel at 480V. It would be great if the diagram also shows the grounding and bonding connections.
Thanks in advance!

#44752 11/10/04 08:15 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
 
If 480Y/277V service is needed, the most common transformer configuration will have a 208V-delta winding, served by a 208V 3ø 3-wire source — a neutral conductor is not used.

See “Group A” units at www.acmepowerdist.com/pdf/Page%2014.pdf

See connection 46 at www.acmepowerdist.com/pdf/Page%2055-63.pdf

Grounding of the HO terminal is the same as for other separately-derived systems, such as the more common 480-delta—208Y/120V unit.

Low-voltage wye—wye transformers can have problems with triplen-harmonic currents, so are not too common and should be carefully applied.




[This message has been edited by Bjarney (edited 11-10-2004).]

#44753 11/10/04 09:30 PM
Joined: Feb 2003
Posts: 231
R
RobbieD Offline OP
Member
Thanks for the info! Does anyone have a drawing for a wyw-wye transformer?As per my post.

#44754 11/10/04 10:15 PM
Joined: Aug 2003
Posts: 1,374
R
Moderator
I found this thread in the "technical reference" area of this forum. If this isn't what you're looking for, you might search there.

https://www.electrical-contractor.net/ubb/Forum15/HTML/000065.html


Ryan Jackson,
Salt Lake City

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
JoeKP
JoeKP
Berkley, MA
Posts: 144
Joined: March 2008
Top Posters(30 Days)
NORCAL 3
Trumpy 3
Popular Topics(Views)
300,203 Are you busy
229,934 Re: Forum
214,773 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5