ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,589 Are you busy
166,400 Re: Forum
160,692 Need opinion
Who's Online Now
0 registered members (), 78 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#6643 - 01/08/02 10:25 PM Name that voltage.  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
A previous post got me wondering--

I know 480Y/277
480 Delta
240 Delta
208Y/120
240/120

Is there actually a 230 volt supply system?

I believe that 230 & 460 must be nominal designations that fall in between 220&240 and 440&480, respectively.


Work Gear for Electricians and the Trades

#6644 - 01/09/02 10:36 AM Re: Name that voltage.  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
According to NFPA and ANSI the nominal system voltages (line to line) in the US are:

600V
480V
240V
208V
120V

There are additional descriptions such as three or single phase, delta or wye, grounded or ungrounded, but in all cases these are the line to line voltages.

Utility voltages systems like 110, 115, 220, 230, 440 have been obsolete since 1949. There are some industrial plants that will use non-standard systems but these are usually very rare.

The confusion usually comes from utilization equipment, where manufacturers are allowed to rate devices at any voltage they want.

For example:
Fuse manufactures use maximum voltages of 125V, 250V, and 600V, and home appliances are usually at 125V.

Industrial motors are always rated at 115V, 200V, 230V, 460V, and 575V. But their instructions then list the nominal system voltage the equipment was designed to be used on (i.e. 230/460V motor on a 240V/480V system)


[This message has been edited by JBD (edited 01-09-2002).]



Member Spotlight
NickD
NickD
Amish Country, PA
Posts: 46
Joined: March 2013
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.012s Queries: 14 (0.003s) Memory: 0.7417 MB (Peak: 0.8598 MB) Zlib enabled. Server Time: 2017-03-27 22:20:30 UTC