ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
600 KW 120/208 3 Phase Y protection
by gfretwell. 07/20/17 01:02 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,172 Are you busy
174,562 Re: Forum
166,994 Need opinion
Who's Online Now
0 registered members (), 34 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#137135 - 05/30/03 12:27 PM Old European phase designations  
Texas_Ranger  Offline
Joined: Dec 2001
Posts: 2,399
Vienna, Austria
I found an explanation for the RST phase designations once commonly used in Europe. Older motors had XYZ (connected to the windings), UVW (connected to the incoming lines) and generator and outlets had RST.

Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

#137136 - 05/30/03 06:35 PM Re: Old European phase designations  
Trumpy  Offline

Joined: Jul 2002
Posts: 8,217
SI,New Zealand
Hi Ranger,
I've always wondered about them designations.
And also why RST was used, as opposed to say ABC.
The first time I ever picked up a European Electrical book, it took me a wee while to work out what they mean't.
Our motors use A1,B1,C1 and A2,B2,C2, I think that this is based on the British system, but I could be wrong, too!.

Let's face it, these days if you're not young, you're old - Red Green grin

#137137 - 05/30/03 11:55 PM Re: Old European phase designations  
frenchelectrican  Offline
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
i will add here for north american phase destation are L1,L2 L3 or A ,B, C but for motors useally labled as T1, T2 ,T3 but we do see few older phase labels too like you say RST and WXY etc .. oh oh yeah motors also add on as T11,T12,T13 etc etc... and the transformer genally label as H1 ,H2,H3 ( hi volts ) X1,X2,X3 and the nuetural gernrally is X0 or H0 one of the two ..other wise i will try to find some more north amercian verison destation and french phase genrally are RST also or UVW one of two but i belive they do change it also but will check with my freind what he have to say with it

merci marc

Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

#137138 - 05/31/03 06:21 AM Re: Old European phase designations  
pauluk  Offline
Joined: Aug 2001
Posts: 7,520
Norfolk, England
The RST coding is something I wondered about ever since I first saw those designations on some European test equipment when I was a kid (thinking back on it, I reckon it must have been a phase rotation tester).

It's certainly strange to those of us who are used to seeing A,B,C, or L1,L2,L3. Still, I suppose the R,Y,B (red, yellow, blue -- phase colors) seen sometimes in British circles would seem strange to outsiders.

#137139 - 06/02/03 12:24 PM Re: Old European phase designations  
djk  Offline
Joined: Dec 2002
Posts: 1,237
They could mean something in German perhaps?

#137140 - 06/02/03 03:03 PM Re: Old European phase designations  
Texas_Ranger  Offline
Joined: Dec 2001
Posts: 2,399
Vienna, Austria
No. it's just the alphabet backwards, from the motor winding terminals to the generator terminals.

#137141 - 06/02/03 03:50 PM Re: Old European phase designations  
C-H  Offline
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
I suppose the alphabeth forwards would have been too logical even to the Germans...

Member Spotlight
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 

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 (0.002s) Memory: 0.7841 MB (Peak: 0.9372 MB) Zlib enabled. Server Time: 2017-07-21 04:49:45 UTC