ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by gfretwell. 09/24/17 12:05 PM
75 kva tranformer
by sparkync. 09/23/17 06:41 PM
Another generator question
by gfretwell. 09/23/17 04:15 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,954 Are you busy
176,749 Re: Forum
168,598 Need opinion
Who's Online Now
0 registered members (), 42 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#218402 - 04/16/17 03:05 AM 201 volt equipment?  
bigpapa  Offline
Joined: Mar 2006
Posts: 81
I was looking at this commercial dishwasher name plate voltage, 201V. It's ULc ETL approved equipment that is connected to a 208V system. Has been working fine for years. It's rated for 65A 3Ph.

Usually kitchen voltages are around 200-204 volts under full load anyway but I have no idea how it's legal without a standard voltage on the nameplate.

Work Gear for Electricians and the Trades

#218403 - 04/16/17 08:54 AM Re: 201 volt equipment? [Re: bigpapa]  
SteveFehr  Offline
Joined: Mar 2005
Posts: 1,209
Chesapeake, VA
A lot of motors are rated at 460V for the same reason. Makes a lot of sense, actually.

#218404 - 04/17/17 02:22 AM Re: 201 volt equipment? [Re: bigpapa]  
bigpapa  Offline
Joined: Mar 2006
Posts: 81
I believe the 460V rating is because the earlier delta services were usually 230V so we could have a dual voltage configuration by either changing the motor winding connections or the taps on the pole top transformers series/parallel for delta 460 or 230.

With a grounded 480/277 they work fine. Ive never seen a 480V motor before, always 230/460.

I haven't seen a 460V delta service either for that matter. Most likely because the power company would rather keep 240/480 transformers in stock because delta 230V 3PH is not offered here anymore. The 240's are used everywhere for single phase setups.

#218407 - 04/17/17 05:45 AM Re: 201 volt equipment? [Re: bigpapa]  
SteveFehr  Offline
Joined: Mar 2005
Posts: 1,209
Chesapeake, VA
No, it's for voltage drop. NEMA standards (nameplate ratings) assume voltage drop and are often different than nominal line voltage.

230Y/400V 50Hz is the European standard and why you see a lot of 208-240V 50/60Hz stuff, but 460V is nobody's standard. 460V = 480V - about 5% voltage drop. I haven't really seen much 201V stuff, but it strikes me as a similar NEMA rating which is OK within a wide swing of voltages.

Last edited by SteveFehr; 04/17/17 05:51 AM.

#218410 - 04/17/17 09:05 AM Re: 201 volt equipment? [Re: bigpapa]  
NORCAL  Offline
Joined: Sep 2002
Posts: 873
200V is common, never heard of 201V, my shop has two Rockwell machines, 7" grinder & HD shaper w/ 200V 3Ø motors from the early/mid 1970's, they were both former school machines where 208V is prevalent.

#218443 - 04/28/17 10:49 PM Re: 201 volt equipment? [Re: bigpapa]  
jraef  Offline
Joined: Jul 2004
Posts: 101
San francisco, CA, USA
Every voltage has two official levels; a "distribution voltage" and a "utilization voltage". The distribution voltage is what the utility supplies at your service drop, i.e. 480, 240, 120 etc. The utilization voltage is the voltage level to which the end use equipment is manufactured, which is purposefully lower to allow for expected voltage drop from the utility connection point to the end device due to wire length. So for 480V distribution, motors are made for 460V utilization, 240V becomes 230V, 120V becomes 115V and 208V becomes 200V. Nobody uses 201V, it's most likely a typo, rounding error or it's something from a place like China where the mfr has no clue what they are doing because they don't engineer anything, they just copy something else and they wrote down the numbers wrong when they copied it.


#218445 - 04/29/17 12:15 AM Re: 201 volt equipment? [Re: bigpapa]  
bigpapa  Offline
Joined: Mar 2006
Posts: 81
It's manufactured in Garden Grove California.

#218451 - 05/03/17 10:29 AM Re: 201 volt equipment? [Re: bigpapa]  
Texas_Ranger  Offline
Joined: Dec 2001
Posts: 2,402
Vienna, Austria
This differentiation between distribution and utilisation voltage is something that seems to be a US concept. In Europe distribution voltage and nameplate rating are identical and distribution voltage is given with a specific tolerance, e.g. 230/400 V +/-10%. On top of that you have 4.5% acceptable voltage drop between the service fuses and last point of fixed wiring, no more than 1.5% between service fuses and meter and 3% in the building wiring.

Manuals for end users then state "Only connect to the mains if the nameplate rating matches the info on your electricity meter!".

#218625 - 07/13/17 09:50 PM Re: 201 volt equipment? [Re: bigpapa]  
Lostazhell  Offline
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
Originally Posted by bigpapa
It's manufactured in Garden Grove California.

Having lived literally a block from Garden Grove before, they have a HUGE Asian population, and 200V 3 phase being very common in Japan, Korea, etc that motor may have been made for export.

#218626 - 07/14/17 09:30 AM Re: 201 volt equipment? [Re: bigpapa]  
ghost307  Offline
Joined: May 2005
Posts: 911
Chicago Illinois USA
I had a job where we had VFDs right next to the 480V Service equipment so there was effectively no voltage drop.
The manufacturer had to make custom drives for us because the normal 460V rating wouldn't tolerate the actual line voltage.
Actually it had no problem with the voltage when it was 480...but when we started going above that (the Utility is allowed + or - 10%) the VFD started blowing boards.

I can't remember how many times they sent their standard 460V components before they realized that we actually knew what we were talking about when we specifically ordered 480V instead of their usual 460V stuff.

And no...we didn't pay them when they repeatedly sent us the wrong stuff and it blew up. GE now officially hates us.


Member Spotlight
dallas, texas, USA
Posts: 67
Joined: January 2002
Show All Member Profiles 

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.023s Queries: 15 (0.004s) Memory: 0.8110 MB (Peak: 0.9939 MB) Zlib enabled. Server Time: 2017-09-26 09:15:31 UTC