ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Thought this was funny
by Ronny - 12/03/20 06:08 PM
From an outsider- How does tipping work?
by gfretwell - 12/02/20 02:38 PM
Happy Thanksgiving
by Trumpy - 12/02/20 04:11 AM
Where is Everyone?
by Trumpy - 12/02/20 03:51 AM
What does your work place look like?
by Trumpy - 12/02/20 03:42 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 20 guests, and 13 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Single Phase 220V from 3 phase Y 208 #162912 04/27/07 04:13 PM
Joined: Apr 2007
Posts: 1
G
GCI Offline OP
New Member
I have 3 phase Y 208 at my office. Purchased a lift that has a pump motor on it that requires 220 sigle phase. Any two legs of three phase are 120 degrees out of phase, I have seen wiring for welders wired this way, but a - motor probably requires 180 degrees phase difference? Step up transformer or other solution?

Work Gear for Electricians and the Trades
Re: Single Phase 220V from 3 phase Y 208 [Re: GCI] #162921 04/27/07 05:51 PM
Joined: Feb 2003
Posts: 231
R
RobbieD Offline
Member
Just hook it up to 208V. It will work fine.

What type of engineer are you?

Re: Single Phase 220V from 3 phase Y 208 [Re: GCI] #162937 04/27/07 07:13 PM
Joined: Jul 2001
Posts: 599
J
JBD Offline
Member
Originally Posted by GCI
I have 3 phase Y 208 at my office. Purchased a lift that has a pump motor on it that requires 220 sigle phase. Any two legs of three phase are 120 degrees out of phase, I have seen wiring for welders wired this way, but a - motor probably requires 180 degrees phase difference? Step up transformer or other solution?


2-wire motors are wired line-line. There is no phase difference between only two wires. The concern is that you actually have enough voltage to run your motor, the worst case is you will need to use a buck-boost transformer. Is your motor really 220V and not 230V?

Re: Single Phase 220V from 3 phase Y 208 [Re: JBD] #163009 04/28/07 10:01 PM
Joined: Jan 2005
Posts: 155
D
Dave T Offline
Member
Have you asked the manufacturer or the pump motor manufacturer??
This is not to be taken for an answer to you application but some background for the answer you should get from the manufacture.
If in fact it is a 220v motor od it NEMA rated? If so antivipate that it is able to operate satisfactory a +-10% of that which would be 220 x.90=198v. I did not say that the device was capable to operate at down to 198v but there's a good chance that it would be an accurate answer.
Remember one thing. If a motor is rated at 10HP at 220v it will draw a specific amount of amps to product 10HP. In doing so there will be losses in heat. Now reduce that voltage to 198v. To produce the same 10HP the motor would have to draw more amps to produce that same 10HP. More amps = more heating.
It is common that whem a motor is applied it never is required to produce its nameplate HP anyway.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
watersparkfalls
watersparkfalls
Washington...Not DC
Posts: 236
Joined: March 2005
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 20
Popular Topics(Views)
272,226 Are you busy
206,114 Re: Forum
194,103 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3