×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

120V vs 208V motor

120V vs 208V motor

120V vs 208V motor

(OP)
Given a specific horsepower, does the selected voltage for a motor affect anything other than the current that the motor will draw?  I have a contractor that is proposing to install a 120V 3/4hp motor as opposed to a 208V 3/4hp motor and, other than current draw changing, I'm wondering if I should consider anything else in accepting the change.

RE: 120V vs 208V motor

Is the 208V motor also single phase?

RE: 120V vs 208V motor

(OP)
yes, both motors are single phase.

RE: 120V vs 208V motor

Then the current difference is probably the biggest difference.

RE: 120V vs 208V motor

(OP)
thank you for the quick response!

RE: 120V vs 208V motor

There are generally less voltage dip issues with a higher voltage motor. But it depends. In some instances voltage dip may be a real issue with the lower voltage motor. In other instances, there may not be much voltage dip or it may be there but not be an issue. It depends on the actual installation conditions.
I have seen 3/4 HP motors work well on 120 Volts with no problems and I have seen other installations where a 3/4 HP motor had issues on 120 Volts.
 

Bill
--------------------
"Why not the best?"
Jimmy Carter

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources