×
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

Can a disconnect switch be also used as an ON/OFF control for a fan?

thread242-400863

Can a disconnect switch be also used as an ON/OFF control for a fan?

Can a disconnect switch be also used as an ON/OFF control for a fan?

(OP)
Does NEC forbid using a disconnect switch for both protection and unit operation? Typically we would have a separate disconnect and ON/OFF switch but it has been suggested to combine these two. It doesn't sound right but I couldn't find in the NEC where it was explicitly forbidden. Any help on this would be appreciated.

RE: Can a disconnect switch be also used as an ON/OFF control for a fan?


Not an NEC issue. if its a large fan (over 1 hp or 3 phase) maybe wanna consider soft start or motor controller or contactor.

RE: Can a disconnect switch be also used as an ON/OFF control for a fan?

Switch must be fused and be horsepower rated.

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
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close