×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

fan wiring a violation?

fan wiring a violation?

fan wiring a violation?

(OP)
A fan comes with installation instructions showing it installed with two switches. One switch is a master power switch, the other allows the user to select between the maximum speed and a lower speed that can be set on the fan itself. The installer installs the master switch and connects the remaining two wires together so the fan is either on full speed or fully off. By disregarding the instructions, has the installer violated listing and therefore violated NEC? Thanks.

RE: fan wiring a violation?

Unless the installation instructions show or describe an option for installing without the speed switch, I can see it being an issue with some inspectors.  

Perhaps some correspondence with the manufacturer/supplier might help.

   

David Castor
www.cvoes.com

RE: fan wiring a violation?

Stevenal, it sounds like (but isn't clear to me) the two switches are external to the fan?

If so (external switches), you're not violating the listing -- a wire nut can serve as a permanently-closed switch.  UL listing doesn't extend past the end of the lead wires. The fan is "as tested" at UL unless you open it and change something. (I have done this exact thing before, as engineer of record in a bunch of schools -- I actually drew the wirenut on the plans.  No problem with electrical AHJ in Memphis). Of course, you should check with your own AHJ for a final ruling if you're in a quandary.

If not (switches mounted in the fan housing and wired at the factory), you're violating the UL to open it and jump out the switch.

Good on ya,

Goober Dave

RE: fan wiring a violation?

Oops I forgot my disclaimer, "In my humble opinion, based on my personal experience, ..."

But you two posters above me are old-timers, so I'll not worry.

Good on ya,

Goober Dave

RE: fan wiring a violation?

(OP)
The switches are external.

I must disagree that the listing does not extend past the wires. Certainly it would violate the listing to hook it to the wrong voltage or operate it it the wrong atmosphere.

No wish to involve an inspector at this stage, just collecting ammo to attempt to get the installer to do it right.

RE: fan wiring a violation?

If you want the switch, I think you can make a pretty good case that the installer did not follow the manuf. installation instructions, so UL listing is void and the installation is a violation of NEC.  I don't think it is a safety hazard as installed, but that's a different question.  

 

David Castor
www.cvoes.com

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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