×
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

A couple of question relating to UL 508A and Class 2 systems.

A couple of question relating to UL 508A and Class 2 systems.

A couple of question relating to UL 508A and Class 2 systems.

(OP)
Assuming a requirement to have all equipment UL labeled -

If a company produces a 24v dc control box that controls a 12v dc motor 100' away and feeds the box with a UL Class 2 power supply –

1)    Can they claim that the control box is exempt from any UL508A inspection and therefore should not have a UL label
OR
2)    Should they have the control box designed, built and inspected under 508A and ultimately have a UL label?

Thanks
 

RE: A couple of question relating to UL 508A and Class 2 systems.

Dave,

My opinion (and I manage engineering for a 508A panel shop) is that your gizmo does not require UL investigation as an industrial control panel.

That said, it becomes a marketing and local-code authority issue.

Depending on who winds up inspecting the installation, since your product CAN be labeled, they may insist on a label (for various reasons).  We do these often as custom panels.  If you're going to mass-produce this controller, it would be better to get it labeled under its own file number, rather than under 508a.

Marketing-wise, it is sometimes tough to convince the non-UL-savvy public that a label isn't needed...

Them's my two cents.  Not really cut and dried.

Goober Dave

 

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