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


VFD cable and compression lugs

VFD cable and compression lugs

VFD cable and compression lugs

Is VFD cable requiring special compression lugs?

In our application we are using 500 MCM VFD cable, Lutze A2205003.


We intended to use compression lugs 500 MCM compression lugs, Punduit LCA500-1-6 with this cable:


However, when conductor is stripped from isolation fine strands fan out and won't fit inside of compression lug. Are there special compression lugs required for fine strand conductors? Maybe there are some tricks how to make it fit. Please, share your experience.


RE: VFD cable and compression lugs

3800 strands? I doubt that you will get that into a 500 MCM lug.
I fought with locomotive cables. Much less than 3800 strands but similar flaring.
I used a small Aero type hose clamp to contain the strands.
I left about 1/8 inch of the strands protruding to start into the lug.
Once the strands were started into the lug, the hose clamp was loosened slightly so that the lug could be tapped further onto the cable.
Then the hose clamp was removed and the lug tapped all the way onto the cable.
I was using set screw type lugs.
I needed to use an oversized lug.
If you have to use a 750 MCM lug you will have approvals issues compressing it with a 500 MCM die.
Ask Lutze for recommendations for lugs.
Go to set screw type lugs.

"Why not the best?"
Jimmy Carter

RE: VFD cable and compression lugs

Yes, there are special lugs AND DIES for what is referred to as “Class K stranding” of conductors. You cannot use standard compression lugs or dies. The cable mfr would have done you a favor to mention that in their specifications, I guess they don’t care....

" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

RE: VFD cable and compression lugs

Here is a nice discussion in general using mechanical lugs on flex wire,

Here is one source for properly rated compression lugs,

And from Panduit,

The proper lugs and info are out there, but there are still some gray areas, like for Class K wire, if it is listed as "Class K "flex" wire" instead of Class K MTW/welding wire/battery wire then technically it is only permitted by "specific additional testing". Take a quick look here,

When dealing with fine strand cable I start to strip off the insulation, move it away for the cable far enough to use a tie wrap around the strands, then as I remove the insulation I keep pushing the tie wrap up close to the end, insert the cable in the lug, then as the cable goes in I cut the tie wrap, goes fast and other than wasting a few tie wraps, has worked well for me over the years.

Hope that helps, MikeL.

RE: VFD cable and compression lugs

Thank you all for the info. Something to study.


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


eBook - Rethink Your PLM
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. Download Now
White Paper - Using Virtualization for IVI and AUTOSAR Consolidation on an ECU
Current approaches used to tackle the complexities of a vehicle’s electrical and electronics (E/E) architecture are both cost prohibitive and lacking in performance. Utilizing virtualization in automotive software architecture provides a better approach. This can be achieved by encapsulating different heterogeneous automotive platforms inside virtual machines running on the same hardware. Download Now
White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. 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