DLO wire terminations

[wb9vxy]

We like using DLO wire for large conductors in tight spaces.

What are the requirements for using finely stranded conductors?

Tnx,

T3

 

[Jraef]

Read 110.14 in the NEC, second paragraph. Whatever type of termination you use must SPECIFICALLY state that it is rated for the stranding class of the wire. DLO is generally Class K stranding. Most common mechanical lugs are NOT rated for Class K stranding. If you go with compression lugs, you have to get the ones specifically designed for the oddball kCMIL sizes that DLO comes in, i.e. 313.3kCMIL etc., and you usually have to use a specific crimp die that imprints onto the crimp that it was done with the correct die.

There are hand crimp lugs sold for DLO, and some people use a copper foil around the strands, then use standard mechanical lugs. But I'm not sure if those are approved methods that would meet the requirements of 110.14.

 

[wb9vxy]

So if I use a ferrule that is • UL E333905 on the wire and then put it in pressure lug or breaker am I following the rules?

 

[texie]

Also note that DLO cable is not NEC recognized. Make sure it also has a RHH or RHH-2 rating to comply with NEC.

 

[dkidd]

See

https://legacy-uploads.ul.com/wp-content/uploads/sites/40/2015/02/Electrical-Connections-Issue-3-2011.pdf

Tools and Tips for Assessing Compliance with Fine
Stranded Cable Termination Requirements

 

[petersonra]

IHI makes a whole line of mechanical lugs that are rated for fine stranded wire. I don't recall off-hand if class k stranded wire is included but you can go look it up at lugsdirect.com.

As a side benefit, many of them are also listed for allowing you to drill out the stud hole to whatever size you want within the limits of the listing.

 

[paulengr]

Most internal wiring in motors is fine strand. I rarely see any that are not. So unless it’s IEC terminals fine strand lugs are all I deal with. Mostly they just require going up one size. DLO is the only oddball. It’s an old DC motor thing, especially the GE camp. Today you can get lots of other wire types with the same very tight bending radius, jacket, etc. Only thing you won’t find is tinned strands.

 

[petersonra]

So if I use a ferrule that is • UL E333905 on the wire and then put it in pressure lug or breaker am I following the rules?

Some of the IHI lugs are listed to be used this way and do not require the ferrule be crimped to the wire first. The lug can be used to crimp the wire to the ferrule.