DLO Locomotive Cable in the NEC

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rbarnett's picture
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Joined: 2014-03-04

It is not uncommon to hear of DLO Locomotive cable being used in applications where flexibility is needed. DLO cable is pretty finely stranded and works well. However, DLO is not in NEC Article 400 on Cables or in Sec. 310.104 Conductor Applications and Insulations. Or is it and I'm missing something? How do you size and then apply this cable in the field?

skd76's picture
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Joined: 2013-09-11

Locomotive (DLO) cables aren't addressed by the NEC. Fine wire termination apparatus is newly addressed by UL and is now somewhat available. I have utilized and I've approved DLO in big motor applications. Often when a motor terminal compartment is way smaller than the bending radius needed for standard conductors. The DLO manufacturer will provide ampacity tables and the AHJ may approve - when/if it is a sensible application.

rbarnett's picture
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Joined: 2014-03-04

Makes sense. I found some DLO cable that manufacturer says has RHH insulation and thought maybe I could take that to the tables since RHH is there. But Article 400 makes it pretty clear if it's a cable and not in the Code then it's up to the AHJ. Obviously, the manufacturer's info makes the best resource.

dpiper's picture
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Joined: 2014-05-28

If using manufacturer's ampacity tables be sure that their ampacities are based on your installation methods (i.e., NEC Art. 392, IEEE 45, API 14, etc.). Also, confirm what the temperature rating ampacities are based on. If temperatures are higher than what your terminations are rated for then you must derate the cable to the correct temperature.

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