DLO (Diesel Locomotive Cable) and the NEC
- Thread starter kpezzoni
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jrannis
Senior Member
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- Fort Lauderdale/ Miami
Just be careful not to get one of the strands caught between the threads. It will destroy the lug threads when it gets in there
The question still remain is the lug oisted to be used with the rated wire or termination methid being used?
"Just be careful not to get one of the strands caught between the threads. It will destroy the lug threads when it gets in there"
jrannis, Is this in issue withg class B or C sranding?
"One can use ferrules to 'bunch' the fine strands of a DLO cable after which it becomes perfectly suitable to terminate it on any terminals that are designed for solid conductors. The spec usually calls for "solid or Class B, C stranded conductors"."
weressl, Is this methode UL listed method for use with the terminal? Does it pass the heat rise and pull tests as required by UL486?
The lug manufacturer would be able to advise you of that.
"Just be careful not to get one of the strands caught between the threads. It will destroy the lug threads when it gets in there"
jrannis, Is this in issue withg class B or C sranding?
"One can use ferrules to 'bunch' the fine strands of a DLO cable after which it becomes perfectly suitable to terminate it on any terminals that are designed for solid conductors. The spec usually calls for "solid or Class B, C stranded conductors"."
weressl, Is this methode UL listed method for use with the terminal? Does it pass the heat rise and pull tests as required by UL486?
The lug manufacturer would be able to advise you of that.
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
kpezzoni said:
Have you communicated with the AHJ so you are aware of what his/her issues are?
From what I have read on this thread, I would be concerned with the stranding/Class 'B' or 'C' issues. As has been pointed out, that is not an insurmountable issue.
Pierre C Belarge said:
Nothing yet. I forwarded a bunch of UL (test file #) and manufacturer data, so I think it is resolved (knock on wood). Hopefully I hear in the next couple of days.
One thing I did do was look up the temp rating of the compression connectors and found out they are 90degC copper rated, and made a comment that since the cables where landed onto bus bars and not any equipment listed in 110.14 that limited the cables to 75degC is was possible to even utilize the higher ampacity rating. Hopefully I didn't step into a big pile with that statement. :smile:
weressl
Esteemed Member
kpezzoni said:
This is where it gets tricky. If it is a switchgear assembly, the bus is sized to 50C* rise. In another word the current density per sq.in. crossectional area is sized to limit the temperature. Even though the heat does not come from the current caried by the bus itself but all associated components, splice, supports are designed to the 50C* rise. The cable connection maybe perfectly OK to rise to 75C* or 90C*, but if the conductive heat - which usually disipates within a few inches of the connection - MAY raise the temperature of adjacent components above their design limit. Switchgear manufacturers routinely supply bolted lug connectors on their connection point that are 75C* rated, or even 90C* compression connectors, but I never got an answer how the discrepancy netween the bus rating and the connectors' rating is resoved. They just do it. I wonder if this issue ever came up during UL testing.
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