Dual Rated Lugs/Connectors

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dicklaxt

Senior Member
I can count the number of times I have been involved with Aluminum Conductors on 2 fingers in the last 46 years and it was not a big deal just make sure that lugs/connectors were rated for aluminum.

I have however been reading posts on this forum today where dual rated lugs/connectors was mentioned when splicing Cu to Alum.I thought I would check some catalog data if I could find some on the internet and educate myself on this subject.............I find a lot of part numbers(with a different suffix) that are for either one or the other.This would be the exact same lug but would have to be specified what specific cable metal it would be used with while others can be used for either.

I don't find one that is listed to be used with both copper and aluminum at the same time.............I would think this is correct as if they were used together and touching then a galvanic action would occur thus corroding one (alum I think) over a period of time.

I suppose there is a lug/terminator out there somewhere that isolates one metal from the other and still works as an acceptable connector for the task of mixing specific metals.

Comments and clarification needed for this old dogs learning.

dick
 
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iwire

Moderator
Staff member
Location
Massachusetts
Basically if the two conductors touch each other the conductors have to be the same material.

If there is separation they may be dual listed.

See the split bolt in the middle, it has a separator and can be used to join copper to AL, the other ones are for copper only.

Copper%20Split%20Bolt.jpg
 

augie47

Moderator
Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
110.14 would be the applicable Code section. It notes that conductors of dissimilar metals can not be intermixed, so any single lug would have to have a "divider" similar to the one on a Cu to AL split bolt.
I know of none that have such.
(Bob coverd it better as my slow fingers typed)
 

dicklaxt

Senior Member
Thats kinda what I thought,thanks for confirming.

I just took a look at the last sentence in the opening paragraph of 110.14 and it might just be alluding to those items as acceptable to intermix metals,,,,,,,,,,,,I.m pretty sure solder or an exothermic weld would inhibit electroylis.Whatcha think about them apples?

dick
 
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dicklaxt

Senior Member
Don't know ,,,,,,,,I think you may need a mechanical fastener first then weld all around,just guessing now:grin:



dick
 
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