Conductive loctite #3888 on conduit box attachments?

[USAeng]

There is a small steel conduit box with one steel adapter screwed in and then one aluminum adapter screwed into that with a 3 pin connector... 2 pins are ground and one is hot... the 2 ground wires go up and are soldered in the conduit box and the hot goes up through the box and out to a rod... later the current travels back through the rod to return to the 2 ground wires at the box...

The drawing saws to use the conductive loctite #3888 between the steel adapter and aluminum adapter.... any idea why this would be called out?

I had our shop guys wire brush the coating off the aluminum threads and then put a drop of 242 threadlocker on the threads.... I know 242 isnt anything close to this purpose, but I wanted to make sure there was nothing very important about the #3888 threadlocker

Thanks a lot.

 

[itsmoked]

Yes, there is a difference. 3888 is electrically conductive. Aluminum and steel are unfriendly bedfellows which the 3888 will assist with also.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[zappedagain]

Galvanic corrosion occurs when current flows through aluminum and steel (and other dissimilar metals too).

http://www.engineersedge.com/galvanic_capatability.htm

John D

 

[USAeng]

exellent link... thanks a lot for that info

however- I see that aluminum no matter what grade is close enough to the index of carbon steel to be ok... so maybe the person who made this drawing didnt know, so put it on there to be safe...

 

[zappedagain]

While I'm not a chemist, I believe that 0.1 isn't really close... and can still have a reaction.

John D