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I doubt that Noalox on copper wire will be of any concern. I do not use it on copper often but I have been known to fill wirenuts up and use it on copper connection in a ground junction box.
 

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I have a local utility that I have seen use axle grease in AL connections on AL wire.
They do go the extra mile and use grease rated for trailers submerged in water.
Their engineer told me as long as you keep the air off the connection your good to go.
They were using hydraulic tools for crimping the connections.
 
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