I will be replacing main electric circuit breaker soon. Notice copper and aluminium contacts (this is the upper part of it, that goes to a meter) :
When I told this to my neighbor, he told me to check if I have to use antioxidant grease. Something like this (see the link). Can somebody please bring some light if this is required? My neighbor said he had to use it once for some AC electric work. That contact seems have both copper and aluminium contacts - why they would use different metals on the same contact?
Another photo on the same breaker (from a different angle) - Neutral on main service breaker? .
I do have a torque measuring tool as it has to be bolted with a particular force there. Is there is something else I should be aware of regarding this work?