I have aluminum wire in my house. Is this safe?

Many years ago, aluminum wire was used for general household wiring. Even today, larger gauge aluminum wire is used at service entrances. There have been some issues over time due to this wire occasionally being under sized and being spliced to copper wire which can be dangerous. Also, aluminum wire tends to expand and contract more than copper which can cause lugs and terminals to work loose. Just having aluminum wire in and of itself is not dangerous as long as it is periodically inspected and regularly maintained.