Hey guys I have a question that is confusing me. It is mentioned that the N.C -[/]- (normally closed) contact is similar to a Logical invertor (NOT). How is a --|NOT|-- similar to a --[/]-- contact ? Can someone please explain this with diagrams ? Thank you very much !! I am asking this because I want to know if this model is correct : Son = On Switch Soff= Off Switch Lon = ON light Loff= OFF light M= Motor The on switch should turn on the Motor and ON light. The off button should turn off the Motor and ON light, AND turn on the OFF light. http://img134.imageshack.us/img134/4277/imag0194.jpg [Broken] NOTE : This isnt homework, this is an inquiry.