im in a local college taking motor controls an i think i understand how to wire a control circuit but not sure. on my diagram (we are wiring for industrial machines) i bring 120VAC into my stop btn (n/c) and back out to my start btn (n/o) an up to my contactor.then on my contactor (cr1-1) i come back to my start btn . can i bring both of my contacts to one end of start btn or do i need to go to both ends?

 

Draw out the circuit schematic and it should be clear. If not, post it up and we'll see.