Electrical separation of Power Districts

All:

I need some help.  Please take a look at the diagram below.


Items to take note of:

• Switch #34 is a Ross Custom Switches O31 LH turnout.
  
• Switch #34 is the divider between Power District 4 and Power District 7. Note track feeder pair #4.1 to its left and track feeder pair #7.12 to its right.
  

My questions:

1) If I remember correctly, all 3 legs of a Ross turnout are electrically isolated from each other. Is that correct?
2) Do I need a fiber (insulating) center pin at the location shown on the drawing?


Thanks,

George