In order to have consistent spacing between all of your conduits, your conduits must be spaced minimum 5/8". You will notice once you go down from distribution conduit sizes (4"-2") to branch sizes (1-1/2"-1/2"), the thickness of the lock ring changes. Without a minimum of 5/8" spacing, the lock rings will not install properly and you will not be able to achieve a proper bond..........conduit bond.