you put the blocks on the din rail that came with the kit.
http://www.usfirst.org/uploadedFiles...on_Diagram.pdf
thats a diagram of the electrical components and how to wire its shows how the blocks go. they all just snap on to the din rail. and you tighten with the screws in the middle.
<R47> All main and branch circuits shall be wired with appropriately sized wire:
-- 12 AWG or larger diameter wire must be used for all circuits protected by a 40A circuit
breaker.
-- 14 AWG or larger diameter wire must be used for all circuits protected by a 30A circuit
breaker.
-- 18 AWG or larger diameter wire must be used for all circuits protected by a 20A circuit
breaker.
-- 24 AWG or larger diameter wire must be used for providing power to pneumatic valves.