I'm planning to install low voltage puck lights under my kitchen cabinets controlled by a switch. I have relatively easy access to incoming power. I'm going to run pigtails from the live line to the switches -one to the existing switch and then one to the new dimmer switch I'm installing. I need to have two sets of lights since the low voltage transformers are 60W max. and now need to get power to both transformers. One transformer will require only a couple of feet of line to reach while the other will require about 25 feet since it's easier for me to go down into the basement and back up the other wall than ripping up my entire kitchen backsplash area. Here's where the questions come in.
First, I need to hard wire the transfomers and plan to do so in junction boxes with covers inside my kitchen cabinets. Is that within code? If not how does everyone do it since it seems to be a popular addition?
Second, can I just hard wire the 120v side of the transformers like mulitple outlets or lights (ie dimmer to first transformer and then hard wire in a run of line out from that transformer to the other one?) Or even simpler - can I run two lines out of the transformer - one going to each respective transformer?
Third, I know I need to buy a dimmer designed for low voltage supplies and capable of handling 120W but does the distance of the run from the switch to the transfomer have to be factored in? Any limitations?

Thanks in advance

You can run the 120 volts from your dimmer, ot the primary of the 2 Xfmr's. The secondary
out to the 2 sets of lights.
Many dimmers handle at least 300 watts.
120 watts is a 1 amp draw at 120 volts. (Volts X Amps = Watts)
The distance is not a factor on the primary side. At 12 volts, you can see the lighting difference(Voltage can drop noticibly different over distance) Larger wires can reduce the voltage drop on 12 volts.

Thanks Stratmando. My max distance from the transformers on the low volt side will be about 4 feet so I'm hopeful there won't be much drop off there.

4' is fine. I have wired Large Swimming pool enclosures, and have had to use #6 as the Main Buss, With smaller wires you could see each light would be visibly dimmer.
That is why voltage is raised so high to distribute over great distances.