How to wire Two dimmers controlling a string of recessed light?

You can only have one dimmer per group. You can put the dimmer at either location, but not both locations.

There are "companion" dimmers available from some companies, that allow you to place additional dimmers in the circuit. But you'll have to use compatible equipment, which may or may not be available at your local big box store.

As @Tester101 says, with conventional dimmers, you can only have one dimmer in a circuit if the fixture (or set of fixtures) is being controlled from more than one location.

If you are switching from two locations, you also need to use 3-way switches for both the plain switches and dimmers (many dimmers are 3-way compatible).

There are specialized dimmers that work as master and slave units. These do allow dimming from multiple locations, but you need to use a set of matched units. These are also much more costly than basic 3-way dimmers.

Finally, if you are running remote switches that only connect back to the first set of switches, you need x/4 cable, not x/3. Two wires serve as travelers, one as the common return and one as neutral. While not every switch requires a neutral, code now requires it as a hedge against future active devices. If you do not need the neutral, simply cap it in the box.

you have 3 options:

1. smart switches. these are fancy master/slave pairs that communicate digitally. the downsides being that they are always drawing some power, they're pricey and they don't have a physical dial showing the dimmer setting.

2. 3-way dimmers. these look like normal dimmers, but when one side is turned on, it disables the other side. the downside being that if the dimmer is set low on one side, you can't turn it on or off from the other side.

3. 2 switches and 2 dimmers. if you install a spdt switch and a dimmer on one end, plus a dpdt switch and dimmer on the other end, then you can use the switches to determine which dimmer is "hot". the downsides to this plan include more wiring (which could get expensive). also, it would mean having separate switches and dimmers on each end, which takes up more space and might not look as nice or be as intuitive.

note: wiring option 3 could work as follows: provide power to the spdt switch, then connect both downstream terminals to the dpdt switch. send a wire from each downstream terminal on the dpdt switch to a dimmer such that the dimmers are never connected to both poles at once, then wire both dimmers to the light (group), and connect the light to the return wire.

Feit dimmers allow two dimmers on a circuit. However, you must also connect the neutral to the switch in addition to the line, load and traveler legs.