Can someone provide a diagram for this? I am finishing my basement and will have multiple outlets where the bottom outlet will be switched from two locations. I understand how to do this with one switch (attached diagram) but not positive on how to do it with two switches. Just to give a little more info (not that the physical location really matters), but there will be the first switch, then multiple outlets, then the second switch, then a couple more outlets.
Best Answer
Jack has answered your question. Since /5 cable does not exist, you are forced to either use conduit as Jack proposes - and I gather that is not a wiring method familiar to you that you are comfortable with, more's the pity because it's a nice one. EMT or smurf tube between the points, pass the 2 yellow travelers straight on through, wire up the rest as usual.
Since you want to go cable, you need two /3 cables.
Like ships that pass in the night.
You already know how to wire it if a 3-way wasn't involved.
You will need to wire the other 3-way as if it was a spur off the first 3-way. So electrically, it will be an independent /3 branch, and will not share ANY wires with the receptacle /3 wires.
Physically, as you know, the two /3 cables will run nearly the same route. That is true. So I understand the temptation to "save one wire". However you cannot do that because it will introduce unequal currents in the two cables. Current will come out one traveler, and return on the switched-hot in a different cable, and that inequality of currents is not allowed.
What's more, it wouldn't save much wire, and, it would create a serious box-fill issue in the second switch as you'll have 3 cables converging there. (so a 27 cubic inch box!!) "The next guy" working on the switch won't understand what's going on. This way it stays straightforward and Code legal.
The /3 "spur" to the other 3-way contains 2 travelers (yellow) and always-hot (black). Each 3-way gets 2 travelers. The origin 3-way common goes to switched-hot (red). That way there is always-hot at the far 3-way in case you fit a neutral-less smart switch someday.