In the 1st. The colors will vary depending on whether nm cable or conduit was used.
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No neutral wire in switch box. In the 2nd diagram below blue wires are used for travelers. The neutral wire should be extended from the switch box following the electrical system and wiring ethics in order to safety add a neutral wire to the smart switches. With nm cable the wire colors for travelers will be black and red using 3 wire cable. If it is in mc cable then a neutral must be in the device switch box. Simple single pole toggle switch. In this video i rewire an electrical switch box that doesnt have a neutral wire present.
The circuits neutral wire is in the junction box holding the light fixture. Typical 3 way switch wiring nm cable. There is no standard for wire colors on 3 way switch travelers. For smart switches that function without a neutral wire a home hub is essential. No longer allowed after 2011 nec if no neutral wire in switch boxes 3 way switch wire colors. There generally isnt a neutral wire a light switch box itll be on the other side of the lamp.
The rewired configuration gains a neutral wire that enables you to use the new switch to. So you have the live enter then the live continues through the switch to the lamp and. An electrician should be called to extend a neutral wire from the existing switch box. 100 wire the caseta up like a 2 way and put the remote in the other box. Its a 2 wire switch no nuetral required for the switch itself they sell an additional bracket for the remote to put in any decora cover plate. If you want to use smart switches and dont have a neutral wire in your switch box you can hire an electrician to run a neutral wire between the light fixture and the switch.
My journeyman said if its in pipe no neutral is needed in the device switch box. Another option to add a neutral wire is to add a new cable to the switch. You can also have an electrician rewire the switch and light fixture which is potentially more expensive. With conduit the wire colors for travelers could be any color. The two wires that come down to the switch from the hot leg powering the light itself. Situation is a single circuit 120v.