I am adding a 4 way switch to a 3 way sw system. I am going to put the the new 4 way switch where one of the existing 3 way switches is currently. I am running 3 conductor cable the the new location and then i am going to put the 3 way sw there. My question is i need to use all 3 wires as hot, how do i mark the white one ??
Either is fine. Don't forget to mark both ends of the white wire as well as both ends of any other white wire that this "re-marked" wire is attached to.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.