Before I begin this project, I just wanted to hear some confirmation that this will not become a hazard. I want to have several outlets that I can toggle on and off by using touchscreen input to control relays. Please see the attached schematic and let me know if you see anything I am doing wrong or that could become dangerous.
Additionally, is there a limit to the number of outlets I can connect in parallel like this? Is four or five reasonable?
I would use double-pole relays so that both HOT and NEUTRAL poles are switched. You can't be assured that the H and N connections at every outlet are correct unless you test every one beforehand. If H and L are swapped and you open N a hazard could form.
We have no clue as to you ability to wire up something like you have shown. Nor do we know the wire size or the insulation of the wire. You definitely need a 15 amp fuse or circuit breaker where it plugs into an outlet. You certainly do NOT want to use the little blue relays because they fail open or closed so often. Use relays that are US made for such use.
Paul