Quoted from jwwhite15:

Well I believe your thinking may be a little off, when you hit the flippers the Pinball machine is not distributing 120v its using the voltage allowed by the power supply/cpu/etc. I would believe you have more of a contact or grounding problem and not a supply voltage problem. When it comes to voltage it is what it is. A 20 amp or 15 amp breaker is not going to change the voltage. Having "stuff" plugged in does not change that either. Your draw in amps is what's going to cause degradation with your supply. I think 3 20 amp circuits is over kill but if you are going to do that remember its also about the wire size. I recommending not putting 14 gauge wire in that 20 circuit. Use at least 12 gauge to strengthen your circuit. Hope that makes some sense and helps a little.

Quoted from vid1900:

Your electrician will probably put 5 duplex outlets on each 20A breaker.
Most games draw 2 maybe 2.5 amps, or less if you use LEDs for the GI.

Quoted from vid1900:

It could be a few different things.
Having dedicated circuits, with new 20A duplexes, new tight connections, solid grounding and a new breaker will be a great start.

Quoted from vid1900:

It could be a few different things.
Having dedicated circuits, with new 20A duplexes, new tight connections, solid grounding and a new breaker will be a great start.

Quoted from vid1900:

Grounding gives a safety path back to the neutral buss bar in the panel.
As you have heard 100000 times, electricity likes the path of least resistance, so the safety ground is a better path than you are, in case of a fault.
Make sure all your games have 3 prong grounded power cords on them.
https://pinside.com/pinball/forum/topic/replacing-line-cords-plugs-wall-sockets-vids-guide

Quoted from vid1900:

Like your satellite box draws the same amount of current, whether it's on or off.....

Quoted from markmon:

Disagree. I have several williams games that reset in that state but when limited to 4 per 20 will never reset. (TZ, Shadow, STTNG). I think it varies game by game so to be safe, 4 per 20 is a good rule.

Quoted from DaveH:

Phew! You had me worried when you said you were an accountant and doing this yourself. Electrical work is something that I almost always farm out. Sure, I'll swap out switches for dimmers or replace ceiling fixtures, but the real stuff gets a pro. Better safe than sorry with electricity.

Quoted from SealClubber:

I would hire an electrician and ensure the wiring is to code.

Quoted from Platypus:

I work as an electrician, It sounds like your old flicker problem has to do with a loose connection in the circuit somewhere, like an under tightened screw or poor wirenut splice, or connection in the panel like Stangbat mentioned above. Such problems are not unlike old and worn out connectors on your boards. Those back wired outlets where you just push the wire in the hole are junk and notorious for such problems, under heavier loads they loose their grip and conductivity. I always use "spec" or commercial grade receptacles as they hold up longer and "grip" the prongs tighter.
If you have six machines I would recommend four or more duplex receptacles on that one circuit. gives room for expansion and eliminates need for splitters or powerstrips.

Quoted from Platypus:

Oh that's funny, from your photo I thought you were a gynecologist.

Quoted from Lonzo:

I am building a new house with a dedicated gameroom. I had the electrician install 6 twenty amp circuits and I am planning to run 3 machines on each circuit. I figured that was conservative but would rather over do it than come up short. Also each circuit is controlled by a switch in the closet behind the bar.