I'm wiring up an arcade cabinet for power supply. Looking through several vendor's schematics, there appears a few design philosophies and would love to get some feedback on the best options. I created diagrams, below, based on the major topologies I found.

I'm thinking the best option would be the "Qix - Taito" one, for a few reasons:

1. Fuse protects everything downstream, including the EMI filter
2. The Interlock switches cuts both Line and Neutral feeds downstream, to lessen the likelihood anything maybe energized if the power On/Off was in "Off" if someone gets into the cabinet for maintenance.

Am I missing anything or making bad assumptions?

 

Where are you located?
Local Regs can differ between countries.
Here in N.A. the NFPA79 and NFPA70 are the governing regs for Industrial cabinetry.
P.S. By the socket, it appears to be N.A. so you do not necessarily required to switch a grounded neutral. also use a polarized plug!.

 

If the AC service lines and plug are wired correctly you don't need to switch NEUTRAL.

However, QIX is the proper way. Note that the fuse is the first item when LIVE comes in.

 

If the AC service lines and plug are wired correctly you don't need to switch NEUTRAL.

However, QIX is the proper way. Note that the fuse is the first item when LIVE comes in.

Makes sense. Where this game will end up, I have no idea and probably cannot trust if the supply wiring is correct. Appreciate the response!

 

Where are you located?
Local Regs can differ between countries.
Here in N.A. the NFPA79 and NFPA70 are the governing regs for Industrial cabinetry.
P.S. By the socket, it appears to be N.A. so you do not necessarily required to switch a grounded neutral. also use a polarized plug!.

I'm in the US, Not familiar with the NFPA70,79 but will look that up

 

There is a copy out there for NFPA79 , the NFPA70 is NEC (Electrical code),

 

There are, or at least there were, places where neither side of the AC power was a "grounded neutral" conductor, and so there was always a voltage between either side and earth "ground". This also existed in some industrial electrical control system power arrangements, at least in systems that I was involved with, back in the 1970's era. Thus all of the AC control system wires were red.
The primary reason for only switching one side of the power is to reduce the cost, not because it is better.

 

There are, or at least there were, places where neither side of the AC power was a "grounded neutral" conductor, and so there was always a voltage between either side and earth "ground". This also existed in some industrial electrical control system power arrangements,

This was shown to exist back in the 50's as per the JIC recommendations for 120v control circuits that were for e.g. derived from a 460v-120v control transformer etc using an ungrounded secondary.
In this case, it was mandatory to use fusing in both AC supply lines,
Since the NFPA79 regulations came into effect, the practice now is to earth ground one side of the 120v secondary essentially making this conductor a non-fused "neutral".

 

The systems that I was associated with, as well as those that I designed per customer specifications, were done after 1975. They were for production equipment in auto plants. The explanation was quite valid, in that an accidental "grounding" of one wire will not disable the machine, but would provide a warning via the "ground detect lights." It made sense back then, it still makes sense today.