It is perhaps worth noting that on the power management board above the wiring as supplied/manufactured was “unconventional” when I checked it.
Connections to the board WERE, in reading order from left to right…
- Live in (supply)
- Neutral in
- a red wire to the PSU, presumably live out… WRONG
- a black wire to the PSU, presumably neutral… WRONG
I checked the board and noticed that pins 2 and 3 are connected, and therefore pin 3 is neutral out and pin 4 is switched live out via the relay.
To modify the wiring both to bypass the power switch board and to improve the conventional wiring colors for safety I performed the following modifications…
Removed the Red wire from pin 3 going to the PSU and commoned it onto terminal 1, (Live in).
Removed the Black wire from pin 4 going to the PSU and connected it to terminal 3 (common Neutral in).
As someone who used to layout PCBs from time to time, it’s generally good practice to keep to a certain convention of left to right terminal wiring rather than use the “mirrored” approach, though this can sometimes be found on low cost single sided circuit boards (or with lazy designers) as it makes layout somewhat simpler.
Its certainly bad and potentially dangerous to switch the convention of wiring colors within a mains power system.