Hi! This is my first post here. I was in doubt if I should post to the beginners or the projects area, because this is a project from a beginner, but I hope I made the right call.
My apartment has a water tank with electric heating. It has 2 heating elements, one on the top and one on the bottom of the tank (the idea is that since hot water goes up, the top one can be used for heating a smaller amount of water, while the bottom one for the main overnight heating).
I'm not happy with the way the timer works, so I'm trying to design my first high-voltage project.
There are 3 block connectors on the top of the board, the one on the left is the input from the mains, the 2 others are the output. All Neutral and Ground are connected together. Live goes through the 2 relays (+ 1 ACS712 current sensor) and then output to the first OR second output (both can never be on at the same time).
The low-voltage logic is pretty simple: just some LEDs for status, push buttons for debugging (they won't be exposed in the board), DS18x20 temperature sensors and an ESP32 for publishing some metrics via wifi.
Some measures I'm taking:
- Live comes to a manual-reset thermal cut-off (60°C / 140°C) attached to the board using plastic bolts
- Minimum 2.5mm clearance for live/neutral/ground
- 3mm track width when 13A is required (this is enough for just 5A with 1oz thickness, but see below)
- Exposed copper on those high-current tracks, so I can solder a 1.5mm² wire to reinforce those connections + tinning.
- Ground track connected to one of the mounting holes.
- Cut-out between high and low-voltage areas
- Enclosed in a IP65 plastic box
Since this is my first time dealing with a 230VA / 13A project, I'd like to know if someone more experienced can tell if this looks safe.
Thanks