Here are labels to make it easier to see what is going on:
I'll try to find a box to put the heater contactor in - the guiding principal of the 312V system is to make it very difficult for fingers to come in contact with it.
One problem has become evident - 4/0 welding cable will not fit through the strain relief fittings on the controller. I have a few options:
- Go with a short run of thinner cable (3/0 might work) - if short enough, should not cause too much of a voltage drop
- Drill bigger holes and use the 1" LiquiTight flexible conduit terminators I've used elsewhere
- Just put a rubber grommet on the 1" holes