First of all (since I'm a newbie on this forum), greetings to all forum members! You're doing a great job! Not to mention the work doug293 is doing, amazing indeed!
I'm planning to build the same electric system for me and have a question/dilemma regarding the SS interlock - namely, I would like to understand how does it work? (Since the level of my electric skills is next to nothing, this question most likely sounds bizarre, I'm aware of this.)
Also, I have to mention that I'm living in Europe so I'm using a 230V electricity with 3 power lines: line, neutral and ground. For that reason, some modifications have to be done in the scheme. For example: at both contactors and at the element receptacle, line 2 has to be replaced with neutral; and at the pump receptacle, line 2 is replaced with line 1, am I right?
Now the main question - functioning of the SS interlock. I do understand that the voltage for SS interlock is running through the blue power line, through NC ports of pump- and element switches before coming to one of the two NO ports of the main switch. When the main switch is turned on, voltage, provided by the blue line, reaches the coil of the contactor, resulting in the electricity being able to run through the contactor (namely through the "line" and "neutral" lines in my case) to the rest of the power circle, including the voltage to flow to the main switch through the line with 1 amp fuse (written at the right of the main switch). My concern is if there is no issue since now the electricity can run through the both NO ports of the main switch through two power lines simultaneously: throught the blue line and at the same time through the above mentioned line with 1 amp fuse, which is supplied with electricity, coming from the opened contactor, is that correct? Hopefully I described my concern correctly.
But since I'm sure this wiring scheme has been tested several times, I'm also sure I've missed something in my understanding so I would be grateful for the explanation.