Hot and neutral must be carried in the same cable.
This is the setup you have. If your smart switches require a neutral then you are out of luck. You have a switch loop. No neutrals are present at...
What could cause it? Many things. A blockage. https://www.selfhelpmega.com/wiringdoneright/4way/powerfixtureto1st/pwfxfd1st2.jpg Undersized sewers...
Depending on the type of 'stiff tubes' you have just cut them off at the proper height and install shut off valves. Copper is easy to work with....
The ground and neutral are connected for one reason. That is to give the current a return path to trip the breaker if the hot should come in...
The ground does not ever carry current except in a fault. At least it is not supposed to. Current on the neutral in a standard home installation...
Adding up breakers means nothing. Your panel is not using the full value of the breakers. Also your panel is not divided down the right and left...
Hots on opposite legs of the service can share a neutral. It is called a multi wire branch circuit(MWBC). It has special rules including one that...
Definitely not allowed since the neutral would then be possible to carry the full current of both circuits. That means that if the two hots were...
A home inspector would be a good start; the type you you hire when you are going to buy a new house. Explain to him/her that you are not selling...
Your voltage readings indicate the neutral wire is open. Look for an open connection between the light and the panel.
Any voltage you are reading with the digital meter below 10 volts is zero. Power is coming out of the breaker OK. You need to trace the circuit...
It's even easier to put a voltmeter on the breaker screw and check for voltage.
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