If I have a 200 amp box , am I limited to the total of breaker amps or the total of actual amps used or total of amps used at one time. EX; 50 amp breaker for a 40 amp max circuit etc; John

I have a split receptacle controlled by a single pole end of run switch. The half that is constant hot works O.K. The switched half is not working. The outlet has a black, red, shared white neutral and bare ground. If it matters this is an isolated ground recept. The tab on the outlet is broken off. Voltmeter shows 35V at the red wire and 120V at the black. Switch which has a black and a white wire checks O.K. for continuity. In the off position sw shows the same 35V at the black wire. In the on position I have 120V at the white wire. I don't know if this outlet ever did work correctly. Outlet and switch have both been replaced. Why would I be getting 35 V???? What am I missing? Everything else works O.K. Please help. P.S. This site is great!!!!!!!!!!!