My point is that electricians work in live panels all the time. (And the voltage of the circuit being installed does t matter. No matter what you install, the

My point is that electricians work in live panels all the time. (And the voltage of the circuit being installed does t matter. No matter what you install, the panel has 240V with approximately zero output impedance. I don’t know what advice an electrician would give, but the advice I give is that if you don’t feel like you can safely install a new circuit on a live panel, you probably just shouldn’t install new circuits.