If you have LOTO'd the mainline disconnect but there is still power to the cam, which circuit is still hot?

The situation describes a scenario where the mainline disconnect has been locked out and tagged out (LOTO), meaning that power should theoretically be cut off at that point. However, if there is still power to the cam, it indicates that there is an additional power source providing electricity to that component, which is most likely not affected by the disconnect.

In this context, the mainline disconnect is intended to cut off the power from the primary source to the entire system, including all components like the cam. If the cam has power despite the LOTO of the mainline disconnect, it suggests that there is another circuit capable of supplying power to the cam.

The control power circuit often provides power for control functions and can operate independently from the main power circuit. Therefore, this means that the control power is still active, allowing the cam to receive power even after the mainline disconnect has been locked out.

Thus, considering all of this, the presence of power at the cam indicates that it is the control power that remains active, allowing the cam to operate despite the mainline disconnect being engaged.