Grounding a Panel with Two Power Inputs

[JoshuaW]

My panel has a 20amp 120v input, which is used for constant power for my BCS, as well as to power the 120v portion of my RIMS tube. It also has a 240v 50amp input for my HLT, BK, and 240v segment of my RIMS.

Im trying to solve the problem of safe/sane grounding for the 20amp circuit. I already have all of my grounds running through the 50amp, but if the 50amp is unplugged for any reason, that leaves me unprotected in the event the 20amp somehow energizes the panel enclosure. However, if I ground the enclosure to the 20amp as well and something goes wrong, I could have 50amps flowing through the ground of my 20amp circuit!

I can obviously never use it without both power sources, as intended, but I am trying to idiot proof it as well. Any solutions?

 

[Bill_in_VA]

Tie all the grounds together.
You could never have 50 amps flowing down the 20 amp when the 50 amp is unplugged.

 

[JoshuaW]

Tie all the grounds together.
You could never have 50 amps flowing down the 20 amp when the 50 amp is unplugged.

I feel like such an idiot. Duh!