Still trying to figure out what part of the code these "steam units" fall under. See the code forum.
Disconnect within site of equipment or controler, and in some cases be able to locked open.
And 427 requires:
"disconnecting means shall be of the indicating type and shall be provided with a positive lockout in the “off” position."
Sounds like either way it may need to able to locked open.... Then again I have always done them with a lockable fusable disconnect switch, when I thought they were under a different code....
"Well - I oughta....." -Jackie Gleason