Delta High Leg with Control Wire Question

[kwired]

Is this a decent explanation to explain for someone to understand

You can connect the equipment to a 3 Phase Breaker
But internally we do not know how the control circuit is wired.
The equipment internally can be Connected to Phase A and B to run the equipment and then Phase C is the control wiring. If this is the case, then the equipment will not work.
But if the equipment internally can be Connected to Phase B and C and then Phase A is the control wiring, then the equipment will work.
To determine this, you would typically require access to the equipment schematics to understand the precise connection of the control circuit.

Is not really a normal practice to connect something to two phases but have the controls be the only thing connected to a third phase.

Is common to have two or three ungrounded conductors and sometimes include a grounded conductor in a supply circuit and tap the controls from any two conductors depending on voltage required by control circuit. A lot of industrial type equipment simply uses a control transformer with primary side connected to any two ungrounded supply conductors. That situation eliminates any concern of whether or not a high leg is even involved, or even doesn't matter if supplied by corner ground or ungrounded delta systems.

 

[petersonra]

I need you to assist here in verifying all your 3 phase kitchen equipment, which supply power from A panel to be powered by a 120/240V delta high leg C phase electrical service. They cannot have controls powered by C phase which is the high leg and meters 240V from phase to ground.
This needs to be confirmed for any single phase or 3 phase piece of equipment powered out of the 3phase 600amp panel A with Delta High Leg on C.

How can the high leg be 240 V line to ground? Should be 208 V.

You should have 240 V from any phase to any other phase.