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Hello, on three phase systems, two of the legs will read 110v (approx) to ground and one of the legs will read 220 volts or a bit higher to ground...that is called the 'high leg' or the 'stinger' generally.
You should read 220v approx across all three combinations including the stinger however.
Check that at the 3 phase breaker, if you have those readings there, the problem is closer to the unit you are powering, perhaps a blown fuse in one or two of the legs, or a bad magnetic starter on the motor (try pressing its reset button)... and check power across L1,L2, and L3 at the line side of the magnetic starter (if its a motor).
We can go from there
OK, I will be here all day.
Thanks, ***** ***** have no power at all across any of the outlet terminals, then it is most likely that you are on the wrong 3 phase breaker or there is a disconnect switch between the griddle outlet and the breaker.
IF you have some power across any two terminals at the griddle outlet then there is a bad wire somewhere between the breaker and the outlet.... sometimes junction boxes with splices in them get hidden, sometimes inside a wall.
I need to know in detail what sort of voltage, if any, you are getting at the griddle outlet.
It is hard to get good contact with meter probes in some receptacles, does the griddle work now?
Sometimes the prongs on the cord cap do not make good contact inside the receptacle...you and twist them slightly to fix that. Beyond that there would likely be burnt wire connections inside the griddle, often at the electric heating elements.
Let me know how it goes, if you have power to the receptacle you would have power to the griddle, assuming the prongs on the plug are making good contact.