At our main bin set up we run 2 shivvers units.  We have a 400 amp service, here is how the set up is divided---

                      Meter

              /                        \

 200amp box                        200 amp box

    l                                         l

Shivvers 1                             Shivvers 2

2-10hp fans   78amps         2-10hp fans         78amps

5hp motor      30 amps         5hp motor           30 amps

2hp motor       12 amps         2hp motor           12 amps

1hp motor        7 amps           1hp motor           7amps

                     ______                                    ______

                  127amps                                    127amps

Total of 254 amps not counting a couple of 1/2 hp spreader motors. 

This is if everything is running at one time, which it can be if grain is transferring.

 I have two questions-I don't have any cooling fans running with the above scenerio, can I run another fan(or two) at 40 amps each?(this is the first year I have had 2-10hp fans on the dryers).  I don't want to blow anything because if the power company comes out they would install a demand meter.  I know I don't want that.

Second quesiton, I have a meter that clamps around the wire to tell amp draw, a guy in town said he thought you just took the amps from one wire to tell the usage, but I think you should take the amps from both hot wires and add them together.  Which is right?

Oh yea, this is single phase.  Wish I had 3 but it is 2.3 miles away.