Panel Board

It's impossible to second guess someone else's design. Contact the manufacturer.

Give more information like primary/secondary rated current of transformer,rated current of motor,starting method.SC level in HV switchboard etc

For transformer

primary current= 11.02A

Secondary Current = 840A

For motor

Rated Current = 260A.

For the motor you did not give the starter type which determines the starting current for which the LV breaker which feeds the motor should not trip. Do you want all 03 motors or only 02 motors to run together?. The incoming main LV breaker should carry the total current drawn by motors(2 or 3) and extra for auxiliary loads. It should not trip for motor starting current. Specify fault level at bus bars for main CB. LV voltmeter need not exceed 500V.LV ammeter for incoming CB should indicate load currents(2 or 3 motors). Regarding capacitor CB check with PFC contractor. Include an EFR and voltage monitor relay.For each motor depending on starting method CB should be selected,which should not trip for the starting current. If necessary add an ammeter.For selection of motor contactor refer manufacturer's catalogue. If you buy motor+starter you need not worry about contactor or OC relay. A single line diagram should be drawn first.

Dear Ananth,

The MCCB rating ( drawout type) for transformer is 1000 amps and it is based on transformer rating only and not based on the end load being a source. However, the rating of the transformer is based on the total connected load with diversity factor taken into account.