Power supply demand for Suspended Cradle

[mohamedmoheb]

Heyy,
i have a suspended cradle that used in construction sites & it have hoist motors, wire winder motors & Trolley motors.
i need to know how i can calculate the total power demand for the basket, so that i can give the information to the customer to prepare the power sockets with same specifications.

thank you

 

[waross]

For grid service take the largest motor current at 125% and add the currents of all other motors that may run together.
For service on a large generator use the same formula.
For service on a small generator, (for generator sizing) take the largest motor current at 300% and add the currents of all other motors that may run together.

Bill
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