Cranes

[Nick timas]

Two cranes are supplied by a common conductor system, both cranes have one 10 amp rated motor and one 20 amp rated motor. What is the minimum required ampacity of a common conductor system? Can you please explain how you got your answer, thanks

 

[don_resqcapt19]

125% of the code FLA for one of the 20 hp motors plus the sum of the code FLA for the remaining motors, unless there is some type of interlocking that limits the number of motors that can run at the same time.

Forget about that...there are special rules in Article 610 that apply here.

 

[mgookin]

Two cranes are supplied by a common conductor system, both cranes have one 10 amp rated motor and one 20 amp rated motor. What is the minimum required ampacity of a common conductor system? Can you please explain how you got your answer, thanks

Is that a test question?

 

[Nick timas]

Yes

 

[zbang]

Please let us know your answer and how you got it.

 

[JFletcher]

125% of the code FLA for one of the 20 hp motors plus the sum of the code FLA for the remaining motors, unless there is some type of interlocking that limits the number of motors that can run at the same time.

Forget about that...there are special rules in Article 610 that apply here.

OP didnt mention HP, just current draw.

 

[jusme123]

610.14(E)(3)