Motors in power calculations

[Phatso86]

I am confused how to use this info.

When a HP power rating is given, must I ALWAYS assume it is output rating?

so a 100hp motor w/ 80% efficiency requires 125hp of power?

I just want to confirm what I think I need to assume for a related question

 

[Flyer_PE]

Motor horsepower is always brake horsepower (bhp) at the output shaft.  The person specifying the motor is primarily concerned with matching it to the load it needs to spin.