Utility Throttles – You Won’t Regret It! - comment by carrie

Mauricio,
 
The solution is to use two levels of throttles:  Utility throttles for all users, then workload throttles on workloads that only specific users classify to. 
 
This approach is explained in another of my blogs titled: 
 
Two Levels of Concurrency Control for Load Utilities in Teradata 13.10
 
However, you must be on 13.10 or above for this to work.   For this to work you must add classification to a workload specifying which users you want to manage there and also "utility type", then only those users and only utility jobs of the type you specify will classify to that workload. 
Thanks, -Carrie