Part of the TBM, Time Based Maintenance, is to plan your periodic tests for each HV asset, as part of three level maintenance annual plan.
The Basic plan, is the common–first test level to perform for your HV asset, which enable to determine your other activities, repairs, tests and use policy at the upcoming year.
This is your first floor block in your maintenance tests and repair agenda.
The Basic test level gives you 'rule of thumb' of the general situation of your asset.