BA4/BA5 person (instructed/skilled, IEC 60364-5-51)
BA4 and BA5 are classes for the competence of persons in the classification of external influences (IEC 60364-5-51, NEN 1010 §512): BA4 = instructed (adequately advised or supervised), BA5 = skilled. They are used when designing and arranging installations and rooms. The working roles for work on or near installations are defined in NEN-EN 50110-1 and NEN 3140 as instructed person (VOP, comparable to BA4) and skilled person (VP, comparable to BA5); the role only applies after a written designation by the employer.
A foreign subcontractor at an MV switching station receives a written VP designation for this installation from the installation responsible person before carrying out independent switching operations; his foreign diploma alone is not sufficient.
Treating BA4/BA5 (external-influence classification) and VOP/VP (working roles under NEN 3140 / EN 50110-1) as identical — they are comparable, but the working role always requires a written designation by the employer for the specific installation and task.
See also
- → §512.2 (AD/AE) / §411.3.3 Outdoor socket-outlets — minimum IP44, mandatory 30mA RCD and the distinction from fixed outdoor lighting (§714)
- → §131 Protection Principles
- → §411.3.2 Automatic disconnection of supply (AUV)
- → §411.3.1 Earthing and earthing systems (TN, TT, IT)
- → Bijlage A (IEC 60364-4-41) Annex A — Basic protection against direct contact, IP2X and the jointed test finger
- → §414 SELV, PELV & FELV — the extra-low-voltage measure