A la ITC-BT-9 diu que en el cas que s’utilitzin interruptors diferencials al quadre de protecció i control s’haurà de tenir molta cura amb la seva tria i hauran de ser de tipus selectiu (S). Per quin motiu?

Which describes careers that have similar education requirements but different qualifications? product safety engineers and materials engineers industrial safety engineers and industrial health engineers quality control systems managers and inspectors industrial safety and health engineers and hand packers