Answer: It is very necessary and important
Step-by-step explanation:
By UL standard 20, a grounding means is provided by the type of flush placed for supervising the putting in the box. In almost all the cases, grounding is done by connecting a green hexagon -shaped screw to the metal yoke of the switch. Grounding is also a means of special self-grounding it is also one of the characteristics of metal yoke and it has a copper wire joined together with a green insulin.