Question

which one of these additional methods most effectively protects machines, tools, and operators against damage from electrical current?
service and equipment grounding
complete isolation
battery back - up systems
gloves and non - conductive shoes

Explanation:

Service and equipment grounding provides a low - resistance path for electrical current in case of a fault, diverting it safely to the ground and protecting machines, tools, and operators. Complete isolation is difficult to achieve in real - world scenarios. Battery backup systems are for power outages, not protection from electrical current faults. Gloves and non - conductive shoes mainly protect operators but not machines and tools comprehensively like grounding.

Answer:

Service and equipment grounding