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Cal/OSHA requires both service and equipment grounds to ensure safety in electrical installations and protect against electrical shocks. Service grounds refer to the grounding system connected to the electrical service that helps ensure the stability of the electrical system under normal operating conditions. Equipment grounds, on the other hand, are specifically for individual electrical devices and protect them from overloads or faults.

Having both types of grounds helps create a safer work environment by providing a path for electrical faults to be redirected to the ground rather than passing through people or sensitive equipment. This is crucial in preventing accidents and equipment damage, particularly in construction and materials handling settings.

The other options do not align with Cal/OSHA requirements regarding electrical safety practices. For instance, the mention of hot and cold or colors like yellow and orange are not relevant to grounding requirements. Similarly, terms like standard and non-standard reflect categories rather than the specific types of grounding mandated for safety in electrical systems.