Final answer:
The essential considerations for safe use of cords and wiring are proper grounding, regular inspection, and avoiding overloading. The use of two-wire type cords is the exception as it is not always deemed unsafe, given certain design compensations in modern appliances.
Step-by-step explanation:
The question asks to identify which of the listed options is not an essential consideration for the safe use of cords and wiring. In the context of electrical safety, the three essential considerations are: proper grounding, regular inspection, and avoiding overloading.
These are important for preventing electrical hazards such as shocks and fires. Proper grounding involves utilizing a three-wire system with a ground wire to protect against shocks. Regular inspections are necessary to ensure that cords and wiring have not degraded and are still capable of safely conducting electricity. Avoiding overloading prevents excessive currents that could lead to thermal hazards.
However, the use of two-wire type cords is not always considered unsafe, as modern two-prong plugs are designed to safely fit into asymmetric standard outlets, and devices with nonconducting cases known as doubly insulated tools may still utilize them. Therefore, the use of two-wire type cords is the exception and is not necessarily an essential consideration for safe use when devices are designed to compensate for the lack of a ground wire.