Which of the following factors determine conductor size?

The determination of conductor size is crucial for ensuring both safety and efficiency in electrical systems. The correct answer highlights three key factors: the load to be delivered, voltage, and mechanical strength.

The load to be delivered identifies how much electrical energy will need to pass through the conductor, directly influencing its sizing. If the conductor is too small for the load, it can overheat, leading to insulation failure or even fire hazards.

Voltage is another critical factor because it dictates the potential drop along the conductor. The conductor must be sized appropriately to ensure that the voltage drop remains within acceptable limits, guaranteeing that the receiving equipment gets the required voltage for optimal performance.

Mechanical strength is also significant, especially when considering outdoor or overhead installations where conductors are subject to environmental conditions such as wind or ice loads. A conductor needs to be strong enough to withstand these stresses to prevent sagging and potential failure.

While other choices contain components relevant to electrical theory and practical management, they do not encompass the comprehensive aspects necessary for deciding the appropriate size of a conductor. For example, factors like current and resistance are important but are inherently tied back to the load and voltage. Similarly, considering insulation type and frequency is more pertinent in circuit design and safety rather than the fundamental size requirements of