The selection of a conductor is based on the ? requirements of the circuit.

• A. Ampacity and Voltage
• B. Amperage and Resistance
• C. Heating and Cooling
• D. Location and Environmental

Answer: (A)

The main idea is that conductor sizing is driven by how much current the circuit will carry and the voltage level it must withstand. The ampacity, or current-carrying capacity, sets how large a conductor must be to carry the expected load without overheating. The voltage requirement matters because the insulation and the conductor must be rated to handle the system voltage; insufficient insulation can lead to breakdown or arcing. The other notions—amperage and resistance, heating and cooling, or location and environment—touch on related ideas but don’t define the core basis for selecting a conductor.