How many volume allowances must be made for each device in an outlet box?

Each device in an outlet box typically requires a specific volume allowance to ensure that the box has sufficient space for safe and code-compliant wiring. The correct answer indicates that for each device, a volume allowance of two cubic inches must be included. This requirement is in line with electrical code standards, which stipulate that the volume of the outlet box must accommodate not only the wires but also the devices to prevent overcrowding, which can lead to overheating and potential fire hazards.

Using this volume allowance ensures that any heat generated from electrical devices can dissipate adequately. By adhering to this standard, electricians and builders contribute to the overall safety and reliability of the electrical system, maintaining a crucial aspect of electrical design and installation practices.