Where two internal cable clamps are present in a box, a ___ conductor volume allowance will be counted towards the box fill calculation, based on the largest conductor in the box.

When calculating box fill for electrical boxes, specific rules apply regarding conductor volume allowances. In the case where two internal cable clamps are present, it is essential to understand how the volume allowances are determined based on the largest conductor in the box.

The correct context here indicates that only a single conductor volume allowance is counted towards the box fill calculation for those two clamps, regardless of the actual number of clamps present. This means that while there may be two clamps, only one allowance is added to the total volume based on the size of the largest conductor. This is an important guideline for ensuring regulatory compliance and proper electrical box sizing in electrical installations.

Understanding this principle helps ensure that the box does not exceed its allowed volume, which is critical for safety and functionality in electrical circuits. Thus, the correct answer reflects the appropriate application of the rules governing box fill calculations.