What type of conductors are considered when determining conductor fill at device boxes?

The determination of conductor fill at device boxes includes all conductors, regardless of whether they have splices or terminate at the box. This comprehensive approach is essential because every conductor contributes to the overall volume and heat dissipation within the box. When calculating the fill, it is not just about the presence of splices or terminations but also about ensuring there is adequate space to accommodate all conductors safely. This includes those that might not be spliced but are still part of the electrical system, as they could influence the performance and safety of the installation. Proper conductor fill prevents overheating and allows for safe operation, making it crucial to account for every conductor present. Therefore, including all conductors, including those without splices, provides the most accurate and safe assessment of conductor fill in device boxes.