Travis Brungardt, a master electrician and remodeler, discusses the importance of box fill calculation in electrical installations. Different types of boxes have varying cubic inch volumes, and understanding the value of conductors and devices in each box is crucial for compliance with building codes. Conductors have specific cubic inch values based on their gauge, and additional considerations must be made for grounding conductors and devices. By following basic math principles and code guidelines, builders can ensure safe and legal installations for their clients. Check out Travis's new series "Prairie Sun and Timber" for more insights into high-performance house construction. Subscribe to The Build Show for more expert advice on construction topics.