For a 26-foot length of Type AC cable, what is the required number of additional supports between #1 and #2?

To determine the required number of additional supports for a 26-foot length of Type AC cable, it's important to refer to the National Electrical Code (NEC), which outlines the support requirements for various types of wiring methods.

For Type AC cable, the NEC requires that it be securely fastened at intervals not exceeding 10 feet. This means that for every 10-foot section, you need at least one support. In a 26-foot run, you would cover the first 10 feet with one support, the second 10 feet with a second support, and reach the 20-foot mark. The remaining 6 feet would require one additional support to be compliant with the NEC's provisions.

Since the first two supports would be for the lengths covering 0-10 feet and 10-20 feet, you would need one more support for the 21-26 feet section. This totals three required supports along the 26-foot length. Thus, recognizing the requirements of the NEC allows for correct identification of the support needed to ensure safety and compliance in electrical installations.