Which of the following is NOT included in the requirements of working space around electrical equipment?

The correct answer is based on the fact that the National Electrical Code (NEC) specifically outlines requirements for working space around electrical equipment related to physical dimensions and safety. These requirements include considerations for height and width, ensuring that there is adequate space for personnel to operate and maintain the electrical systems safely. Additionally, the NEC addresses space usage, clarifying that work areas should not be used for storage of materials that could obstruct access to electrical equipment.

Color coding of equipment, while an important practice in certain contexts for identifying circuits and ensuring safety, does not fall under the NEC's requirements concerning the physical working space. The NEC focuses on the dimensions and configuration of the working space, making color coding extraneous to those particular stipulations. Thus, it stands out as the correct choice for what is not included in the requirements for working space around electrical equipment.