Which of the following is not part of the electrical layout planning process?

The electrical layout planning process primarily involves several preparatory steps that help ensure the successful installation of electrical systems. Among these steps is the necessity to identify potential conflicts or collisions with other trades' equipment, determining the appropriate wiring methods to be used, and marking locations for devices or boxes.

Installing electrical panels is not considered part of the planning phase; rather, it falls under the execution phase of the project. During layout planning, the focus is on strategizing and arranging all the components that will need to be installed, ensuring that everything is coordinated effectively. Once planning is complete, the actual installation work, such as putting in electrical panels, takes place.

Thus, while the other options relate directly to preparatory and logistical considerations in the planning process, the act of installing electrical panels signifies a step beyond planning and into active implementation, making it the correct choice for what is not part of the electrical layout planning process.