How to Create Circuits and Panel Loads for Lighting Plan on Level 2 in Revit MEP

Welcome back to the CAD Teacher VDCI video course content for the BIM 321 course Introduction to Revit MEP. In this next video, we'll replicate the lighting plan workflow from the first level and apply it to the second level to create our circuits and panel loads. This systematic approach ensures consistency across all building levels while maintaining proper electrical load distribution.

First, I'll navigate to my Level 2 ceiling plan. Notice that switches and electrical components aren't currently visible, so we need to adjust our view settings. I'll access the view range properties, edit the view range, and change the cut plane to 4 feet. After clicking Apply and OK, our electrical elements become visible. This view range adjustment is crucial for proper visibility of wall-mounted electrical devices in ceiling plans.

Before we begin circuit creation, let's clean up the view by hiding unnecessary elements. I'll select one GFCI outlet, right-click, and choose Hide in View > Category to remove all GFCI outlets from this view. This streamlines our workspace and focuses attention on the lighting circuits we're about to create.

Now I'll begin the systematic process of creating lighting circuits, starting with the upper area of the plan. I'll select the first group of lighting fixtures, access the Power command, select panel, and assign them to LP2. This methodical approach ensures proper load distribution across our lighting panels. Notice that LP1 is no longer available—this indicates that panel has reached capacity, demonstrating the importance of load management in electrical design.

Next, I'll establish the switch control systems. Using the Switch command, I'll select the appropriate switch and connect it to the corresponding light fixtures by picking each fixture individually. This creates the control relationship between switches and their associated lighting loads. Remember, each switch system can only control one switching circuit, so careful planning is essential.

As I continue working through the plan, I'll select groups of three light fixtures at a time, assign them to LP2 panel, then create their switch systems. The process involves selecting the lights, using the Power command to assign them to a panel, then using the Switch command to establish control relationships. When selecting switch systems, use the Tab key to highlight the entire system before making your selection—this ensures you're connecting to the correct switching circuit.

Moving to the lower portion of the plan, I'll select a larger group of five fixtures. However, I notice one light fixture is unnecessary for this space, so I'll delete it before proceeding. This kind of design refinement is common during the circuit creation process. After selecting the remaining fixtures and the switch closest to the door, I'll assign them to LP3 panel, as LP2 is approaching capacity.

The key principle here is load balancing: we want to distribute circuits evenly across panels to avoid overloading any single panel. When LP2 reaches capacity, the system automatically directs new circuits to available panels like LP3. This automatic load management is one of Revit MEP's powerful features for electrical design.

For the wall washers and accent lighting, I'll create separate circuits as these often have different switching requirements than general lighting. I'll select the wall washers, assign them to LP3, then create their dedicated switch system. This separation allows for independent control of accent and general lighting—a common requirement in modern lighting design.

When working with complex switching arrangements, you may need to disconnect and reconnect circuits to achieve proper load distribution. I'll demonstrate this by using the Disconnect Panel command to remove a circuit from an overloaded panel, then reassigning it to LP3 where more capacity is available. This flexibility in circuit management is essential for optimizing electrical designs.

For stairwell lighting, we need three-way switches to provide control from multiple locations—a code requirement in most jurisdictions. I'll select an existing three-way switch and use Create Similar to place switches at both ends of each stairwell. This ensures safe navigation by allowing users to control stairwell lighting from either level.

Here's an important consideration when working with arrayed elements: Revit's array function can limit access to certain electrical properties. If you encounter this limitation, you'll need to ungroup the array elements. Select all arrayed lights, then use the Ungroup command. This converts the array into individual elements that can be fully configured with electrical properties.

After ungrouping, I can now select all the recessed lights in the array and assign them proper electrical connections. I'll use Power to assign them to LP3 panel, then create their switch system. For wall sconces, I'll create a separate circuit with dedicated switching, as decorative lighting often requires independent control.

The final step involves selecting all wall sconces while holding the Control key for multiple selection, assigning them to LP3 panel, then creating their switch system. This completes our Level 2 electrical circuitry.

Let's zoom to extents and save our work with Ctrl+S. While this process may seem extensive, this systematic approach to circuit creation is essential for generating accurate panel schedules and electrical documentation. Professional electrical designers rely on this detailed setup to determine panel locations, conduit routing, and wire sizing—all critical elements for successful electrical installations.

In our next session, we'll advance to the physical infrastructure phase, exploring conduit routing and cable tray installation. These components form the backbone of electrical distribution systems, and proper modeling ensures coordination with other building systems during construction. See you in the next video.