Autodesk Updated RVT_ELEC_01101 Exam Questions and Answers by taylor

The parameter “Lighting Calculation Luminaire Plane: Not Computed” in the Space Properties dialog appears when Revit cannot perform a lighting calculation because no valid lighting fixtures are present within that defined space.

According to the Autodesk Revit MEP User’s Guide (Chapter: Spaces and Lighting Analysis):

“Lighting calculations are performed based on the luminaire data available in the space. If no light fixtures are present, the parameter ‘Lighting Calculation Luminaire Plane’ displays as ‘Not Computed’. Revit requires at least one hosted or ceiling-mounted lighting fixture with a valid light source to calculate illumination.”

In this case, although the space has defined reflectance values (ceiling, wall, and floor) and a lighting calculation workplane height (2’-6”), Revit cannot compute the Luminaire Plane because the software has no lighting geometry to reference for the photometric analysis.

Explanation of incorrect options:

A. Missing IES file: This would cause inaccurate photometric output, but not “Not Computed.”

C. Lights not circuited: Circuiting affects load summaries, not lighting calculations.

D. Lights at different elevations: Revit still computes the average luminaire plane even with varied fixture heights.

Thus, the lighting calculation is not computed simply because no lighting fixtures are placed in the space.

When working in a workshared Revit model, elements without ownership can be visually identified using Worksharing Display Settings.

As per Revit MEP Worksharing Guide – Worksharing Display Modes section:

“Worksharing display modes include options such as Checkout Status, Owners, and Worksets.

The Checkout Status mode shows elements that are not owned or are available for editing.

The Owners mode highlights elements based on who owns them, allowing unowned elements to appear as ‘none.’”

Therefore:

✅ B. Checkout Status — shows elements that are editable or not owned.

✅ E. Owners — displays which elements are owned and highlights those without ownership.

Incorrect options:

A. Worksets: Shows which workset an element belongs to, not ownership.

C. Gray Inactive Worksets: Only grays out inactive worksets.

D. Model Updates: Not a valid worksharing display setting.

In Autodesk Revit Electrical Design, a lighting device (switch) must be associated with lighting fixtures through a switch system, not through electrical circuits. Switch systems are independent of lighting circuits and wiring, as they are intended to represent the control relationship between a light switch and the lighting fixtures it operates.

According to the Autodesk Revit MEP User’s Guide (Chapter 17 – Electrical Systems, pages 475–478), the official method is described under “Creating a Switch System.”

“You can assign lighting fixtures to specific switches in a project.

The switch system is independent of lighting circuits and wiring.”

(Revit MEP User’s Guide, p. 475)

“To create a switch system:

Select one or more lighting fixtures in a view, and clickModify | Lighting Fixtures tab ➤ Create Systems panel ➤ Switch.

Click Switch Systems tab ➤ System Tools panel ➤ Edit Switch System.

Click Add to System, and select one or more lighting fixtures.

Click Select Switch, and select a switch in the drawing area.

Click Finish Editing System.”**(Revit MEP User’s Guide, p. 476)

How It Works:

The switch system links a lighting device (switch) with lighting fixtures, enabling Revit to manage how light fixtures respond to specific switches.

Unlike electrical circuits, which define power flow and load connections to panels, the switch system defines control logic (which lights are turned on/off by which switch).

The designer begins by selecting the switch and then adding lights to its system, ensuring all lights associated with that switch are grouped correctly.

Supporting Extract from Revit Documentation:

“You can also create a lighting switch system by right-clicking the connector for a lighting fixture and clicking Create Switch System.”

(Revit MEP User’s Guide, p. 475)

“Add lighting fixtures to the switch system…

Click Select Switch and select a switch in the drawing area.”

(Revit MEP User’s Guide, p. 476)

“The switch system is independent of lighting circuits and wiring.”

(Revit MEP User’s Guide, p. 475)

Conclusion:

To associate a lighting device (switch) with light fixtures in a Revit electrical model, the designer must create a switch system. This is done by selecting the switch, then adding the desired lighting fixtures to that system using the Add to System and Select Switch tools under the Switch Systems tab.

In Revit, when a designer nests a Generic Annotation family (such as a receptacle symbol) inside an Electrical Fixture family, and that annotation includes a label, the label value cannot be changed directly in the project unless the parameter controlling that label is properly associated (linked) to a parameter in the host (electrical fixture) family.

According to Autodesk Revit Electrical Design documentation, under “Creating Family Parameter Links”, it is explicitly stated:

“By linking family parameters, you can control the parameters of families nested inside host families from within a project view. You can control instance parameters or type parameters.”

The procedure describes the correct process to make the label value editable in a project:

“Click the button next to a parameter that is of the same type as the one you created in Step 6. For example, if you created a text parameter, you must select a text parameter here. In the dialog that displays, select the parameter you created in Step 6 to associate it with the current parameter, and click OK.”

“The nested family changes according to the value you entered.”

This means that the designer must associate the nested family’s label parameter (usually a text parameter controlling the annotation label) to a corresponding parameter in the host electrical fixture family. Once linked, this host parameter appears in the project’s Properties palette, allowing the designer to change the label value directly.

Other options—such as creating formulas, modifying visibility, or enabling “Shared”—do not make the label editable in the project unless the parameter link is established.