Emergency lighting design in Revit: splitting escape route circuits correctly

Emergency lighting design in Revit: put escape route luminaires on alternating circuits, address them, produce the cable list.

DIN VDE V 0108-100EN 1838

Why the split takes longer than the placing

Placing emergency luminaires does not take long. What takes long is deciding which luminaire goes on which circuit. In an ordinary room that is simple: everything on one circuit, short runs, done. On an escape route it is not.

A corridor or a stairwell must not go dark when one final circuit fails. That means neighbouring luminaires have to sit on different circuits — if one fails, the remaining one keeps the route lit. By hand that means walking the corridor luminaire by luminaire and assigning alternately, without losing your place at a branch or a change of storey. On top of that there is a limit on how many luminaires may hang on one final circuit.

The mistakes this produces are quiet ones. Two neighbouring luminaires on the same circuit look exactly like all the others on the drawing. It becomes visible at inspection — or not at all.

The usual route and where it ends

Normally people place first and assign afterwards, often through filters and schedules. You select the luminaires in a corridor, enter one circuit, select the rest, enter the second. On a straight corridor that works. On a corridor with branches, lobbies and two stairwells the selecting turns into fiddling, and you do it again after the next design stage.

The second usual route is assignment through Revit's own circuit management. That knows neither escape routes nor the rule that neighbouring luminaires belong apart — the order follows the selection, not the geometry of the corridor.

What the module takes over

SiBel adressieren works on the selected emergency luminaires, normally one supply area. As in the fire alarm module the tool recognises the rooms itself and tells escape routes — corridors and stairwells — apart from ordinary rooms.

On escape routes neighbouring luminaires are placed alternately on at least two circuits. That is the core of it: the position of the luminaires relative to one another decides, not the order in which they were selected. If one circuit fails, the route stays lit. In ordinary rooms the circuit stays closed, because short cable runs matter more there.

The number of luminaires per final circuit is limited and configurable. When a circuit fills up the next one starts — and the alternating pattern on the escape route is kept.

The label is written as circuit.element into the parameter GTech_kom, so 3.05 for the fifth luminaire on the third circuit. Give a superior circuit and the address becomes three-part; without one it stays two-part. After the run the tool shows which rooms it treated as escape routes — one glance is enough to check that the room naming in the model is right.

SiBel-Kabelliste builds the run list from that, and GTech SiBel beschriften places the tags on the sheet.

What has to be right before the run

Escape route recognition depends on the rooms. They come from your own model or from a linked architectural model; the link has to be loaded. And they have to be named so that a corridor reads as a corridor and a stairwell as a stairwell. After the run the tool lists what it classified as an escape route — that look takes ten seconds and replaces counting on the drawing.

The selection should match one supply area. Alternating only makes sense within what is actually supplied together; select two areas at once and you get circuits spanning a boundary that does not exist in the installation.

The parameter GTech_kom is created if needed and bound as an instance parameter to the categories concerned. Your shared parameter file is not touched — the tool works with its own temporary file and a fixed identifier, so the parameter stays the same across projects and runs.

What ends up on the drawing

After addressing, every luminaire carries its designation in the parameter, and the tags can be placed in one pass. That is the part most often forgotten after a change: the assignment gets corrected, the tag on the sheet stays and shows the old circuit. Because tag and parameter come from the same source here, running again updates both.

The cable list adds the installer's view: what is connected to what, with room and length, run by run. For the conversation with the contractor that is the document people actually use — not the floor plan.

If you work through several areas one after another, keep an eye on the numbering: each run works on its own selection. Whether circuits should be counted through across areas or start again per area is a project decision, and it is steered through the superior circuit you give.

Standards

The module is aligned with DIN VDE V 0108-100 and DIN EN 1838 — the two documents named for this tool in the shop. The alternating split on escape routes and the limit on luminaires per final circuit follow that system.

What is not taken off your hands is the professional decision: which areas are escape routes, which operating mode the system has, what duration is required and how the illuminance on the escape route is to be demonstrated. The tool carries out a decision; it does not make one.

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