Every socket, fixture and appliance you drop onto the electrical & plumbing layer is connected to a circuit. The simulation adds up the circuit's power and calculates the current, the breaker, the cable size and the voltage drop at the end of the line. The calculation runs in the editor's Simulation step, on the lines you draw; an overloaded line or one over the limit shows up in color on the plan, so you see it before you even call the electrician.
The simulation runs in the editor's Simulation step: it reads the symbols and the lines you draw and calculates with typical power ratings; if you like, you replace a symbol's power with your own appliance's. Results are listed circuit by circuit; the report can be printed or downloaded as CSV.
Every symbol has a power rating: socket 300 W, double socket 600 W, light fixture 60 W, oven 3,000 W, induction hob 7,200 W. A socket next to a washing machine or oven counts as that appliance. The total of the symbols on a circuit is converted into a design current; you can change the value in the right panel to match your own appliance.
The breaker comes from the circuit type: lighting and combi boiler B10; sockets, washing machine, dishwasher, air conditioning and water heater B16; oven B20; induction hob B40 on single-phase, 3 × B16 on three-phase. The type is worked out automatically from the connected appliances. When the breaker load exceeds 80% it turns yellow, above 100% red; you're asked to split a circuit that's over.
The cable size is first chosen to carry the breaker: 1.5 mm² lighting, 2.5 mm² sockets, 4 mm² oven, 10 mm² single-phase induction hob. If the installation method, ambient temperature and number of circuits on the same route lower the current-carrying capacity, or the voltage drop limit is exceeded, the cable size increases automatically.
The circuit's length is measured on the plan and the voltage drop at the end of the line is calculated. The limit is 1.5% on lighting and socket circuits and 3% on motor circuits (air conditioning) (Turkish Electrical Installations Regulation, Art. 57); on a line over the limit, the cable size automatically goes up one step.
Not all appliances run at the same time. Circuit loads are summed with a demand factor (0.7 for an apartment), and the feeder and main switch are suggested accordingly: C40 · C50 · C63 on three-phase, C40 · C63 on single-phase. Socket and wet-area circuits get a 30 mA RCD, one per four circuits.
Oven and washing machine on the same circuit, more than eight sockets on one socket circuit, a line without RCD protection in a wet area, a lighting circuit longer than 25 meters, a line passing through a reinforced concrete column or beam: all are marked on the plan; a route around the column recalculates the take-off and the voltage drop. Column–wiring check →
The values the simulation uses by default. The circuit type is worked out automatically from the connected loads (a socket next to the oven becomes an oven circuit); you can change it in the circuit's properties.
| Circuit | Cable | Breaker | Note |
|---|---|---|---|
| Lighting | |||
| Room lighting circuit | 3 × 1.5 mm² | B10 | One or two rooms combined; up to 12 light fixtures |
| Socket | |||
| General socket circuit | 3 × 2.5 mm² | B16 | Up to 8 sockets per circuit; a separate circuit per room is recommended |
| Kitchen worktop sockets | 3 × 2.5 mm² | B16 | Separate circuit; small appliances go here |
| Washing machine | 3 × 2.5 mm² | B16 | Each machine on its own circuit |
| Dishwasher | 3 × 2.5 mm² | B16 | Each machine on its own circuit |
| Power | |||
| Oven | 3 × 4 mm² | B20 | Separate circuit, direct connection or power socket |
| Induction hob | single-phase 3 × 10 mm² · three-phase 5 × 2.5 mm² | B40 · 3 × B16 | Separate circuit; on a three-phase supply it's connected to all three phases, with the load split evenly across them |
| Air conditioner | 3 × 2.5 mm² | B16 | Separate circuit for each indoor unit; mind the distance to the outdoor unit |
| Water heater / electric heater | 3 × 2.5 mm² | B16 | Separate circuit; RCD protection mandatory in wet areas |
| Combi boiler | 3 × 1.5 mm² | B10 | Separate circuit, earthed |
| Distribution board | |||
| RCD | — | 30 mA | Socket and wet-area circuits; one RCD per four circuits |
| Supply riser (meter → board) | single-phase 3 × 10 · 3 × 16 mm² | C40 · C63 | Based on the total load found with the demand factor; three phase: 5 × 10 mm² C40, 5 × 16 mm² C50, 5 × 25 mm² C63 |
The values reflect common residential practice; local regulations, the utility company's specifications and the engineer's decision take precedence. Aluminum conductors, surface installation and high ambient temperatures reduce capacity.
It starts with defaults; you change them for the whole project or for a single circuit to match conditions on site.
Place the distribution board on the electrical & plumbing layer and run lines to the rooms with the circuit tool. When a circuit point lands on a symbol, the symbol is connected to that line; you can change which breaker feeds it in the circuit's properties. The circuit type (lighting, socket, power) determines the cable and the breaker.
Every symbol comes with a typical power rating: socket 300 W, oven 3,000 W, induction hob 7,200 W. If you enter the power (W) from your appliance's label in the symbol's properties, the simulation recalculates instantly.
The circuit list gives the current, breaker, cable size and voltage drop; any line over the limit shows up in color on the plan. The report can be printed or downloaded as CSV; the breaker, cable size and cable take-off also go into the MEP sheet, and that is what goes to the electrician.
With a separate calculator, you enter the length as a guess. Nodaform measures circuit length from the line you draw on the plan; when you move a socket or change the line, the calculation updates itself.
Plan and furniture layers. The electrical & plumbing tab is locked; you can review the distribution table on this page.
Electrical & plumbing layer: sockets, switches, lighting, distribution board and circuits; wall view in 3D; circuit list and board diagram on the MEP drawing sheet.
MEP sheet: breaker and cable size from the circuit type, cable and conduit take-off, main switch, RCD and number of distribution board modules; with default conditions. Voltage drop percentages and warnings are on Ultimate.
Plan-linked load, breaker, cable size and voltage drop; your own cable type, installation method and phase; warnings on the plan, revision difference, report and writing to BIM properties.
The breaker comes from the circuit type (lighting B10, sockets B16, oven B20, induction hob B40 or 3 × B16 on three-phase). The cable size is chosen to carry the breaker; if the installation method, ambient temperature and number of circuits on the same route lower the current-carrying capacity, or the voltage drop limit is exceeded, the cable size increases automatically.
Following Article 57 of the Turkish Electrical Installations Regulation, Nodaform uses 1.5% for lighting and socket circuits and 3% for motor circuits (air conditioning) as warning thresholds. On a line over the limit, the cable size automatically goes up one step.
Yes. When you select a three-phase supply, circuits are assigned from largest to smallest to the least loaded phase; the induction hob is connected to all three phases. Phase imbalance is shown as a percentage in the simulation panel.
No. The results are a pre-check to discuss with your electrician and electrical engineer; the construction design and approval belong to a licensed engineer.
Plan-linked voltage and load simulation is on the Ultimate plan; it runs in the editor's Simulation step, without opening a separate tool. The MEP sheet on Pro also gives you breakers, cable sizes and cable take-off; voltage drop percentages, warnings and your own conditions are on Ultimate.
Open a free account and draw the plan; drop in the sockets with Plus, and once you move to Ultimate, breaker, cable size and voltage drop calculations appear automatically on the same plan.
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