Voltaula is an interactive simulation platform for electrical installations, built for training and practice: equipment behaviour is physically computed, faults are diagnosed by measuring, and teachers get training tools.
Voltaula is an electrical workshop in your browser. It does not follow a script: everything you do is calculated. What you fit, how you connect it and how you tighten each terminal all go into the circuit calculation.
Consequences come from the physics. A wrong connection, a loose terminal or the wrong cable size show up as they would in a real installation: a point that does not work, a protective device that trips, a shock if you work live.
Faults are physical too. In an existing installation the defect sits in the cables and devices; no message pops up — you find it by measuring.
Instruments measure the calculated circuit, not a value prepared in advance.
Assessment looks at the result — what works and how — and at the rules of the Spanish REBT and its technical instructions (ITC).
Every rule carries its reference: the clause of the regulation or good installation practice. The Norms tab groups them by instruction, with a link to the official text.
With your email: enter your address and you get a sign-in link. If you have a password, you can use it instead.
With Google, if it is enabled for your account.
With a group code (Voltaula Study): your teacher gives it to you.
Your first task
After signing in, the new task window opens: choose the site, the type of work, the level and the mode. In learning mode you see steps and mistakes as you go; in practice there are no hints and the report comes when you submit; in an exam, a critical mistake also fails the task. The + button in the top bar opens this window again.
If you close the browser, Voltaula reopens your last attempt exactly as you left it.
The site, in the middle: the board or the floor plan. The mouse wheel zooms, dragging an empty spot pans and the fit button shows everything again. On the plan you can open each box and the panel to work up close.
The top bar: task details, working time, “Finish and submit”, power status, language, term translation, light or dark theme and the envelope to write to us.
The right panel: Task, Diagram, Log and Norms tabs; below them, whatever you have selected.
The inventory, at the bottom: tools, measuring instruments, material and what you have already fitted.
Nothing on the site is labelled: you recognise each part by sight. Hover over it to see a card with its details, and the Aa button turns labels on if you need them.
Whatever you pick in the inventory goes into your hand, and the cursor shows it. Clicking on the site opens the action menu with what that tool can do right there: tighten or loosen a terminal, strip, cut, place, mark, measure… The hand selects things and operates devices.
Material: drag a device or a box into place; choose cable by size and colour and run it along the route.
Workbench: the Site / Workbench switch takes you to the bench, where you cut cable to length, pull it into conduit and label it before taking it to the site.
Notebook: in the inventory, for jotting down readings and observations while you work.
Material used goes into the budget and every action adds working time, as on a real job.
The measuring instruments are in the inventory under Measuring. Probes go on terminals or wire ends, and the reading comes from the calculated circuit.
Before touching a live installation, do what you would do on site: switch off, lock out with the padlock, prove the tester on a live point and verify there is no voltage at the work point. Working live is recorded and the report flags it.
The +1 h under load button lets an hour of use pass, for example to see how the installation behaves with the loads connected.
The Log tab records every action and whatever the simulation has detected. When you depart from a rule for a good reason, press “Explain why” — in the log or next to the violation in the report — and write your reason.
When you press “Finish and submit” you get the report: task objectives, violations with their severity and ITC reference, working time against the standard, material used and faults found. The score comes from the objectives met minus the violations; in an exam, a critical mistake fails.
Installation: fit the panel, boxes and points, wire, connect and put the installation into service. Includes lighting circuits with different controls.
Fault finding: start from the client's complaint, reproduce the symptom, narrow it down with the protective devices and measure until you find the defect; then repair and check.
Inspection and report: nothing is repaired; you measure the installation and fill in the report, which Voltaula compares with the real installation.
Panel design: define the circuits, their protection and cable sizes, checked against the REBT.
Each type of work exists on several sites and levels; the level changes how much the brief tells you and how much there is to do.
The dashboard button in the top bar opens the teacher's tools:
Groups: an access code for students to join and email invitations.
Assignments: site, type of work, level and mode, with a deadline and number of attempts.
Live session: see your students' screens, take control, freeze the class, write in the chat or switch to exam mode.
Scenario builder: prepare your own site on a floor plan or board, with your own points, routes and faults.
Attempt review: step-by-step replay, comments and your own score.
Student explanations: see why the student did it that way and decide whether to accept the explanation; if you accept it, that violation stops costing points.
Group overview: most common mistakes and CSV export.
Teachers can connect their AI assistant — Claude or any other MCP-compatible one — and ask for scenarios in their own words. The AI creates a draft in your scenario builder; you review it and you publish it.
Permissions: when connecting you choose what to allow. Catalog, faults and REBT rules (read only, required); create and edit your drafts (on by default); assign tasks to your groups (off by default; published scenarios only, your groups only).
What the AI cannot see: students, their attempts, scores or chat; nor other teachers' drafts.
Checks: the scenario must be solvable, the faults must be noticeable and there must be no accidental REBT violations.
Control: revoke access in the dashboard → “Connected AI”; the school owner can turn MCP off for the whole school.
Server address: https://app.voltaula.study/mcp. Steps to connect and request ideas: Works with your AI.
From the app: the envelope button in the top bar opens a window to send us a message, even if you are not signed in (it then asks for an email to reply to).
Voltaula has no stored answers. What you install becomes an electrical circuit that is computed, and everything else comes from that calculation.
The installation: devices, conductors, terminals and joints, with each conductor's real length and cross-section.
The circuit: every terminal and conductor end is a node; every conductor, contact or load is a resistance.
The calculation: nodal analysis — the voltage at every node and the current in every branch, all at once.
The reactions: a circuit breaker trips on overload or short circuit, an RCD on current leaking to earth, an impulse relay toggles on each pulse. Each unit has its own threshold within its curve, as in real life.
The instruments: they read that same circuit. That is why a loose terminal or damaged insulation shows up when you measure, even though nobody has “flagged” it.
Every action re-runs the calculation: change a conductor or plug in an appliance and the result changes at once.
A fault is not a label or a script: it is a change in the circuit. A broken conductor, extra resistance in a contact, a path to earth through damaged insulation, an appliance that does not behave as it should.
The symptom — a light that will not come on, an RCD that trips, a voltage that drops under load — comes from the same calculation as in a healthy installation. That is why:
faults are found by measuring, with the same instruments and the same method as on site;
they are repaired with real actions, and the repair is checked like the installation itself;
a badly taken measurement shows: the instrument responds to what is there, not to what you expect.
When a scenario is created, the generator checks that every fault is noticeable and that the scenario can be solved. General fault types are listed in the Reference; concrete symptoms are part of the exercise.
When you finish, Voltaula checks the installation as it ends up, not the steps taken. Each rule refers to an REBT instruction or to good installation practice, and each violation has a severity: minor, serious or very serious.
The score combines two things:
how much of the task works: the objectives in the brief that are actually met in the computed circuit;
how it was done: each violation deducts according to its severity.
An installation that does not work cannot pass with a penalty: all objectives must be met. In exam mode, some critical violations mean the attempt cannot pass. The student can explain why something was done differently, and the teacher decides whether to accept it.
A scenario is the starting installation, the brief, the objectives and, if any, the faults.
Generated: built from a number (the seed). The same seed gives the same scenario, so a whole group can get exactly the same task, or each student their own.
Levels: decide how much is already installed, how many faults there are and how much help remains.
Checking: before handing it out, the generator builds the reference solution and checks that it meets the objectives, that every fault is noticeable and that no accidental violations are left.
Builder: the teacher draws their own plan or board, installs whatever they want, adds faults and writes the brief. It is published as a fixed version and assigned to a group.
Your AI: it can also prepare drafts in the builder; the teacher reviews and publishes them.
Voltaula comes in two editions with the same simulator: Study, for schools, and Work, for electricians. The edition is decided by the address you sign in at.
Study has three roles:
School owner: invites teachers, sees the whole school and decides whether an AI may be connected.
Teacher: creates groups, invites students or gives them a group code, assigns tasks, runs live sessions and reviews every attempt.
Student: does the tasks, sees their attempts and reports and can explain their decisions.
There is no open sign-up: access is given by whoever invites you.
Voltaula keeps only what is needed to practise and to review the work:
the account: email, name and, if you use one, an encrypted password;
attempts: every action, the report and the explanations;
the messages you send us from the app or the website.
Every user can download their data from their profile. In Study, the school decides how long attempts are kept, and a student's data can be deleted completely. We do not sell data or use it for advertising. Details are in the privacy policy.
The connection to your AI is a thin layer over the scenario builder, only in Study and only for teachers.
The AI signs in with your account and only with the permissions you tick when connecting it; you can withdraw them at any time, and the school owner can switch the connection off for the whole school.
It reads the catalogue, fault types and rules; creates and edits your drafts; assigns published scenarios to your groups only if you allow it.
It has no functions to see students, attempts, scores or chat.
Everything it creates goes through the same checks as the builder, and you publish it.
Every call is logged and the number of calls per minute is limited.
Voltaula is a training simulator: it does not replace the design or inspection of an installation by an authorised professional.
It is not a design or calculation tool for real installations, and it does not replace workshop practice or the official regulations. It is for preparing, practising and revising without using up material and without live voltage.
Values, rules and material, generated from the simulator itself.
Points = share of the task objectives met (0–100) minus a penalty for each violation:
Minor: −3 points
Serious: −10 points
Very serious: −25 points
An attempt passes when all objectives are met and at least 50 points remain. In exam mode a critical violation means the attempt cannot pass. The teacher can accept the student's explanation: that violation then stops counting.
This is how each check appears in the report; “…” is the value taken from the student's installation.
ITC-BT-25
Dwellings: number and type of circuits by electrification level; each circuit with its own circuit breaker, section and conduit per Table 1; one 30 mA RCD for at most five circuits.
C1 (lighting): circuit breaker of … A; the maximum is 10 A. — serious
C1 (lighting): cross-section … mm²; the minimum is 1.5 mm². — serious
C1 (lighting): … points; the maximum is 30. — minor
C1 (lighting): conduit Ø… mm; the minimum is Ø16 mm. — minor
C2 (general-use sockets): circuit breaker of … A; the maximum is 16 A. — serious
C2 (general-use sockets): cross-section … mm²; the minimum is 2.5 mm². — serious
C2 (general-use sockets): … points; the maximum is 20. — minor
C2 (general-use sockets): conduit Ø… mm; the minimum is Ø20 mm. — minor
C3 (cooker and oven): circuit breaker of … A; the maximum is 25 A. — serious
C3 (cooker and oven): cross-section … mm²; the minimum is 6 mm². — serious
C3 (cooker and oven): … points; the maximum is 2. — minor
C3 (cooker and oven): conduit Ø… mm; the minimum is Ø25 mm. — minor
C4 (washing machine, dishwasher and water heater): circuit breaker of … A; the maximum is 20 A. — serious
C4 (washing machine, dishwasher and water heater): cross-section … mm²; the minimum is 4 mm². — serious
C4 (washing machine, dishwasher and water heater): … points; the maximum is 3. — minor
C4 (washing machine, dishwasher and water heater): conduit Ø… mm; the minimum is Ø20 mm. — minor
C5 (bathroom and kitchen sockets): circuit breaker of … A; the maximum is 16 A. — serious
C5 (bathroom and kitchen sockets): cross-section … mm²; the minimum is 2.5 mm². — serious
C5 (bathroom and kitchen sockets): … points; the maximum is 6. — minor
C5 (bathroom and kitchen sockets): conduit Ø… mm; the minimum is Ø20 mm. — minor
Points of different circuits (…) share one circuit breaker. — serious
The neutral of a point does not come from its own circuit breaker. — serious
Part of the circuit is fed bypassing its circuit breaker. — very serious
The circuit is not protected by an RCD. — very serious
The RCD has a sensitivity of … mA; 30 mA is required. — very serious
One RCD protects … circuits; the maximum is 5. — serious
IGA of … A; the minimum for basic electrification level is 25 A. — serious
Points without a circuit breaker: … — very serious
A socket outlet without earth contact was installed. — very serious
…: … A socket outlet; … A is required. — serious
ITC-BT-19
Interior installations, general requirements: conductor colours (blue neutral, green-yellow protective, brown/black/grey line), admissible current of conductors, switching of the line conductor.
A … A circuit breaker does not protect a … mm² wire (admissible current … A). — serious
The point has no protective conductor (PE) connected to earth. — very serious
The neutral is …; it must be blue. — serious
The protective conductor (PE) is …; it must be green-yellow. — very serious
A line (phase) conductor is …; brown, black or grey are allowed. — serious
Green-yellow is used for a conductor that is not protective (…). — very serious
Bare conductor outside the terminal: stripped too long. — minor
Loose terminal: poor contact, the connection heats up. — serious
The switch interrupts the neutral: with the light off, the lamp holder is live. — serious
ITC-BT-17
General and individual control and protection devices: an IGA at the origin of the installation; an RCD must be protected against overcurrent by a device of equal or lower rating upstream.
The RCD (… A) is rated lower than the upstream IGA (… A). — serious
There is no main circuit breaker (IGA) at the origin of the installation. — very serious
Part of the installation is fed bypassing the IGA. — very serious
ITC-BT-18
Earthing: the protective conductors of all points meet at the main earthing terminal, which is connected to the earth electrode.
The main earthing terminal is not connected to earth. — very serious
RD 614/2001
Electrical risk at work. Five golden rules: disconnect, prevent reconnection (lockout), verify the absence of voltage, earth and short-circuit, mark off the work area.
Work on a live part (…): … mA through the body. — very serious · critical: in exam mode the attempt does not pass
Work without locking out the supply. — serious
Work without verifying the absence of voltage. — serious
ITC-BT-24 / UNE-EN 61008
Protection against indirect contact: the RCD must trip at its rated residual current (UNE-EN 61008); checked with the “T” button and a tester.
The RCD doesn't trip at its rated residual current — it's faulty. — very serious
ITC-BT-21
Conduits and trunking: how many conductors fit a conduit of each diameter (tables for surface and embedded runs, otherwise inner area ×2.5 / ×3 of the occupied area); joints only in boxes.
Wires joined inside the back box … — joints belong in a junction box. — minor
Conduit Ø… mm is too small for … wires: at least Ø… mm is needed. — serious
ITC-BT-27
Bathrooms and showers: zones 0–3 around the bath or shower; ordinary sockets and switches are not allowed in zones 0–2, sockets in zone 3 need a 30 mA RCD; supplementary bonding.
Socket or switch in bathroom zone … (…) — not allowed there. — very serious
Luminaire in a bathroom zone (…) needs at least IPX4 — serious
ITC-BT-52
Circuit … feeding an EV charger needs a 30 mA type A (or B) RCD — serious
ITC-BT-23
SPD … not earthed: the surge has nowhere to go, it does not protect — serious
Mounting box: Back box Ø68 mm, deep wall box 60 mm
Enclosures: Flush consumer unit enclosure 2×12, Surface consumer unit enclosure 1×12, Surface consumer unit enclosure 1×8, Surface consumer unit enclosure 2×12, Surface consumer unit enclosure 3×12 · Manufacturers and series: ABB Mistral41W, Legrand Practibox S, Schneider Electric Mini Pragma
Frame and device must be from the same series and have the same number of gangs.
In every series: Schuko socket 16 A with IP44 lid, Schuko socket 16 A with USB, doorbell push-button, intermediate switch, one-way switch, push-button, roller-shutter switch, rotary dimmer (LED), rotary dimmer for incandescent lamps (R), socket outlet 16 A 2P (no earth), socket outlet 16 A 2P+E, two-way switch
Niessen Zenit: also: cable outlet with terminal strip, doorbell buzzer, illuminated switch, motion detector, room thermostat (underfloor heating, radiator), socket outlet 25 A 2P+E · frames for 1–4 gangs · finishes: white, anthracite, silver, champagne · dimensions from the datasheet
Simon 27 Play: frames for 1–4 gangs · finishes: white, ivory, aluminium, anthracite · approximate dimensions
Simon 82 Concept: frames for 1–4 gangs · finishes: white, aluminium, anthracite, champagne · approximate dimensions
Schneider New Unica: frames for 1–4 gangs · finishes: white, anthracite, aluminium, black · dimensions from the datasheet
Not tied to a series: E27 holder + 9 W LED bulb, E27 holder + 9 W dimmable LED, LED ceiling light 18 W, LED downlight 7 W with driver, IP44, bathroom ceiling light LED 12 W, IP44, light point with 60 W lamp, smart relay for wall box, 2 channels (Wi-Fi), tubular roller-shutter motor 20 N·m (window)