Electrical project and technical design report (MTD) in Seville, Spain

Electrical project in Seville, Spain or design report: which document you need

Every new, extended or renovated electrical installation in Spain has to be documented before it is switched on. If you come from the UK, think of it as the paperwork your electrician and building control would deal with there, except that here it is registered with the regional government, the Junta de Andalucía. The Spanish Low Voltage Electrotechnical Regulation (REBT, Royal Decree 842/2002) sets two routes in its ITC-BT-04:

• Technical design report (memoria técnica de diseño, MTD). The simple document, on the official Junta de Andalucía form (a model published in the BOJA, the regional official gazette, in 2015), drafted by the installer company itself. It covers homes, renovations, extensions and most EV chargers.
• Electrical project (proyecto eléctrico). A full document with calculations, drawings, a single-line diagram, specifications and a budget, signed by a qualified technician. ITC-BT-04 requires it when the installation exceeds certain power thresholds or has a higher-risk use.

Choosing the right document at the start saves a lot of trouble. If you buy the equipment or open the shop and it then turns out a project was needed, the paperwork has to be redone, and sometimes part of the work too.

When an electrical project is compulsory

These are the cases we see most often in Seville and its metropolitan area:

• Shops, bars and warehouses above a certain power or with certain uses: ITC-BT-04 sets the threshold by activity, and premises open to the public (pública concurrencia) also have an initial inspection by an authorised inspection body under ITC-BT-05.
• Solar installations over 10 kW, typical of a warehouse or a company roof.
• EV charging over 50 kW, or outdoor charging over 10 kW: car parks, fleets and industrial estates.
• Industrial warehouses with their own supply connection, power sockets and machinery.

Below those cases the design report is enough. In a flat in Nervión being rewired, a kitchen renovation in Triana or a 7.4 kW charger in a garage in Dos Hermanas, the right document is the electrical certificate (boletín) with its MTD.

What a technical design report includes

• Details of the owner, the location and the use of the installation.
• Expected power and level of electrification.
• The individual supply cable from the meter (derivación individual) and the circuits, with their cable sizes.
• Protections: main switch, RCDs, circuit breakers and surge protector.
• Earthing (grounding in the US).
• Single-line diagram and, where needed, drawings.

Typical cases in Seville

• A bar or shop opening in the historic centre or in Nervión. It counts as premises open to the public: we check whether its power requires a project, coordinate the engineer and prepare the electrical paperwork for the business opening licence.
• A warehouse on an industrial estate in Alcalá de Guadaíra or Dos Hermanas that wants panels on the roof. Over 10 kW it needs a project, which we coordinate with solar for businesses.
• An old installation with no paperwork, in a villa in the Aljarafe or an inherited shop. The solution is to legalise it with the report or project that applies. If you are still buying, an electrical survey before buying tells you in advance what you are taking on.

How we work

1. You tell us what you plan to do: use, power, floor area and expected equipment. Photos and drawings help.
2. We tell you which document you need and whether there will be an inspection by an authorised inspection body (OCA).
3. We draft the report, or coordinate the engineer who signs the project, with calculations matched to the real job.
4. We carry out the installation exactly as documented.
5. We issue the certificate and register it with the Junta de Andalucía, so the distributor can connect the supply or increase the power.

Guide prices in Seville

We give you a fixed price once we know which document applies and what needs upgrading. More jobs in this family under electrical installations, and our general rates on the prices page.