# The part of the installation that leaves no margin for error > Source: https://wchampion.pt/en/infraestrutura-electrica ยท updated 2026-10-09 Electrical Infrastructure Networks, transformer substations and grid connection. This is the highest-risk part of our work, and therefore the one with the strictest rules on training, equipment and signage. [Request a quote](https://wchampion.pt/contacto.html?servico=infraestrutura-electrica)[Projects](https://wchampion.pt/projectos.html) Specific training Medium-voltage work carried out by personnel with appropriate, documented training Certified workwear Arc flash protection to EN IEC 61482-2 and EN ISO 11612 25 years Warranty on panels 10 years Warranty on inverters 22% Minimum efficiency 60% Max. climate control saving The risk ## The discipline where a mistake allows no second attempt Medium voltage has its own rules, distinct from those of low voltage: a different training regime, different protective equipment and different signage, all set out in law. The team entering a transformer substation has specific training and wears certified arc-flash workwear, category III PPE. Medium voltage with our own team This part is not subcontracted. The people who build the transformer substation and run the tests are ours, and they are the ones who answer if something fails at commissioning. What goes underground stops being visible Cable, cable route and depth are photographed with a positional reference before the trench closes. After that, checking means digging. The connection depends on third parties This is the phase where schedules slip, because it does not depend on us alone. We report dates once confirmed, and name what is at risk while there is still time to react. III PPE category Electrical Infrastructure ## What is guaranteed in writing ### Specific training Medium-voltage work carried out by personnel with appropriate, documented training. ### Certified workwear Arc flash protection to EN IEC 61482-2 and EN ISO 11612. 25 years warranty ### Standardised signage Danger-of-death warning and restricted access, in accordance with the regulation in force. 22% minimum efficiency ### Documented testing Measurements and tests delivered as a report before commissioning. Solutions ## Works at every point of the network Solution 01 ### Transformer substation Installation, standard signage and testing before commissioning. See detail โ†’ Solution 02 ### Buried network Trenching, cabling and cable routes, photographed before backfilling. See detail โ†’ Solution 03 ### Grid connection Coordination with the network operator until the connection is live. See detail โ†’ In detail ## What sits behind each one 01 ### Transformer substation We work in medium voltage with our own team, without subcontracting. Installation, standard signage and testing are completed before commissioning, because afterwards there is no margin left to discover what was missed. - Our own team qualified for medium-voltage work - Standardised signage and lock-out procedures documented - Testing completed before commissioning, not after 02 ### Buried network What goes underground can no longer be inspected. Cabling, cable routes and depths are therefore photographed before the trench is closed, and the layout is handed over as a drawing to whoever has to intervene later. - Photographic record with positional reference before backfilling - Depths and separations in accordance with the applicable standard to the network type - Layout handed over as a drawing, still usable years later 03 ### Grid connection The connection depends on third parties, and it is where schedules usually slip. We handle the process with the network operator and report dates as they are confirmed, not as they are hoped for. - Process handled with the network operator through to live connection - Test documentation prepared for inspection - Dates reported once confirmed, with anything at risk named ## From first contact to documented handover 01 Electrical design Load, protection and routing calculations, with drawings and specifications. 02 Approval Coordination with the network operator and with the energy authority where applicable. 03 Delivery Trenching, cabling, switchboards and transformer substation, recorded by phase. 04 Testing Earthing, insulation and continuity measurement, with signed report. 05 Commissioning Connection, safety signage on doors and handover of documentation. The calculation is written down before the first team reaches the site Delivered works ## Installations that demonstrate our capability Transformer substation: switchgear, busbars and cable trays Cable trenches open to the connection point Cables laid with spacing and a sand bed Ground prepared ahead of the electrical installation ## Questions that deserve a direct answer Do you work on medium voltage? Yes, with specifically trained personnel and certified arc-flash protective workwear to EN IEC 61482-2. Who is the operator of record? Not always WChampion. On a turnkey project the owner of the installation becomes the operator, and the door sign says so. What signage is mandatory on a transformer substation? A danger-of-death warning on the door, the door locked, and access restricted to suitably trained personnel. Do you handle grid connection? Yes, in coordination with the network operator. The timescale for that connection depends on the operator, not on the works, and is indicated in the proposal. Request a quote ## For projects that demand a proper standard. Tell us what you need. We reply with a written technical proposal. [Request a quote](https://wchampion.pt/contacto.html?servico=infraestrutura-electrica) [Talk to us](tel:+351263948197)