Assessment and applicable framework
Initial installation survey, review of designs, certificates and previous reports, confirmation of the applicable oversight regime and definition of critical points to monitor.
Operation of electrical installations
Responsible Engineer for Electrical Installations in Lisbon (TRE)
TRE services to supervise electrical installations, meet applicable requirements and support safe, documented and technically managed operation.
DGEG-recognised technicianPeriodic checksOperational report
Continuity, compliance and safety
TRE supervision during installation operation
The Técnico Responsável pela Exploração (TRE), the engineer responsible for operational supervision, oversees private electrical installations covered by the applicable regime. The service starts with an installation assessment and document review, followed by periodic checks, reporting of deficiencies and technical guidance for the operator.
Not all installations require a TRE: the requirement depends on installation type, location, installed capacity and use. We carry out an initial assessment to confirm the applicable framework and define supervision suited to the building and activity.
How the service helps
- Supervision by a qualified, recognised technician
- Identification and reporting of faults and risks
- Applicable checks, tests and measurements
- Organisation of maintenance and corrective actions
- Operational reports and technical records
Periodic checks
Where legally required, the TRE inspects the installation at least twice a year, once in summer and once in winter, carrying out the checks, tests and measurements needed for the operational report.
Operational report
Records of installation condition, supervised work, identified deficiencies and recommendations. The current official template is used and applicable procedures are handled through the channels defined by DGEG.
Support for the installation operator
Reporting of safety-related situations, guidance on corrections and maintenance, assessment of installation changes and technical coordination where inspections, incidents or significant modifications arise.
Method
From initial assessment to a supervision plan
We start by assessing the installation and reviewing existing documentation. We then define intervals, critical points, contacts and priority actions. Observations are reported clearly, distinguishing urgent corrections, planned maintenance and improvement opportunities.
View the official DGEG operational supervision framework
View the current operational report template
SwitchboardsProtectionEarthingMaintenanceRecords
Frequently asked questions
Before commissioning TRE services
Do all installations need a TRE?
No. The applicable regime depends on installation type, location, installed capacity, use and characteristics. This is confirmed after reviewing the technical information and applicable framework.
How many visits does the TRE make?
Where an installation is legally subject to TRE supervision, the legislation provides for inspections at least twice a year, once in summer and once in winter, for the relevant checks, tests and measurements and preparation of the operational report.
Which documents should we provide?
Available design or as-built drawings, electrical installation data sheet, operating certificate, previous reports, maintenance records and details of any alterations.
Does the TRE service replace electrical maintenance?
No. The TRE provides operational technical supervision and may recommend or coordinate work, but maintenance must be carried out by professionals or entities qualified for the work concerned.
How do you demonstrate the TRE's qualifications?
Evidence of the relevant recognition and registration is provided to the client during assessment and commissioning of the service.
Initial assessment
Does your installation need a TRE?
Send us the capacity, installation type, use and available documentation. We will confirm the applicable framework and next steps.