OCA low-voltage inspection: what is checked and when it is due

An accredited control body, the OCA, and not the company that installed or maintains the installation. If defects are found, an authorised installer corrects them.

Industrial installations that needed a project and exceed 100 kW installed, places of public assembly, class I fire or explosion risk premises, wet locations above 25 kW, swimming pools above 10 kW, operating theatres, outdoor lighting above 5 kW and electric vehicle charging stations that needed a project.

Every 5 years for all those that passed the initial inspection. Every 10 years for the common areas of residential buildings above 100 kW. This is the general rule of the regulation.

They are very serious, serious or minor. With no very serious or serious defects, the certificate is favourable. With a serious defect, or a minor defect from a previous inspection left uncorrected, it is conditional and a deadline is given to correct it. If the deadline passes without correction, or there is a very serious defect, the result is negative and is reported to the authority.

Keep the design, the diagrams and the installation certificates to hand. Before the visit, measure earthing and insulation and look at the boards with thermography. That is what we do in well-run preventive maintenance.