Medium and High-Voltage Electrical Services
All around medium and high-voltage expertise for your critical infrastructure
For your high-power distribution projects, Entreprise Électrique MJL acts as your single point of responsibility. In close partnership with the specialists at Ligne STE, we provide complete management of the design, installation, and maintenance of your private networks throughout Quebec.
Our teams have the skills, accreditations, and equipment required to ensure safe, compliant, and durable interventions, even in the most demanding environments.
Solid expertise for your high-power electrical networks
Medium and high-voltage networks are at the heart of industrial, municipal, and institutional infrastructure.
Supported by the MJL Systèmes Automation and Ligne STE divisions, our team has the skills, accreditations, and equipment required to ensure safe, compliant, and durable interventions, even in the most demanding environments.
Comprehensive medium and high-voltage services
Our technicians are trained to intervene across the entire lifecycle of your high-power electrical installations:
Construction of overhead and underground networks
We handle the complete deployment of your distribution infrastructure. This includes the construction of private electrical lines, pole installation for overhead networks, as well as excavation and installation of underground distribution systems. Our partner ensures a durable structure adapted to your site’s topography.
Electrical substations and power equipment
From procurement to energization, we manage the installation of your transformers (available for purchase or rental) and metering enclosures for accurate consumption readings. We also ensure the safe integration of all switching gear and substations required for your power supply.
Specialized connections and cable terminations
The reliability of your network depends on the quality of its connections. Our experts perform certified installation of medium-voltage cable terminations and complex terminations. These connections are executed with precision to ensure junction safety and prevent premature failure of critical equipment.
Maintenance, work at height, and emergency service
To ensure the longevity of your installations, we offer a comprehensive inspection and maintenance service, including the use of 55-foot bucket trucks for work at height. In the event of an outage, our 24/7 emergency service enables rapid intervention to diagnose, repair, and restore power—minimizing operational losses.
Installation et mise en service d’équipements moyenne et haute tension
Transformateurs, disjoncteurs, sectionneurs, appareillage de commutation, sous-stations et postes électriques.
Raccordement et terminaison de câbles de puissance
Assemblage, pose et test de têtes de câbles moyenne tension selon les standards de l’industrie (3M, Nexans, Raychem, etc.)
Inspection, entretien et essais diélectriques
Vérification des composantes, mesures d’isolation et tests de performance pour garantir la fiabilité et la sécurité de vos réseaux.
Remise aux normes et modernisation d’équipements existants
Mise à niveau d’infrastructures électriques selon les réglementations CSA et Hydro-Québec, pour prolonger la durée de vie de vos installations.
Diagnostic et maintenance préventive
Détection de défauts, entretien planifié, thermographie infrarouge et analyse d’onde électrique pour prévenir les pannes coûteuses.
Sécurité, conformité et fiabilité avant tout
Les travaux en moyenne et haute tension nécessitent une expertise pointue et une discipline rigoureuse.
Nos équipes appliquent des protocoles de sécurité stricts et utilisent des équipements certifiés afin d’assurer des interventions sans risque et conformes aux exigences du Code canadien de l’électricité.
Nous garantissons :
Des procédures normalisées et documentées
Des tests de continuité, de résistance et d’isolation systématiques
Une traçabilité complète des opérations et des rapports techniques
Une collaboration constante avec les ingénieurs et fournisseurs d’équipement
Chaque projet est planifié et exécuté pour assurer performance, fiabilité et durabilité des infrastructures électriques à long terme.
An alliance of experts for your critical infrastructure
Through close collaboration with its strategic partners, Entreprise Électrique MJL delivers a uniquely integrated expertise in Quebec.
This synergy allows us to provide a turnkey service, from the power source to the control system, with a high level of precision and safety.
Entreprise Électrique MJL
Project management, design, and installation of main electrical distribution systems.
MJL Systèmes Automation
Design and integration of control, instrumentation, and communication systems for energy management.
Ligne STE
Construction, connection, and critical maintenance of medium and high-voltage infrastructure (overhead and underground networks).
Do you have a medium or high-voltage electrical project?
Whether it’s a medium-voltage connection, the construction of an electrical substation, or the maintenance of high-voltage lines, Entreprise Électrique MJL provides comprehensive and responsive support. We work on your critical infrastructure in the industrial, municipal, and energy sectors, with an unwavering commitment to the safety and performance of your power distribution.