PBX Engineering provided detailed design, tender support, construction management, and contract administration services for the electrical upgrade and replacement of four Motor Control Centres (MCCs) and associated Programmable Logic Controller (PLC) systems at the Whistler Wastewater Treatment Plant (WWTP). Serving a world-class resort community, the facility operates as critical municipal infrastructure with continuous uptime requirements and stringent effluent discharge standards.

The project replaced end-of-life MCC and PLC hardware serving major treatment and solids-handling processes across the Primary Building, Sludge Handling Building, and Old Controls Building. PBX delivered complete electrical, instrumentation, and controls (EIC) engineering encompassing power distribution, grounding, cable routing, hazardous area classification, and full system integration. The communications architecture was modernized from DeviceNet to Ethernet/IP, improving system reliability, performance, and long-term maintainability.

The defining challenge was maintaining uninterrupted plant operations throughout construction. With no bypass capability and limited space for parallel installation, any loss of power or control carried significant environmental and community risk. PBX worked closely with RMOW operations staff, the construction contractor, and a third-party system integrator to develop detailed cutover, isolation, and contingency plans that enabled phased replacement while keeping all critical treatment processes continuously operational.

Through rigorous planning, collaborative execution, and commissioning leadership, PBX successfully modernized essential control infrastructure without interruption to plant operations, enhancing system resilience, reducing environmental risk, and protecting public health and the surrounding natural environment.

PBX’s approach was grounded in operational continuity, risk management, and close collaboration with plant staff. Early in design, PBX engaged directly with RMOW operations personnel to develop a detailed understanding of process dependencies, allowable downtime, and control requirements at the equipment level.

Comprehensive cutover and sequencing plans were prepared for each MCC and PLC replacement, defining outage allowances, manual versus automated control strategies, and contingency and rollback procedures. Severe space constraints required the new MCCs to be installed in the same locations as the existing equipment. To address this challenge, PBX implemented a staged replacement strategy using temporary power distribution, selective load transfers, and short, carefully coordinated outages.

PBX coordinated closely with the electrical contractor and a third-party system integrator and fulfilled a central commissioning leadership role. All systems were pre-commissioned prior to cutover to minimize risk during transition. When an unanticipated power event occurred during construction, established contingency measures were successfully implemented, preventing loss of containment or environmental impact.

This operations-driven approach enabled safe execution while maintaining continuous treatment performance.

Four MCCs and PLC systems were replaced without interruption to wastewater treatment operations. The project significantly improved system reliability, safety, and maintainability while reducing environmental risk. Through phased execution and collaborative delivery, the upgraded infrastructure now supports resilient, long-term operation of a critical municipal facility.