Tender: Survey & RIBA 4 Design for Tunnel Ventilation Fan Drives, VSDs and Low-Voltage Switchgear Replacement – CTA, Terminal 4 & Sipson Farm

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Expression of Interest: MEP subcontractor needed to carry out survey and RIBA 4 design to replace end-of-life tunnel ventilation components at Central Terminal Area (CTA) North and South, Terminal 4 North and South, and Sipson Farm. The scope includes replacement of components for 8 existing Variable Speed Drives (VSDs) and their panel, replacement of 5 Direct-On-Line (DOL) starters with VSDs and associated panels, connection of the VSDs to the Tunnel Control System (TCS), replacement of incoming Air Circuit Breakers (ACBs) and low-voltage protection devices (MCCB/MCBs) which may require full LV switchgear and DOL panel replacement where impacts are significant, installation of energy-efficient LED luminaires, provision of 240V socket outlet assemblies near damper units, and replacement of existing junction boxes and cable termination boxes. Surveys of the five ventilation buildings must be carried out during non-operational hours to provide the information required to complete the RIBA 4 design; RIBA 5 onwards (including construction) is excluded.