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Balfour Interserve: Mayflower WTW

Balfour Interserve for South West Water: Mayflower WTW

Customer Scope

Construction of a new 90 MLD Water Treatment Works at Roborough in Plymouth. 

GPS Scope:

Design manufacture test and systems integration of all LV process and power elements.

  • Duration 36 weeks
  • Industry Sector Regulated Water
  • Contract Circa £500,000
  • Completion August 2017
  • Mayflower WTW
  • Mayflower WTW
  • Mayflower WTW

Mayflower WTW.


Project Delivery / Outcome

GPS provided more than 45 metres of LV assemblies based on its G-Flex modular design, including four MCCs serving raw water, chlorine, treated water and waste processes using TeSys U advanced contoller motor starters, plus three LV distribution panels up to 80kA. 

Standard designs and pre-engineered enclosures delivered time and cost savings, contributing to aggregate savings which saw the overall project completed under budget.


  • Design: G-Flex Modular, with front access, top cable entry  
  • MCC Metres: 49 m 
  • Separation: Form 4
  • IP rating: 54
  • Current rating(s): From 460A to 3300A 
  • Fault rating(s): From 20kA/1SEC to 80kA/1SEC 
  • PLC system: Schneider HMISCU combined PLC HMI units
  • Communications: CAN and Ethernet


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