C&G 2357 605 / 17th Edition Exam


The second GOLA exam that appears in the 2357 qualification is the 605 which brings in the underpinning knowledge for the installation side of the qualification. Although this exam is open book, there is a large area to cover from installation techniques through to using BS7671 to identify specific regulations.

Exam Breakdown

The exam is a 15 question multiple choice online exam broken down into several different sections with a 30 minute time limit. There is also the opportunity for learners to undertake the full 17th Edition Exam as an alternative.

Category Number of Questions
Protection against electric shock 3
Protection against fire/flammable/explosive atmospheres 2
Selection and erection of wiring systems, associated equipment and enclosures 4
Isolation and switching 2
Special locations 4

Revision List

The following items should form the mainstay of your revision time:

  • Disconnection times
  • Use of RCDs
  • Loop impedance and values
  • Socket outlet and final circuit arrangements
  • Basic and fault protection
  • Isolation and switching
  • Special locations
  • Protection against fire
  • Protection against electric shock
  • Circuit protection
  • Single and three phase installations
  • Appendices
  • Regulations and codes of practise
  • Wiring systems
  • Access equipment
  • Containment systems
  • Environmental considerations
  • Hand and power tools
  • Fixing devices
  • Restoring building fabric
  • Safe isolation procedures
  • Safe systems of work
  • Checking for pre-existing damage


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