This 2-day course is open to anyone wishing to improve their 3-phase knowledge and testing skills. It is also aimed at students wishing to improve their 3-phase knowledge prior to taking the City and Guilds 2391.

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DAY 1 – Introduction to 3-phase supplies

Theory of 3-phase distribution

  • Generation
  • 6 wire – 3 wire
  • Phase relationship
  • Relationship between U and Uo
  • Voltage/current/power relationships

UK sub-station

  • Supply voltages
  • Relationship with earth
  • Line and Neutral

Cable core identification

  • Colour
  • Numbers
  • Letters

3-phase distribution boards

  • Isolation
  • Bus bar arrangement
  • Ferromagnetic effects
  • Circuit numbering

3-wire and 4 wire arrangements

  • Unbalanced loads
  • Balanced loads

Power Factor

Motors

  • Type B/C/D circuit breakers
  • Fuses
  • Overload calculations for wiring
  • Overload protection for motor
  • Star/Delta starting arrangements
  • DOL starting arrangements
  • Soft Starting arrangements

DAY 2 – Practical Applications

Testing 3-phase circuits and recording the results

  • Continuity
  • Insulation Resistance
  • Ze
  • PFC
  • RCD
  • Functional
  • Fault finding

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