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Electrical Services Explained - 3 Days

Key areas
Course content
Learning Outcomes
Course timings
Course fees
Upcoming courses

Key Areas

  • Legislation & guidance
  • Basic electrical principles
  • HV & LV Electricity generation,
  • High voltage distribution and switchgear,
  • Transformers and substation design
  • Low voltage distribution and switchgear
  • Alternative and standby power supplies (generators and UPS)
  • Dangers of electricity and physiological effects of electric shock
  • Explanation of short circuits and fault currents
  • Protective systems using fuses and circuit breakers
  • Lighting & lamps with simple design calculations
  • Wiring systems and final circuits, differences between the ring and radial final circuits
  • Examples of cable sizing calculations
  • Overview of BS7671 Wiring Regs and Electricity At Work Regulations
  • Inspection and testing and certification to BS7671 IEE Wiring regulations and EAWR
  • Periodic inspection and testing of existing installations and Portable Appliance Testing
  • Certification and reporting

Course Content

This three day course will give you grounding in electrical services and equipment and a better appreciation of many of the issues associated with design, installation and maintenance of electrical systems. Delegates will develop their own engineering judgments and confidence when dealing with electrical issues.

Day 1 - Supplies, Switchgear & Safety

Session 1

  • Introduction
  • Power Supplies
  • Electricity supplies at high & low voltage, maximum demand, substations, transformers, metering

Session 2

  • Generators & Uninterruptible Supplies
  • Use of generators & uninterruptible power supply systems (UPS)

Session 3

  • Distribution Switchgear & Protection
  • How main and sub-main circuits are determined, arranged and protected

Session 4

  • Fuses & Circuit Breakers
  • Selection & use for equipment protection
  • Overview of short circuits, earth faults & discrimination between devices.


Day 2 - Systems, Circuits & Cables

Session 1

  • Lighting Systems & Control
  • Different lighting & lamp types
  • Electrical supplies and switching arrangements

Session 2

  • Power Circuits
  • Ring mains and radial circuits, their uses & application
  • Motors, starters & overloads

Session 3

  • Wiring Systems & Containment
  • Matching wiring systems to the building
  • Merits & selection of current wiring practices
  • Cabling for fire & emergency lighting systems

Session 4

  • Conductors and Cables
  • What influences the sizing of conductors to ensure safety and reliability
  • Simple cable sizing


Day 3 - Inspection, Testing and Certificates

Session 1

  • Regulations
  • Overview of the Electricity at Work Regulations and the IEE Wiring Regulations - BS 7671

Session 2

  • Inspection and Testing (I&T)

Session 3

  • Certification, Reporting
  • Portable Appliance (PAT) Testing

Session 4

  • Course Summary
  • A case study of the design and installation of a small electrical installation

Learning Outcomes

  • Understanding of simple theory applied to design calculations
  • Understand the differences between high and low voltage systems and equipment
  • Awareness of substation layout of equipment
  • Appreciate the electrical plant and equipment used in main, sub main and final distribution and circuits
  • Knowledge of electric shock and the need for continued electrical safety
  • Appraisal of different type of circuit protection (fuses or circuit breakers)
  • Through simple calculation, understand the basics of lighting design
  • Appreciate the different type of wiring systems available and how to select the best system with regard to installation, maintenance and cost considerations
  • Understand the various factors applied to correct cable sizing
  • Gain an appreciation of BS7671 IEE Wiring Regulations and Electricity at Work Regulations
  • Understand the need for initial and periodic inspection and testing and PAT testing for continuing safety of electrical systems
  • Understand the role of the electrical designer, installer and tester in an electrical installation and their responsibilities concerning certification and reporting

Course timings

Registration and coffee will be at 09.00.
The course will start at 09.30 and finish at 17.00 each day


Members Rate: £1,308 (£1,090 ex VAT)

Standard Rate: £1,458 (£1,215 ex VAT)

Upcoming courses

17th - 19th April 2018 | London - Electrical Services Explained - A1601

15th - 17th May 2018 | Manchester - Electrical Services Explained - B359

27th - 29th June 2018 | London - Electrical Services Explained  - A1626

18th - 20th July 2018 | Manchester - Electrical Services Explained - B365

9th - 11th October 2018 | London - Electrical Services Explained - A1655

27th - 29th November 2018 | Manchester - Electrical Services Explained - B370

In-house training at your site

Training multiple staff at once is the most cost effective way to develop staff for organisations. All our courses can be delivered at your site (min 6 staff) at discounted rates. These In-House courses are only available in the UK and Europe. For an In-house quote please email; 
Name of course, approximate number of staff and your site address 


To contact the CIBSE Training Team with a query please

Email: or call: +44 (0)20 8772 3637