There was very little planning of wiring installations in those early days, but now, with supplies from the grid, very large sources of power are introduced into all premises which use electricity, and proper planning and design have become essential. Like fire, electricity is a very good servant, but if not properly controlled and used it can prove to be a very dangerous master. The need for planned methods of wiring and installation work has long been recognized and all kinds of regulations, requirements, recommendations, codes of practice, and so on have been issued. Some are mandatory and can be enforced by law, whilst others are merely recommendations. A Designer of electrical installation and subsequently the maintenance team are all expected to provide and ensure that an electrical installation is safe, cost-effective, and reliable throughout its lifetime. As a result of many years developing and teaching courses devoted to compliance with the IEE Wiring Regulations for low voltage installations up to 750V & IEC 60364 as well, it has become apparent to me that many operatives and personnel in the electrical contracting industry have forgotten the basic principles and concepts upon which electric power supply and its use are based. As a result of this, misconceived ideas and much confusion have arisen over the interpretation of the Regulations. It is the intention of this course to dispel such misconceptions and to educate and where necessary refresh the memory of the trainee. In this respect, the emphasis has been placed on those areas where most confusion arises, namely earthing and bonding, protection, and circuit design. 

At the end of this course, participants will learn about:

  • The latest requirements of the IEE Regulations and the required Electrical Design concepts
  • Working within an environment controlled by IEE Regulations
  • The basis for safety and functional design
  • Inspection and testing techniques that affect the maintenance routine of an installation

Fundamental Requirements for Safety & Basics

Review of Electrical Fundamentals

Earthing & Bonding.

  • Earth: what it is, and why and how we connect to it.
  • Earthing systems & Earth electrodes.
  • System classification & Requirements  (TN system, TN-C system, TN-S system,  TN-C-S system, TT system & IT system).
  • Earth fault loop impedance.
  • Residual current devices.
  • Supplementary bonding.
  • Earthing conductors
  • Earthing arrangement selection.

Protection& Shock

  • What is protection?
  • Protection against mechanical damage.
  • Protection against electric shock.
  • Protection against overcurrent.
  • Protection against undervoltage.
  • Protection against overvoltage.
  • Protection against fire.

Control

  • Isolation and switching.

Circuit design

  • Design procedure.
  • Design current.
  • Nominal setting of protection.
  • Correction factors.
  • Tabulated current-carrying capacity.
  • Choice of cable size.
  • Voltage drop.
  • Shock risk.
  • Thermal constraints.
  • Example of circuit design.
  • Design problem.

Conduit Installations & Raceways

Testing and inspection

  • Testing sequence.
  • Continuity of protective conductors.
  • Continuity of ring final circuit conductors.
  • Insulation resistance.
  • Polarity.
  • Earth electrode resistance.
  • Earth fault loop impedance.
  • Prospective fault current
  • Functional testing.

BS7671 2004/2008, the Changes

IEC 60364-XX

Safety in electrical testing

Discussion’s and Summary

Electrical Managers, Electrical Supervisors, Electricians, and personnel involved in the design of Electrical Systems with at least two years' experience in the electrical power industry.

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