OL04 - Low voltage distribution

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Who should study this unit?

The module is designed for non-electrical Building Services engineers who now find that they have an increasing need to be able to design electrical distribution schemes, or for those with a more traditional electrical background who wish to apply their knowledge practically to the design of electrical distribution within buildings.

The module covers both the principles and practices of electrical power distribution from the optimum location for the main electrical intake position through to the choice of power distribution systems and their containment. It also introduces the use of essential and non-essential supplies and the possible choices for standby electrical supplies.

Learning outcomes:
Upon completion of the module, students should be able to:

• Make suitable load assessments for buildings to enable supply application including the maximum demand requirement
• Consider the effect of: usage and occupancy, daylight availability and other building services such as air-conditioning on a building's electrical power requirements
• Utilise rules of thumb and diversity tables in the estimation of load factor
• Make initial decisions with regards the main electrical intake locations, such as:
  (i) Intake location
  (ii) Use of high-voltage vs. low voltage supplies
  (iii) Access and metering requirements
• Make initial decisions with regards to the distribution of electrical supplies within a building including the choice of system, its protection and its containment
• Appreciate the factors which affect the choice of cables and their installed current ratings
• Consider which supplies are essential and which non-essential and possible forms of standby/emergency supply.

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