MECH3422 Building Services Engineering I

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Electrical Services Systems – Regulations, Electrical Protection, Standby Power and Testing

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1. Regulations

2. Electrical Protection

3. Earthing Arrangements

4. Backup of Normal Supply

5. Standby Generator

6. Testing of L.V. Systems

[Download powerpoint file]

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Video Presentation:

• Electricity : Information for the Electrical Trade http://www.emsd.gov.hk/emsd/eng/pps/electricity_trade_video.shtml
• Video for Electrical Workers 2 – 8 Step for Periodic Inspection, Testing and Certification Work (28:11) http://youtu.be/a4ysLGVFGBM

Further Reading:

• Atkinson, B., et al., 2013. Electrical Installation Designs, 4th ed., John Wiley & Sons, Chichester, West Sussex and Hoboken. [Wiley online library]
• Chapter 4 Overcurrent Protection
• Chapter 7 Earthing and Bonding
• Chapter 14 Cables and Wiring Systems
• Chapter 17 Residual Current Devices
• Chapter 19 Circuit Design Calculations
  
• EMSD, 2009. Code of Practice for the Electricity (Wiring) Regulations, Electrical & Mechanical Services Department (EMSD), 2009 Edition, the Government of the Hong Kong Special Administrative Region, Hong Kong. [HK 621.31924 H77] [PDF]
• Code 2 Interpretation
• Code 7 Current Demand
• Code 9 Overcurrent Protective Devices
• Code 11 Earth Leakage and Earth Fault Currents
• Code 12 Earthing Arrangement
• Code 19 First Inspection, Testing and Certification
• Code 20 Periodic Inspection, Testing and Certification
• Code 21 Procedures for Inspection, Testing and Certification
• Circuit Protection Principle (hager) [PDF]
• Automatic Disconnection of Supply (incorporating earthed equipotential bonding) [PDF]
• Periodic Test for Fixed Electrical Installations http://www.emsd.gov.hk/emsd/eng/pps/electricity_feipt.shtml
• Guideline for Periodic Inspection, Testing and Certification (PITC) Work [PDF] http://www.emsd.gov.hk/emsd/eng/pps/electricity_pitc_work.shtml
  
• Sample Schedule of Test Results for Electrical Wiring [PDF]
  
• Example of a Periodic Test Certificate (Form WR2) [PDF]
  

References:

• ArchSD, 2012. Testing and Commissioning Procedure for Electrical Installation in Government Buildings of The Hong Kong Special Administrative Region, 2012 Edition, Architectural Services Department (ArchSD), the Government Buildings of the Hong Kong Special Administrative Region, Hong Kong. [PDF]
• BS 7671:2008 Requirements for Electrical Installations (IET Wiring Regulations 17th Edition) [PDF]
• Coates, M. and Jenkins, B., 2010. Electrical Installation Calculations: for Compliance with BS 7671 : 2008, 4th ed., Wiley-Blackwell, New York. [621.31924 J521 e38][Wiley online library]
• Hall, F. and Greeno, R., 2011. Building Services Handbook, 6th ed., Part 11, Elsevier, Oxford. [690 H17][ebook via ebrary]
• Hastings, P., 2005. The Illustrated Guide to Electrical Building Services, 2nd ed., Building Services Research and Information Association, Bracknell, Berkshire, England. [621.3 D27]
• HEC, 2010. Guide to Connection of Supply, Hongkong Electric Co., Ltd. (HEC), Hong Kong. (available from http://www.hec.com.hk/)
• Linsley, T., 2011. Basic Electrical Installation Work, 6th ed., Taylor & Francis Ltd., Hoboken. [ebook via Ebook library][companion website]
• Chapter 4 Electrical supply systems, earthing arrangements and protective devices
• Chapter 7 Inspection, testing and commissioning electrical installations
• Scaddan, B., 2011. Electrical Installation Work, 7th ed., Taylor & Francis Ltd., Hoboken. [Ebook library]
• Chapter 16 Earthing and Bonding
  
• Wong, Chun-fai, Johnny, 2004. Low Voltage Electrical Installation Handbook, Rev. [ed.], H.K. & Kowloon Electrical Engineering & Appliances Trade Workers Union, Hong Kong. [621.31924 W87]

Web Links:

• Building Electrical Services (LSBU) e-learning material http://www.blc.lsbu.ac.uk/eservices/DocHme.html
• Module 1: Terminology
• Module 2: Basic Theory and Supply
• Module 3: Electrical Distribution
• Module 4: Cable Sizing
• Module 5: Testing
• EMSD Electricity Legislation Division http://www.emsd.gov.hk/emsd/eng/pps/electricity.shtml
• Earthing schemes http://www.electrical-installation.org/enwiki/Earthing_schemes
  
• Earthing system -- Wikipedia http://en.wikipedia.org/wiki/Earthing_system
  
• Earthing Systems http://www.arca53.dsl.pipex.com/index_files/elect4.htm
• Faraday cage - Wikipedia http://en.wikipedia.org/wiki/Faraday_cage
  
• Focus Article: Verification of Extraneous Conductive Parts [Electricity News, First Issue (September 2002)] http://www.emsd.gov.hk/emsd/eng/pps/pub_gng_elenews.shtml
• Feature Article 4 - When is "Supplementary Bonding" Required? [Electricity News,  22th Issue - May 2013] http://www.emsd.gov.hk/emsd/eng/pps/electricity_new_22.shtml#bm2d
• Select Cables of Suitable Sizes [Electricity News, 8th Issue - April 2006] http://www.emsd.gov.hk/emsd/eng/pps/electricity_new_8.shtml#bm4
  
• Checklists on Items for Inspection and Testing of Low-voltage Electrical Installations [EMSD] (PDF)

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| Created: Aug 2015 | Update: 29 Oct 2015 | By: cmhui@hku.hk |