Design, Inspection and Testing of Electrical Installations in Compliance with SS638 (Formerly CP5)


About This Course


In EMA’s circular to LEW dated 15 Nov 19, it stated that after a transition period of 12 months, from 15 November 2020 onwards, all new installations, replacements, upgrading or extensions of electrical installations and temporary electrical installations shall comply with relevant sections of the new SS 638, SS 650 Part 1 and Part 2.

This course will provide an overview of SS638 and discuss how it may impact the work and services of developers, consultants, site staff, contractors and LEWs under the Electricity (Amendment) Act 2018 which comes into operation on 3 May 2019. The SS650 Part 1 and Part 2 will be covered in another course together with the Transmission Code


The Electricity and Workplace Safety and Heath regulatory frameworks stipulate, inter alia, the need for electrical installations to comply with the SS638  requirements. Subject to the relevant provisions of the Act and Regulations under the respective regulatory framework, the Regulator can take the responsible party to task for non-compliance.

This short course is structured to introduce participants to the regulatory environment, the design principles, inspection and testing of electrical installations in customer premises, including the specific SS638 requirements pertaining to low voltage electrical installations.

The course is conducted through lectures and case studies to enable the participants to progress with the basic electrical installation design procedures, inspection and testing processes. Practical hands-on sessions are carried out in class to enhance the learning experience.


The participants will learn through this short course the regulatory frameworks in respect of electrical installations, roles and responsibilities of LEW and licensee of an electrical installation as well as liabilities for non-compliance.

The participants will be guided through the key requirements in SS638 and other codes of practice where applicable, just name a few, in protection against electric shock, over current, faults and under voltage as well as inspection, testing, etc.

Demonstration on verification of final circuit design, cable sizing and MCB rating selection, etc. will  be carried out to enable the participants to acquire the skills to ensure compliance of the requirements.


Electrical Installation and Regulatory frameworks (1/2 day)
  • The relevant Act, Regulations and SS638
  • Roles and Responsibilities of LEW and Licensee of Electrical Installation
  • Pre-commissioning checks and turn-on procedures
  • Lessons learned from court case judgments on electrical installation incidents
Design Concept of Electrical Installations (1/2 day)
  • Assessment of general characteristics of electrical installations
  • Isolation and isolation devices
  • Protective devices and conductor sizing
  • Characteristics of protective devices and their making and breaking capacities
  • Cable installation methods and current rating
  • Cable rating correcting factors
  • Voltage drop tolerance and voltage drop calculation
  • Temperature correcting factor for resistance
Over Current and Fault Protection; selection of protective conductors (1/2 days)
  • Protection against overcurrent faults and earth leakage
  • Fault current calculation
  • Separated extra low voltage system
  • Understanding earthing and protective conductor sizing
  • Earth leakage protection devices
  • Protection against shock
  • Earth fault loop impedance and touch voltage
Installation design procedure; inspection and testing; and worked examples (1/2 day)
  • Shunt trip and direct acting trip
  • Characteristic of IDMTL relays and relay setting
  • Protection grading and discrimination
  • Protection against direct and indirect shock
  • Worked example & computer based wiring design application & demonstration
  • Inspection and testing
  • Location specific application
  • Solar Photovoltaic power supply system
  • Outdoor applications
  • Cable capacities of conduit and trunking


Er. Nicholas Lee Poh Choo
PEng, BEng (Electrical), Consultant, Carlo Solutions

Er. Lee has had more than 40 years’ experience in the public utility sector holding several senior positions when he worked in SP Power Grid. He was involved in the predictive and condition-based maintenance to improve network reliability and power quality in the power distribution network. Er. Lee is experienced in the operation of power generators; as well as planning, development and management of electrical transmission and distribution networks. He had carried out consultancy works for utility companies in India, China, South Africa and the Middle East. Er. Lee obtained his degree in Electrical Engineering from University of Singapore.ore in 1972.

Mr. HC Lim

BEng, MSc (IE), LLB (Hons), BSc (Economics) Hons, P.Eng, C.Eng is Principal Consultant of Pinnacle Engineering and Management Consultancy. He also holds specialist diplomas and advanced diploma in Funds Management and administration, E-Commerce Technologies and Multimedia Development from the local polytechnics, a cer1ified diploma in Accounting and Finance from ACCA and a Graduate Certificate in Interna1ional Arbitration from the Faculty of Law, NUS. Mr Lim was Director (Contracts) of the Network Development Division, SP Power Grid before venturing into training and management consultancy services. He has had more than 30 years’ experience in the transmission and distribution network development, operations and maintenance, street lighting operations, management of safety and security units and support services for the company’s operations. He is a SOP accredited adjudicator, a fellow of the Singapore Institute of Arbitrators, an accredited mediator of SISV Panel of Mediators and a certified WSQ ACTA trainer and assessor.

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