Our Services

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Licensing of High Voltage and Low Voltage Electrical Installations.

With more than 100 HT and LT electrical installations under our care, our clients include some of the biggest and most well-known companies both locally and internationally.

Due to our track record for safe practices and efficient services, our clients have been entrusted us with some of the most prestigious electrical installations island-wide such as Republic Plaza, Ocean Financial Centre and Singapore Post Centre which are the flagship buildings for CDL, Keppel Land and Singpost respectively.

We also take pride in being appointed as the LEW for Dupont, Invista, Tate & Lyle, Aventis and Keppel DHCS- companies with sound reputation for their commitment to workplace safety.

Other installations under our care include:

Retail and Office Developments – Bugis Junction, Westgate, Ngee Ann City, VivoCity
Healthcare Institution – Instituted of Mental Health, Bethany Methodist Nursing Home
Industrial Buildings – Menicon, Singapore Safety Glass, Aventis
Commercial Buildings – Singapore Post Centre, AIA Building, CapitaGreen. PSA Building
Residential/Hotels – Anchorage Condominium, Le Grove, Grand Park Orchard
Others – Logistics Buildings, Educational Institutions, etc.



1.      Invista @ Tuas Crescent
2.     AIA Building @ Alexandra
3.     Bugis Junction Tower A & B
4.     Ngee Ann City Tower A & B
5.     Republic Plaza Tower I & II
6.     Kyocera Chemical Plant
7.     Shaw House
8.     Shaw Centre
9.     Westgate Mall and Tower
10.   Singapore Safety Glass
11.   Aventis Pharma Manufacturing
12.   Changi Business Park
13.   Institute of Mental Health
14.   One George Street
15.   The Grandstand
16.   Raffles Town Club
17.   Ocean Financial Centre
18.   Whitesands Shopping Centre
19.   Fuji Xerox Towers
20.  Tate & Lyle
21.   Singapore Post

Partial Discharge (PD) Testing

Partial Discharge (PD) testing is a form of predictive maintenance used to detect electrical abnormalities on high voltage equipment such as cables, switchgears and transformers.

We utilize PD Locator, PDL01, complemented with the Ultraprobe thereby providing a comprehensive PD testing service.

Partial-Discharge-Image-1 Partial-Discharge-Image-2

Infra-red (IR) Thermography Inspection

Infra-red (IR) thermography is a form of predictive maintenance to detect thermal anomaly in electrical equipment.

IR thermography is a non-contact testing technique making it a safe and money saving tool for predictive and diagnostic inspection for electrical and mechanical equipment.


Heat build-up detected at max temperature of 32.9 oC

Likely minor poor contact.

Load condition:
~ 16A per phase


Heat build-up detected at max temperature of 52.4 oC

Likely minor poor contact.

Load condition:
~ 23A per phase


IR thermography inspection can be carried out without the need to shutdown of electricity supply, thereby not causing any disruption to the everyday operation of electrical installations.

Oil Quality Test (OQT) and Dissolved Gas Analysis (DGA)

Dissolved Gas Analysis is a form of predictive maintenance to diagnose the state of oil type transformer by determining various properties and gas contents in oil. These parameters are compared with IEEE and IEC guidelines to determine the quality of oil.

We follow strict standards in oil collection and all testing is done by accredited laboratory.

Sample Reference Historical

 Date Sampled  N/A  N/A  N/A  22/12/12  26/11/13  02/07/14  23/01/15
 Lab Reference  N/A  N/A  N/A  S42012  S60813  S72314  S87315

Dissolved Gas Analysis

 Hydrogen (H2)  N/A  N/A  N/A  98  68  28  18
 Methane (CH4)  N/A  N/A  N/A  9  20  12  9
 Ethylene (C2H4)  N/A  N/A  N/A  < 1  < 1  2  1
 Ethane (C2H6)  N/A  N/A  N/A  24  24  20  16
 Acetylene (C2H2)  N/A  N/A  N/A  < 1  < 1  < 1  < 1
 Carbon Monoxide (CO)  N/A  N/A  N/A  504  410  161  119
 Carbon Dioxide (CO2)  N/A  N/A  N/A  2152  1960  2000  1071
 Oxygen (O2)  N/A  N/A  N/A  < 500  3787  6415  18717
 Nitrogen (N2)  N/A  N/A  N/A  35891  74145  31512  47252
 Gas by Volume  N/A  N/A  N/A  3.89%  8.04%  4.02%  6.72%
 Total Combustible Gases  N/A  N/A  N/A  635  522  223  163

Font Colour Code

Font-Colour-Code-PoorStandard Test Result Indicates Oil In Service Is In “Poor” Category / DGA Indicates Fault Gas

Font-Colour-Code-FairStandard Test Result Indicates Oil In Service Is In “Fair” Category / DGA Indicates Rate Of Gas &/Or Gas Ratio Within Allowable Limit

Font-Colour-Code-GoodStandard Test Result Indicates Oil In Service Is In “Good” Category / DGA Indicates Gas Within Typical Concentration Values


SF6 Gas Leakage Check and Quality Analysis for GIS

GIS or Gas Insulated Switchgears utilizes SF6 as the insulating medium. Hence, it extremely important to ensure that there is no gas leakage and the SF6 gas quality is in good condition.

At CST, we have the equipment and necessary expertise to detect gas leakage as well as testing the quality of SF6 gas.

Parameters measured include, which includes Dew Point, SO2 content and SF6 purity, are compared with IEEE guideline to determine the quality of the gas.

All gas extracted for the analysis will be pumped back to the GIS, there are no concerns of gas depletion in the GIS and environmental pollution.

Servicing and Maintenance

In CST, we have one of the most prolific and experienced maintenance servicing team in the local industry.

We have experience with almost all brands which includes, but not limited, to the following:

  • Meiden
  • Schneider
  • Hitachi
  • Mitsubishi
  • ABB
  • Merlin Gerlin
  • Siemens
  • Areva
  • Alstom
  • Others


 Name of Electrical Installation

  • Mapletree Anson
  • The Grandstand
  • Keppel DHCS
  • One George Street
  • Whitesands Shopping Centre
  • Institue of Mental Health
  • Ngee Ann City
  • SIA Training Centre
  • PSA Vista
  • Caldecott Broadcast Centre
  • NTUC Income Centre
  • Raffles Town Club
  • Harbourfront Tower
  • King’s Centre
  • Fuji Xerox Towers
  • HSBC Building
  • 2 Bukit Merah Central
  • KPE
  • Harbour Front Centre

Testing and Commissioning
We have the expertise and equipment to provide testing and commissioning of HT and LT switchgears, power cables, transformers, busduct, etc

  • HT and LT switchgear commissioning
  • Transformer commissioning
  • Hi-Pot Test
  • Primary Injection Test
  • Secondary Injection Test
  • Pilot Wire Commissioning
  • Transformer Differential Protection Commissioning
  • Transformer Ratio Test
  • Restricted Earth Fault Commissioning
  • Cable Identification
  • Earth Resistance
  • Etc

LEW and Consultancy Services

It is important that all electrical works need to be in compliant with the local regulation and code of practices. This will ensure safety to both humans and properties.

At CST, we are able to provide consultancy services as well as LEW and Electrical Qualified Person (QP) for your project.

A partial list of the projects that we had been involved in includes:

  • CapitaGreen – Project LEW/QP
  • Westgate Mall and Tower – Project LEW/QP
  • Ocean Financial Centre – Project LEW/QP
  • One George Street – Project LEW/QP
  • International Cruise Centre – Project LEW/QP
  • Shaw Centre- LEW/QP for electrical upgrading
  • Republic Plaza – Consultant for addition of standby genset
  • Katong Park Tower – Consultant for busduct replacement
  • Genting Centre – Genset replacement
  • Keppel DHCS – LEW/QP for plant expansion
  • Dupont – LEW/QP for electrical A&A works
  • Bugis Junction – Project LEW/QP for electrical extension
  • Etc
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