The Outstanding Registered Electrical Worker Awards Scheme cum Outstanding Registered Electrical Contractors Competition 2019 had been completed smoothly. EMSD has produced two short videos to share with the electrical trade insights of the winners for trade members’ reference so that they can learn about how the winners promote and implement a work safety culture at work.
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Electricity leakage may occur if there are damaged cables or faulty electrical equipment near the works area when carrying out electrical work. The condition above false ceiling is even more complicated. Mr NG Tsz-kwan proposed to tie voltage testers onto an “extendable selfie stick” prior to commencement of works, which enables electrical workers to check whether there is electricity leakage near the ceiling grid using the extendable stick at ground level. This can prevent accidents to workers caused by inadvertent touching of the live false ceiling.
In recent years, photovoltaic (PV) modules (solar panels) have been installed on the rooftops of many buildings to convert solar energy into electrical energy through PV effect for use. Nevertheless, cables may be live upon connection of the solar panel to the power grid, and thus there will be a risk of electric shock. In this regard, Mr YIP Wai-hung proposed to install an indicator light or display meter at the output end of the solar panel to identify whether power is being supplied by the solar system. At the same time, a “Warning-Dual Supply” label and a solar power “Warning” label shall be posted on the system for identification so as to avoid the risk of electric shock.
Apart from lighting purpose, lights can also embellish the environment. However, cables with a voltage of 220V are still used to supply electricity to the outdoor lighting of many housing estates, commercial buildings, parks, swimming pools and shopping malls, posing a risk of electric shock if water seepage occurs. Mr LUI Tin-lung suggested that power transformers be installed for outdoor lighting and cables with an extra-low voltage of 12V or 24V be used for wiring, thereby ensuring the safety of users and electrical workers.
Workers at site are responsible for different areas of work. Mr SO King-hong, Mr FUNG Ki-wai and Mr CHAU Yiu-fong of Majestic Engineering Company Limited believed that a temporary four-pole residual current device (RCD) can be installed in the distribution board to replace the traditional main power switch before the inspection of fire service installations and delivery upon completion of works so that the circuit can be cut off swiftly when electricity leakage occurs. This helps reduce the risk of electric shock to workers by accident. Moreover, the company also proposed to replace the current design of a single distribution board cover with a “dual-door distribution board”, which can prevent accidents caused by removing the distribution board cover.
Modular integrated construction (MiC) has been actively promoted by the trade in recent years. Mr TSANG Chi-hin and Mr CHOY Yuk-ming of REC Engineering Company Limited considered that design for manufacture and assembly (DfMA) can also be adopted by the electrical and mechanical trade to save the time for on-site construction and assembly. If the trunking of each floor’s meter room is pre-assembled, electrical workers can, upon delivery of the trunking to the site, install it directly and complete such processes as cable installation and fixing of meter boards, which can save a lot of manpower and reduce the risk of accidents at site. Besides, self-made simple and small tools are used to help with the testing of in-room electrical appliances and measure the earth fault loop impedance of high-level lampholders, which can effectively improve work efficiency.
There are many workers on a works site and they are responsible for different areas of work. Some non-electrical workers may inadvertently touch a circuit under installation and cause danger. To prevent accidents, Ms NG Man-kei, Mr LEUNG Ching-cheong and Mr WONG Wai-leung of Lik Kai Engineering Company Limited proposed a temporary replacement of the main power switch with a four-pole RCD in the distribution board during the transition period before completion of works, with a view to providing workers with better protection.
