Electrical riser replacement is one of the critical repairing items for buildings. Lack of planning and design may lead to serious issues such as power supply failure, equipment failure, and so on. The Chiller system is one of the important facilities which can affect the owners and tenants during the summer period especially the summer temperature become higher and higher compare to ten years before. The maintenance schedule may also be affected due to such weather change and shorten the period of time for repairing and maintenance. Therefore, the replacement and repairing works can only be scheduled during December to March. Planning for temporary electricity supply is one of the most critical issues which will affect tenant and daily operation. Weekend and night time will be the best options for such replacement in order to minimize the affection to tenants and owners. Phase by phase schedule has to be well planned for continuous air conditioning supply is also important to prevent sudden power or equipment failure. Preserve enough time for a test run is also important for preventing any kind of accident in the daytime. Planning and design carefully is always the most important part of project management.
