The night scene of Hong Kong is always representing the prosperity and the stunning pictorial attraction for many people . The backdrop of the night scenery is the densely packed high-rise buildings being lit up.
With the air-conditioning became introduced in Hong Kong , some traditional luxury residential development was designed with 3 phases supply to cope with the loading consumption
Effect of Neutral Loss and Over-heat
The 3-phased live wiring is pairing with the neutral wire. The power runs into your apartment through “live” and return through “neutral . There is a defect called “nentral loose” which means the neutral wire loose contact or in bad connection. If there is “neutral loose” , that may be caused by various reasons, there will be abnormal arcing around the point of connection, a flash phenomena or spake fire will be occurred from time to time to heat up the already loose connection point and adversely causing unpredictable loading of electric current passing through the entire circuit. This circuit connects the load side appliance such as air-conditioners, the electronic parts or protection fuses of these electrical appliances may be damaged.
Inspection by Infra-red scanning and WR 2 checking
Unfortunately, it was not always detectable the abnormal heat up around the connection point . I prefer to adopt the infrared thermography scanning technique in my project or my inspection. However, the electrician today prefer to do by visual inspection which in my view may be subjective in some occasion. Our in-house infra-red is E4 model from FLIR. This is not the latest model, but still fit to our general routine checking.