Into the line of the total residential installati

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Into the line of the total residential installation of residual current circuit breakers

Electric shower, unfortunately killed by electric shock, which is a typical ground fault caused by an electrical shock due to the fault occurred in the trunk, the RCD can not work indoors, not because of fault current, the total of residential into the melting line wire no action. If the total fitted into the line of RCD, can avoid the accident occurred. Installed into the line of the total leakage circuit breakers, the whole residential building in the distribution lines and electrical equipment were within the scope of its protection. \Therefore, the total leakage circuit breakers into the line tends to have a 0.25 - 0.30s delay, \, but does not guarantee the equipment or ground short-circuit fault line does not occur, once the ground fault in these places, when the ground fault current will not meet the set back on the road circuit breaker (MCB) of the instantaneous current value, MCB cut off the fault line is not instantaneous, and the total leakage circuit breakers will move into the line, avoiding ground fault arc of fire, ensure the safety of Route [Citation. Therefore, the total residential installation into the line of RCD is required, but there are also some disadvantages. 4 Failure of the scope and fire equipment into the line of the total leakage circuit breaker RCD action, the entire residential building power outage, which requires a continuous and reliable power supply for those who developed region, some inappropriate. For example, Figure l of a high-end residential, the total set into the line of leakage circuit breakers, residual operating current setting is 300mA, and with the 0.25s delay, household lighting and air-conditioning outlet distribution box circuit leakage switch is not set, the other socket circuit has a leakage switch. Building into use, to the whole building power outage occurred many times, and the property management office is difficult to identify the point of failure. Because leakage circuit breakers tripped, without identifying the point of failure and troubleshooting hard before closing, only after all the wind up to throw a one to determine the fault position. Sometimes an individual project design and construction of 10 No. 6 35 residential distribution system example Figure l Figure residents not at home, want to find fault is immune. Interrupt the power supply resulting long time, sometimes as a temporary failure, although transmission can switch on, but there is always the possibility of another trip. Given the range of residual current trip, and it was suggested that the building line of the total installed power leakage into the alarm signal. Advantage is not due to malfunction or actual leakage power is interrupted, there may only install a leakage signal on the line, the system can no longer fire the following levels to install RCD, but households to install RCD. I believe that with a management center for monitoring or residential district within the electrical professional management, to take such a program is feasible, but for the average home, as the case may be. The idea that the total residential installation of fire into the line of the selective distribution system RCD to cause trouble, there are other important fire pump into the line of the total residential load should not be installed at the RCD. \The \To ensure the selectivity of the system, the higher should be more lower level with a time delay RCD and RCD higher rated residual operating current and lower the ratio of the rated residual operating current of at least 3. Load is two or more fire pumps, power requirements do not ask off, not allowed to install RCD, but an alarm signal. So if the system then there is the important fire pump load, the total fire power should be installed in the front gate. 5 Conclusion electrical fire protection is related to people's lives and property safety of the major issues. Although the total residential installation into the line of fire RCD, at the expense of the reliability of continuous power supply, but for now the actual situation of our existing, it is the best and practical measures. Despite the promulgation of residential design, I believe that through continuous research, continuous improvement, continuous improvement, there will be home safe and reliable electricity supply to reduce our electrical fire, the people's life safety are protected. Port References: [1] GB50096-1999. Residential Design Code [s]. [2] Hou Yu. Of earth fault arc of fire prevention [J]. Electrical World, 2001, (11). [3] GB50054-95, low voltage power distribution design [S]. [4] accounted for Chiang Mai. With Residual Current Protection Circuit Breaker and technical barriers and countermeasures [J]. Electrical engineering applications. 2002. (2). Tel t010-68347408010-68394071 Fax :010 -88378034 Contact I Yu Yang Liu Ye
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