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Civil building low-voltage distribution lines section choice

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-02-17 Because the electricity load for the vast majority of single-phase load of civil buildings, the three-phase unbalanced load will inevitably lead to the midline by unbalanced current; with the development of computer and various household appliances and popularization, low voltage power network harmonic pollution is becoming increasingly serious, and the odd multiple of 3 times harmonic constitute a neutral current. The overcurrent resulting in electrical fires are also more and more. Therefore, the relevant design standard has stipulated "three-phase four line or two phase three wire distribution line, when the electricity load for the majority of single phase load, the N line or PEN line section should not be less than the phase section; using the gas discharge lamp as the main load circuit, N line section should not be less than the phase line section......" Visible, the distribution system of civil buildings, trunk, branch wire section principle lines and extensions of the N or PEN shall be selected line section of line with the same cross-section. However, supervision review found that the current still has 80's still used in power distribution design of civil building many of which had been used in practice, the N or PEN line section selection remains as one of the 1 / 2 or 1 / 4 to 1 / 3 which is the most common electrical design safety line.
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