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TN-S PE wire requirements

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-02-24

According to the relevant requirements of JGJ/T 16-1992 "code for electrical design of civil buildings", to protect the PE wire "should adopt the same material with phase wire", and the cross section must meet the requirements shown in Table 1. If you use other metal wire (including bare conductors and insulated wire), must carry on the thermal stability check, and the bare wire take anticorrosion treatment.

For the TN-S distribution grounding system, the feeder cable engineering used galvanized flat steel as PE wire and four core cable laying, such as to meet the above conditions, it is feasible. But in the actual engineering, the galvanized flat steel with use of time, it is easy to be corroded, the TN-S distribution main wire circuit in the PE wire, such as fracture is serious consequences. Therefore, this method is rarely used. The routine is the use of five core cable, or four core cable and a cable of the same material single core insulation cable laying. Of course, according to the design standard, if the metal sheath cable can also be used as a PE wire.

PE wire section requirements

 Phase wire section S/mm2 PE wire according to the minimum cross-section thermal stability requirements/mm2
S≦16 S
16<S≦35 16
S >35         S/2

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