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Distribution Box Three-phase Five-wire Process
- Jun 14, 2017 -

The three-phase five-wire system comprises three phases of three-phase power (A, B, C line), Distribution Box neutral line (n-line) and a ground line (PE line). Distribution Box The neutral line (n line) is the 0 line. When the three-phase load is symmetrical, the current vector of the three-phase line into the neutral line is zero, but for a single phase, the current is not zero. When the three-phase load is asymmetric, Distribution Box the current vector of the neutral line is not zero, and the earth voltage is generated.

Three-phase five-wire standard conductor color: A line of yellow, B-line green, C-line red, n-Line light blue, PE line yellow-green.

The three-phase five-wire system is divided into TT grounding mode and TN grounding method, in which TN is divided into S, Tn-C,-three kinds of way.

The three-phase five-wire system is divided into TT grounding mode and TN grounding method, in which TN is divided into S, Tn-C,-three kinds of way.

TT Grounding mode:

The first letter T indicates the neutral grounding of the power supply, the second T is the equipment metal shell grounding, this method is widely used in high-pressure systems, Distribution Box low-voltage systems with large capacity in the use of electrical appliances.

s grounding mode:

The letter s means that n is separated from PE, the equipment metal casing is connected with PE, and the device neutral point is connected with N.

The advantage is that there is no current in PE, so the metal shell of the equipment is zero to ground potential. Mainly used for data processing, precision detection, Distribution Box high-rise building power supply system.

Tn-C Grounding mode:

The letter C indicates that N and PE are merged into pen, which is actually four-wire power supply. The device neutral point and the metal casing are connected with N. Distribution Box Due to the normal flow of n-phase unbalanced current and harmonic current, the equipment metal casing has a certain voltage, usually used for general power supply.

-Grounding mode:

Part N and PE separate, is four line half power supply mode. Apply to places where the environment is poor.

Merge is not allowed when N and PE are separated.

China stipulates that the voltage (i.e., line voltage) between the phase line of the civil power supply line is 380V, and the voltage (i.e. phase voltage) between the phase line and the ground or neutral line is 220V. The feeder line generally adopts single-phase two-wire system, that is, Distribution Box any phase and neutral line in three phase lines (0 lines). In case of high-power electrical appliances, the need to set the ground line.

Three-phase five-wire standard conductor color: A line of yellow, B-line green, C-line red, n-Line light blue, PE line yellow-green.


The three-phase five-wire system comprises three phases of three-phase power (A, B, C line), neutral line (n-line) and a ground line (PE line). The neutral line (n line) is the 0 line. When the three-phase load is symmetrical, the current vector of the three-phase line into the neutral line is zero, Distribution Box but for a single phase, the current is not zero. When the three-phase load is asymmetric, the current vector of the neutral line is not zero, and the earth voltage is generated.