【 Building materials network 】Home wiring can be said to play a very important role in the family. At the same time, its quality also affects the safety of people's use. So when choosing, not only should you choose well, but also should know how to distinguish its color. The following editor will introduce to you power cord What kind of wires does the color represent and what specifications are used for general household wiring.

What does the power cord color represent

1. Three phase five wire system: the color of the power line first includes three AC phase lines (A, B, C lines) and neutral line (N line); And ground wire (PE wire). Three phase five wire standard conductor color: A line, B line blue (green), C line red, N line brown, PE line yellow green or black.

2. The voltage between the phase lines of the civil power supply line (i.e. line voltage) is 380V, and the voltage between the phase line and the ground wire or neutral line (i.e. phase voltage) is 220V. For example, as for the incoming line, generally speaking, the single-phase three wire system is also used, that is, one phase plus the neutral line (as the neutral line) and the ground wire among the three phase lines.

The phase line (that is, live line) of 220V AC is red or brown, because these two colors are hot. Generally speaking, you can use blue or green when using zero line, and black or yellow green ground wire. Generally, the phase line is red, the neutral line is blue, and the grounding line is black and yellow green.

3、 DC power supply Line: red indicates positive pole, black indicates negative pole

BVV2 × 2.5 and BVV2 × 1.5 wires should be used for household power lines. BVV is also a national standard code, which is copper sheathed wire BVV2 × 2.5 and BVV2 × 1.5, representing 2-core 2.5 mm2 and 2-core 1.5 mm2 respectively. In general, BVV2 × 2.5 is used as the main line and trunk line, and BVV2 × 1.5 is used as a single electrical branch line switch Line. one-way air conditioner BVV2 × 4 is used for special line, and special ground wire is additionally provided.

What specifications are used for general household wiring

1. The length of each roll of BVV2 × 2.5 is 100 ± 5 meters. Generally speaking, the price of this roll is about 280 yuan in the market. The length of irregular products varies from 60-80 meters. Some manufacturers make the insulation sheath thick, making it difficult for professionals to see the problem. You can count the number of turns of the wire, and then multiply by the radius of the whole roll to roughly calculate the length. The price of this kind of products is 100-130 yuan.

2. The wires used in home decoration are generally single stranded copper core wires with three main specifications of sectional area, namely 4.0mm2, 2.5mm2 and 1.5mm2. In addition, there are 6.0mm2 specifications, which are mainly used for incoming trunk lines. They are rarely used or used in home decoration, and are generally not included in the range of wires for home decoration circuits.

3. For the sake of fire prevention, maintenance and safety, you are choosing the "National Standard" copper core wire with the Great Wall logo for the specifications of household wires. The area of wire trough load is generally: the specifications of household wires are 1.5 mm2 for lighting, and Socket The wiring shall be 2.5 mm2, and the air-conditioning wiring shall not be less than 2.5 mm2. The negative wire (neutral wire/ground wire) at home shall be green and yellow, while the switch wire (live wire) shall be red, white, black, purple, etc. The color and purpose of the lines we use in the same home decoration project should be consistent.

Summary: This is the introduction of what the color of the power cord represents and what specifications are used for general household wiring. When installing wires, you should first make sure that different colors represent different meanings, so you must understand this in advance.