# Building electrical 100 common problems, understand you are an expert!

3.

How many wires are there between the distribution frame and the dual port information panel? Answer: two class 5 unshielded twisted pairs.

11.

Conduct plug conversion in the embedded box.

How many wires are there between the intelligent switch module and the electric lamp? What wire is used and what is the signal of each core wire? Answer: there is a 3-core wire between the intelligent control switch module and the electric lamp, using rvv3 × 1.0 wire, the signal of each core wire is live wire in, live wire out and zero wire} 10.

The signal of each core wire is 1 and 2, which are the home bus signal wires, 5 and 6 cores are the audio bus, 3 and 7 are the positive pole (+ 12VDC) of the power supply, and 4 and 8 are the negative pole of the power supply; The second is the video cable, syv-75-3 (or 5) coaxial cable, which is used for the image signal of the door machine; The third is the power line of visual intercom display screen, with the model of rvv2 × 0.5, 12VDC power supply.

If there are more than three elbows, it is recommended to reduce the number of lines.

The specification requires that the cable shall not exceed 30-40% of the conduit capacity.

The first is class 5 unshielded twisted pair, of which two cores are signal wires, two cores are audio wires and two cores are communication wires; The second video cable, syv-75-3 (or 5) coaxial cable, is used for image signal of door machine.

15.

17.

When making RJ45 head, what is the line sequence (1-8)? A: from 1 to 8, the order is: white orange, orange, white green, blue, white blue, green, white brown, brown.

8.

16.

Ethernet computers generally use several cores in RJ45.

How many wires are there between the intelligent control box and the non visual intercom indoor unit? What wire is used and what is the signal of each core wire? A: the intelligent control box and the non visual intercom indoor unit are connected by a category 5 unshielded twisted pair (UTP).

14.

Which core of RJ45 is used for the telephone? A: two cores, the 4th and 5th cores respectively.

Source: if there is infringement on the network, please contact to delete 1.

13.

How many wires are there between the unit door machine and the embedded box at the unit door (unit door controller)? A: there are three lines.

9.

7.

A PVC Φ How many UTP lines are generally used for 20 pipes? A: generally, three lines can be taken.

How many wires are there between the meter reading module and the pulse meter? What wire is used and what is the signal of each core wire? Answer: there is a four core wire between the meter reading module and the pulse meter, using rvv4 × 0.3 wire, the signal of each core wire is that the electricity meter has only two core signal wires, the water meter and gas meter have two core power wires and two core signal wires, and the power ground and signal ground can also share one core wire, which can save one core wire.

Which cores? A: four cores are used, namely the first, second, third and sixth cores.

The signal of each core wire is 1 and 2, which are home bus signal wires, 3, 5 and 7 are power positive (+ 12VDC), and 4, 6 and 8 are power negative.

How many wires are there between the distribution frame and the single port information panel? A: a class 5 unshielded twisted pair.

How many wires are there between the intelligent switch module and the power socket? What wire is used and what is the signal of each core wire? Answer: there is a 4-core wire between the intelligent control switch module and the power socket, using rvv4 × 1.5 wires.

6.

The first is the connection of category 5 unshielded twisted pair (UTP).

2.

The first is class 5 unshielded twisted pair, in which two cores are unlocking signal lines, two cores are audio lines and two cores are communication lines; The second is a 12VDC power cord, model rvv2 × 0.5； The third video cable, syv-75-3 (or 5) coaxial cable, is used for image signal of door machine.

4.

Conduct plug conversion in the embedded box.

5.

If it is a dual pulse meter, the 4 wires are full.

How many wires are there between the unit digital auxiliary machine and the unit auxiliary machine power box? What wires are used and what is the signal of each core wire? Answer: there are two wires, both of which are rvv2 × 0.5。 The first one is 12VDC power line; The second one is the unlocking signal line..

Conduct plug conversion in the embedded box.

How many wires are there between the module and the detector? What wire is used and what is the signal of each core wire? Answer: there is a four core wire between the module and each detector, using rvv4 × 0.3.

The first one is a video line, the model is syv-75-3 coaxial cable, and the image signal of the door machine; The second is the power line of visual intercom display screen, with the model of rvv2 × 0.5, 12VDC power supply.

How many wires are there between the intelligent control box and the intelligent combination machine? What wire is used and what is the signal of each core wire? A: there are three wires between the intelligent control box and the intelligent combination machine.

How many wires are there between the unit door machine and the unit digital auxiliary machine? What wire is used and what is the signal of each core wire? Answer: there are two wires between the unit door unit and the unit digital auxiliary unit.

How many wires are there between the keyboard and the module? What wire is used and what is the signal of each core wire? A: the keyboard and the module are connected by a class V unshielded twisted pair.

The signal of each core wire is 1 and 2, which are the home bus signal wire, 5 and 6 cores are the audio bus, 3 and 7 are the positive pole (+ 12VDC) of the power supply, and 4 and 8 are the negative pole of the power supply; If it is equipped with display components, add 2 lines.

12.

The signals of each core wire are live wire in, live wire out and two zero wires.

The signals of each core wire are 1 and 2 home bus signal wires, 3, 5 and 7 power positive (+ 12VDC), and 4, 6 and 8 power negative.

The signal of each core wire is two core power lines and two core signal lines.

How many wires are there between the intelligent control box and the intelligent control keyboard? What wire is used and what is the signal of each core wire? A: the intelligent control box and the intelligent control keyboard are connected by a category 5 unshielded twisted pair (UTP).

The power ground and signal ground can also share one core wire, which can save one wire, and only two cores are used for door magnet and emergency button.

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