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Laying and selection of broadcast cables

Publish Time: 2024-11-06

The key point of installation is to lay the line. Due to the long transmission distance, in order to ensure that the signal does not produce too much attenuation on the line. The main line uses 2X2.5mm2 multi-strand balanced line, and the branch line uses 2X1mm2 multi-strand balanced line. In order to meet the fire protection requirements, the wire tube uses flame-retardant wire trough or flame-retardant wire tube. A branch box is set at each connection point and branch point. In order to facilitate the inspection of faults, after the line is pulled, it can be measured with a multimeter. First short-circuit the line terminal and measure at the beginning with a multimeter. If it is open, it proves that the line has a circuit break problem. If the resistance is close to zero, open the terminal again, and the resistance should be infinite. Otherwise, if the resistance is not infinite, it proves that there is a short circuit problem between the two lines. In addition, it is necessary to measure whether there is a short circuit leakage between the line and the wire tube. After each section of the line is installed, it should be checked immediately, and then the equipment should be installed according to the design drawing, and the impedance of each zone to the fire protection center should be checked for any discrepancies. Finally, connect the power amplifier and listen to whether the sound of each zone is normal. Since the position of the speakers in each zone is different, the size of the coverage area is also different. In order to achieve the predetermined uniformity of the sound field, each gear of the 0~70V or 0~100V input on the speaker (inter-line transformer) can be adjusted. For example: the distant speaker can use the 0~70V gear of the inter-line transformer, and the nearby speaker can use the 0~100V gear, depending on the specific situation.


Table of wire cross-sectional area used by broadcast power amplifier


Load power

60W

120W

250W

350W

450W

650W

1000W

1500W

Cross-sectional area

mm2

mm2

mm2

mm2

mm2

mm2

mm2

mm2

Output voltage 70V

Load power

60W

120W

250W

350W

450W

650W

1000W

1500W

Within 100 meters

0.50

0.50

0.50

0.75

1.00

1.50

2.00

4.00

Within 250 meters

0.50

0.75

1.50

2.50

2.50

4.00

6.00

 

Within 500 meters

0.75

1.50

2.50

4.00

6.00

6.00

 

 

Within 1000 meters

1.50

2.50

6.00

 

 

 

 

 

Output voltage 100V

Load power

60W

120W

250W

350W

450W

650W

1000W

1500W

Within 100 meters

0.50

0.50

0.50

0.50

0.75

0.75

1.50

2.50

Within 250 meters

0.50

0.5

0.75

1.00

1.50

2.50

4.00

6.00

Within 500 meters

0.50

0.75

1.50

2.50

4.00

4.00

6.00

10.00

Within 1000 meters

0.75

1.50

4.00

4.00

6.00

10

 

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