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Wire current-carrying meter

Wire current-carrying meter

Wire Specifications 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240 mm2. Not commonly used are: 0.5, 0.75, 300, 400, 500 square millimeters, etc. 2.5 flat copper wire = 4 flat aluminum wire 5 × 4 = 20A plus the electricity of the tube 20 × 0.8 = 16A, that is, the choice of 2.5 flat copper wire or 4 flat aluminum wire, they are wearing the tube The current of 16A can be carried. Use 5000w electric appliances to use a few square wires national standard gb4706.1-1992/1998 specified wire load current value (partial) copper core wire: copper core wire cross-sectional area allows long-term current 2.5 square millimeters (16A ~ 25A) 4 square millimeters ( 25A~32A) 6mm 2 (32A~40A) Aluminum core wire: Aluminum core wire cross-sectional area allows long-term current 2.5 square millimeters (13A~20A) 4mm 2 (20A~25A) 6mm 2 (25A~32A) :
 
1. Each computer consumes about 200~300w (about 1~1.5a), so 10 computers need a 2.5mm square copper wire to supply power, otherwise fire may occur.
 
2, the large 3 air conditioner consumes about 3000w (about 14a), then a single air conditioner needs a separate 2.5 square millimeter copper core wire to supply power.
 
3. The current housing entrance line is generally 4 square millimeters of copper wire. Therefore, the household appliances that are simultaneously turned on must not exceed 25a (ie 5,500 watts). It is useless to replace the wires in the house with 6 square millimeters of copper wire. Because the wires that enter the meter are 4 square millimeters.
 
4, the early housing (15 years ago) incoming line is generally 2.5 square millimeters of aluminum wire, therefore, the household appliances that are simultaneously open must not exceed 13a (ie 2800 watts).
 
5, the household appliances with relatively large power consumption are: air conditioner 5a (1.2 horses), electric water heater 10a, microwave oven 4a, rice cooker 4a, dishwasher 8a, washing machine 10a with drying function, electric water heater 4a caused by power supply In the fire, 90% of the joints are caused by the heat of the joints. Therefore, all the joints must be welded. The contact parts that cannot be welded must be replaced in 5 to 10 years. (such as sockets, air switches, etc.) The long-term current allowed by the national standard is 4 square meters. The square is 25-32A. The square is 32-40A. In fact, these are theoretical safety values. The limit value is even larger than these. The 2,5 square copper wire is allowed to be used. The maximum power is: 8000w of 5500w.4 square, 6 square 9000w no problem. For example: How to find the width of the electric power of household appliances? The selection of household wire specifications should be based on the total power of the household appliances, and then select the appropriate wire and cable according to the maximum current carrying capacity of the wires of different specifications. The required current carrying capacity calculation should be based on the following formula: where: Imax = w / u × k Imax - the maximum current capacity required by the line, the unit AW - the total power of household electrical energy, the unit WU - the rated voltage of the household, the unit V k - The safety factor of the voltage, the value is generally 1.2 to 1.3. In fact, it is very simple. The power learned before is equal to the voltage multiplied by the current, and the current is calculated. In order to ensure safety, a margin is given. After calculating, the cross-sectional area of ​​the wire is required. It is. For the copper wire, the copper wire is now used for decoration. If the aluminum wire is eliminated, the current is equal to 8×(S 0.625). S is the cross-sectional area of ​​the wire, and the unit is square millimeter. The cross-sectional area is gone.