-
Anonymous users2024-02-10Formula for calculating the current of electrical equipment.
Electric heating, incandescent lamp, tungsten halogen lamp current.
Power supply Power (W) Current (a) Calculation formula Remarks.
220V single phase 1000 current (a) = power (w).
220(v)
220 380V two-phase three-wire 1000 Current (a) = power (W) The phase wire and center line current are the same.
440(v)
220 380V three-phase four-wire 1000 Current (A) = Power (W).
380V single phase 1000 Current(a)= Power(W) Electric heating according to this specification.
380(v)
Calculated current for lighting fixtures with a power factor of less than 1.
220V Single Phase 1000 Fluorescent Lamp Current (A) = Power (W) 1000 220*
9(a) 220V* Power Factor.
220 380V two-phase three-wire current (a) = power (w) The phase line and center line current are the same.
440V* Power Factor.
220 380V three-phase four-wire current(a)= power(w) fluorescent lamp, 3(a) 1000
Factor. Fluorescent lamps (power factor.
High-pressure mercury lamps (power factor.
Metal halide lamps (power factor.
High-pressure sodium lamps (power factor.
Tubular light (power factor.
Current calculation table for electric motors.
Single-phase motor 1 8(a) Current(a)= Power(W)*1000 Power factor is calculated, efficiency is calculated.
220 * power factor * efficiency.
Three-phase motor 1 2(a) Current(a)= Power(W)*1000 Power factor is calculated, efficiency is calculated.
Power Factor * Efficiency.
Pipe diameter = wire + heat dissipation space. For example, the pipe diameter of 20 can penetrate into the wire of 3* + 40% of the heat dissipation space, the current carried by the PVC pipe is 18A, and the current carried by the steel pipe is 21A. For example, the pipe diameter of 20 can be penetrated into 4*15 wires + 40% of the heat dissipation space.
The current carried by PVC pipes is 13A, and the current carried by steel pipes is 17A
-
Anonymous users2024-02-09Step 1: Select this part of the circuit breaker according to the current, the rated current of the circuit breaker is larger than the calculated current, for example, the calculated current is 40A, you can choose the circuit breaker of 50A, in order to leave a margin should choose the circuit breaker of 63A; If your calculated current is 35A, then you can choose 50A, which is the problem of the designer's reasonable choice and degree;
Step 2: Select the wire according to the rated current of the circuit breaker, the first thing is to determine whether it is single-phase or three-phase, and the single-phase wire size should be selected according to the current carrying capacity of 2 according to the atlas, and the current-carrying current should be greater than the rated current of the circuit breaker, which can not be too large and will cause waste.
Step 3: Select the size of the pipe according to the area and number of wires selected, the type of wire (YJV or BV) and the type of pipe (SC or PVC).
-
Anonymous users2024-02-08First, according to the calculated current to adjust the switch, the switch setting value is: Then check the current carrying capacity meter and select the cable according to the setting switch value. Select the cable, and then go to the table to select the diameter of the protective pipe you are wearing.
-
Anonymous users2024-02-07Formula for calculating the current of electrical equipment.
Electric heating, incandescent lamp, tungsten halogen lamp current.
Power supply. Power (W).
Current (a) is calculated by formula.
Remarks: 220V single phase.
Current (a) =
Power (W) 220 (V).
220 380V two-phase three-wire.
Current (a) =
Power (W) phase line, center line.
The current is the same. 440(v)
220 380V three-phase four-wire.
Current (a) =
Power (W) 380V single phase.
Current (a) =
Power (W) electric heating according to this specification.
380(v)
Calculated current for lighting fixtures with a power factor of less than 1.
220V single phase.
Fluorescent lamp current (a) = power (w).
9(a) 220V* Power Factor.
220 380V two-phase three-wire.
Current (a) =
Power (W) phase line, center line.
The current is the same. 440V* Power Factor.
220 380V three-phase four-wire.
Current (a) =
Power (W) Fluorescent lamp, 3 (a).
Factor. Fluorescent lamps (power factor.
High-pressure mercury lamps (power factor.
Metal halide lamps (power factor.
High-pressure sodium lamps (power factor.
Tubular light (power factor.
Current calculation table for electric motors.
Single-phase motors. 18(a)
Current (a) =
Power(W)*1000
The power factor is calculated and the efficiency is calculated.
220 * power factor * efficiency.
Three-phase motor. 12（a）
Current (a) =
Power(W)*1000
The power factor is calculated and the efficiency is calculated.
Power Factor * Efficiency.
Pipe diameter = wire + heat dissipation space. For example, the pipe diameter of 20 can be penetrated into the wire of 3* + 40% of the heat dissipation space, PVC
The current carried by the pipe is 18A, and the current carried by the steel pipe is 21A. For example, the pipe diameter of 20 can be penetrated into 4*15 wires + 40% of the heat dissipation space. pvc
The current carried by the pipe is 13A, and the current carried by the steel pipe is 17A
Find a few electrical construction specifications and construction drawings and take a look.
The floor area calculation value is specific and has a specific calculation method. >>>More
Calculation rules for building area: construction area, building area in the suite, shared area. >>>More
To know the principle first, in fact, it is very simple, remember that the "Building Construction Manual" has the use of a level, and there is a simple diagram, just look at the diagram to understand. >>>More
Let's go one by one. 1. In addition to the two you said, you should also add a lightning protection calculation to the general calculation number. Short-circuit currents are generally not counted. Censorship is not required either. >>>More