Let’s take a detailed look at how many watts can be loaded in 1, 1.5, 2.5, 4, and 6 square wires.
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1 square line: wire with cross-sectional area of 1 square millimeter
If we follow the formula: area = radius²×3.14 to calculate
Then 1 square line = 1.13mm
1, how much can a 1 square wire load
1, how much can a 1 square wire load
1 A commonly used "empirical formula" for electricians: as long as it is a copper-core wire, the cross-sectional area of 4-5A can safely pass through the rated current of 4-5A; in a 220V single-phase circuit, the current per 1KW of power is about 4.5A; in a 380V three-phase balance circuit, the current per 1KW of power is about 2A. The above values are very similar to those calculated using physical calculation formulas, so in order not to remember those "cumbersome" calculation formulas, electricians can remember these in order not to remember those "cumbersome" calculation formulas. Then according to this algorithm, we know that if the copper core wire with a cross-sectional area of 1 square millimeter is used in a 220V single-phase circuit, it can safely carry the current through the load of 1KW; if it is used in a three-phase balanced load (such as a motor) circuit, it can safely carry the current through the load of 2.5KW.
2. How many watts can a 1.5 square wire load
If the power cord is a copper core wire, first, the maximum allowable working current for the open wire installation is 20A, that is, 4400W; second, the concealed steel pipe, the current is 16A, and the power is 3520W; third, the concealed PVC pipe, the current is 14A, and the power is 3000W.
3. How many watts can a 2.5 square wire load
2.5 square wire How many kilowatts of power is poured? The load current value of wires specified in the national standard GB4706.1-1992/1998, copper core wire 2.5 square millimeters 16A~25A, about 5500 watts, aluminum core wire 2.5 square millimeters 13A~20A, about 4400 watts, 220VAC voltage does not exceed 10A for a long time, and most of the time does not exceed 15A is considered safe.
4. How much can a 4-square wire load
Single-phase power supply 1KW is about 4.5A, and 8KW is about 36A. The current carrying capacity of 4 square wires (a single plastic copper wire) is about 30A, smaller, change to 6 square wires (single-run power supply). Your meter and gate must be replaced with larger ones. Don't need such a high power, the minimum is 4KW, which is OK. 4 square wires can carry kilowatts of electricity to the 4 square wires, it depends on whether you use 220v electricity in the home or 380v in the factory. If the 220 4 square wires can load 6 to 8 kilowatts.
5. How many watts can a 6-square wire load
How many kilowatts can a 6-square wire load? There is no direct connection between the power line diameter and the power transmitted. Generally speaking, a 6 square wire is more than enough to be used as an air conditioner wire. The maintenance power supply on the construction site generally uses 10x6+1x4 cables. As for the current strength it bears, according to my construction experience, this kind of cable is generally controlled with a 63A air switch. Aluminum wire of 6 square meters can load 6 kilowatts, and a copper wire of 6 square meters can load 10 kilowatts.
Common tools for electricians are divided into three categories: general tools, line installation tools and equipment decoration tools.
1. General Tools
General Tools refer to tools that electricians often use in their work.
It is an appliance used to determine whether there is a power supply on an electrical equipment or line. It is divided into low pressure and high pressure.
(1) How to use low-voltage electrical tester
When using, you must touch the metal part of the end of the pen, and make the small window of the neon tube backlit and face itself, so as to observe the brightness and darkness of the neon tube
(a) Pen type (b) Screw type
1) When using a pen to test the charged body, the current forms a power circuit through the charged body, the pen, the human body and the earth. As long as the potential difference between the charged body and the earth exceeds 60v, the neon tube in the pen will glow. The voltage range detected by the low-voltage electrical tester is 60~500V.
2) In order to prevent the pen tip from touching the human hand, an insulating sleeve must be placed on the metal rod of the screw screw test pen, leaving only the blade part for testing.
3) The tester cannot be damp, cannot be disassembled or installed at will or subjected to severe vibration.
4) Testing should be done on live bodies frequently to check whether they are intact. Unreliable tester pens are not allowed to be used.
5) If a single wire in the neon tube emits light during inspection, it is DC power; if both wires emit light, it is AC power.
Note: Before using
, the electrical tester must be tested at a power supply to prove that the electrical tester is indeed good before it can be used.
When checking electricity, the electrical tester should gradually approach the object to be tested until the neon tube is shiny. When checking electricity, the finger must touch the metal body at the end of the pen, otherwise the charged body will be misjudged as a non-activated body.
When checking electricity, prevent your finger from touching the metal part of the pen tip to avoid electric shock accidents.
(2) How to use high-voltage electrical tester
1) Two people should operate during use, one of them should operate and the other should be supervised.
2) When outdoors, it must be used in sunny days.
3) Personnel who conducts electricity inspection operations must wear insulated gloves that meet the requirements and hold them correctly.
4) Before use, test on the charged body to check whether it is intact. Unreliable electrical testers are not allowed to be used. High-voltage electrical testers should undergo voltage withstand tests every six months to ensure safety.
Wire cutters are widely used in electrical work
1) Jaws: used to twist or clamp wire heads.
2) Tooth opening: used to tighten or loosen nuts.
3) Blade edge: an insulating layer used to shear wires or cut soft wires.
4) Cutting mouth: used to cut harder metal wires such as steel wire and lead wire.
(1) An insulating tube must be installed on the clamp handle.
(2) The shaft pin of the clamp head should be lubricated frequently.
Notes
Before use, check whether the wire cutter is insulated well to avoid electric shock accidents during live operation.
When cutting wires with live, you must not use the knife edge to cut two wires of different potentials at the same time (such as phase line and neutral line, phase line and phase line, etc.) to avoid short circuit accidents.
When the screwdriver is large, in addition to clamping the handle with the thumb, index finger and middle finger, the palm must also press the end of the handle to prevent it from slipping off when turning.
The screwdriver is small, use your thumb and middle finger to hold the handle, and use your index finger to press the end of the handle and rotate it vigorously.
When the screwdriver is long, press the handle with your right hand and turn it, while holding the middle part of the driver with your left hand (do not place it around the screw to avoid scratching your hands) to prevent the driver from slipping off.
Notes
When working with live, your hands should not touch the metal rod of the screwdriver to avoid electric shock accidents.
As an electrician, you should not use a screwdriver that goes straight to the top of the grip.
To prevent the metal rod from touching the human body or adjacent to the charged body, the metal rod should be fitted with an insulating tube.
Electrician knives are commonly used electrician tools for cutting or cutting.
(1) When using it, the blade should be operated facing outward. After use, the blade should be folded into the handle.
(2) The handle structure of the electrician knife is not insulated, and the electrician knife cannot be used on the live body to avoid electric shock.
(3) The edge of the electrician knife should be ground into an arc-shaped edge on a single side. When cutting the insulating layer of the insulating wire, the arc-shaped cutting surface must be attached to the wire for cutting, so that the cutting edge will not easily damage the core.
is the most commonly used tool used by electricians to hold the most commonly used tools. The shape is shown in Figure 4. Tie the belt around the waist when in use.
is specially used to cut various wires and cables
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Before welding , the oxide layer of the solder head should be removed and tinned with flux, so that a thin layer of tin is often maintained at the front end of the solder head to prevent oxidation, reduce energy consumption, and have good heat conductivity.
When welding wires with soldering irons, solder and flux must be used. Solder is generally silk solder or pure tin, and common agents include rosin, solder paste, etc.
Notes
Before use, check whether the power cord is good and whether it is burned.
When welding electronic components (especially integrated blocks), safety measures such as leakage prevention should be adopted.
When the solder head does not "eat tin" due to oxidation, do not burn hard.
When there is too much tin on the soldering head and it is inconvenient to solder, do not throw the tin; do not knock it.
When welding smaller components, the time should not be too long to avoid damage to the components or insulation due to heat.
After welding, you should remove the power plug and place the soldering iron on the metal bracket to prevent scalding or fire.
2. Line installation tool
is a tool used for line installation.
There are four types: round tenon chisel, small flat chisel, large flat chisel and long chisel.
(1) Round tenon (sǔn) chisel: As shown in the figure, it is used to chisel the wooden tenon holes of concrete structures.
(2) Small flat chisel: As shown in the figure b, it is used to chisel the wooden dove holes on brick walls.
(3) Large flat chisel: As shown in the figure c, it is used to chisel buried holes for angle steel brackets and brackets.
(4) Long chisel: In the figure, d is a round steel long chisel, which is used to chisel the through holes on concrete walls.
In the figure, e is a steel pipe long chisel, used to chisel through holes on brick walls.
When using wall hole chisel, you must constantly turn the chisel and often pull it off the building surface to allow the gray sand and stone chips in the hole to be discharged in time to avoid the chisel being blocked in the building.
It is a power tool that can be used as a "electric drill" or a "electric hammer". When using it, you only need to adjust to the corresponding gear.
(1) When speed and gear adjustment ("rush" and "hammer") should be performed under a stop. When drilling and drilling wall holes, a special impact drill bit should be selected according to the hole diameter. Impact drill bit
(2) During the drilling process, in order to eliminate soil chips in time, the drill bit should be pulled out frequently; when punching holes on steel bar buildings, excessive pressure should not be applied when encountering hard objects to avoid annealing of the drill bit.
is used to tighten the wires of indoor and outdoor insulator lines and outdoor overhead lines. When in use, the positioning hook must hook the wire bracket or crossbar. The wire clamping head must clamp the end of the wire that needs to be tightened, then pull the handle and tighten it gradually.
is used to peel off the insulating layer of plastic or rubber wires below 6mm2. There are multiple cutouts of different sizes in the clamp head to suit different specifications of wires. When in use, the wire must be placed on the cutout slightly larger than the diameter of the wire core to avoid damaging the wire core.
is used to tighten or loosen the bundle section or pipe nut on the wire tube. The method of use is the same as that of the movable wrench.
1. Adjust the appropriate spacing of the jaws to adapt to the diameter of the pipe to ensure that the jaws can clamp the pipe.
2. Generally, the left hand is held on the head of the jaw, and the right hand is pressed at the end of the pipe jaw handle as long as possible.
3, press down with your right hand to tighten (loosen).
is also called pedal, used to climb electric poles. The length of the rope should generally be kept long for one person and one hand. Both the pedal plate and the rope should be able to withstand weights of more than 300kg, and a load test should be conducted every six months. You must adopt the correct standing posture to maintain stability.
You can also use foot buckles to climb the pole. The climbing speed is faster and the method of climbing the pole is simple, but it is not as flexible and comfortable as the pedal during operation, and is easy to fatigue. It is suitable for short-term work on the pole.
When you use the rod to operate, you must wear protective caps, protective gloves, electrician insulated rubber shoes and electrician work clothes.
3. Equipment decoration tool
is a tool for electrical equipment maintenance or installation.
is commonly known as puller, divided into two types: double claws and three claws. It is a special tool for disassembling pulleys and bearings. When in use, each claw and the central screw should be kept at an equal distance.
is used to tighten or loosen counter hole nuts, or use it where the movable wrench cannot be used. It consists of two parts: sleeve and handle. The selection of sleeve should be suitable for the size of nut
commonly known as gourd, specially used for lifting heavier equipment, as shown in Figure 13. During lifting, if positioning is required at any time, or to prevent the equipment from rolling during lifting, combined pulleys should be used.
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