1、 Basic knowledge of strong electricity strong electricity, which is what we call wire
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The lamp line should be 1.5 square meters and above; the ordinary socket should be 2.5 square meters and above; the household air conditioner socket should be 4 square meters and above; the central air conditioner should be 6 square meters and above
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Wire is divided into single core wire and multi-core wire, that is, hard wire and flexible wire
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From the power on effect, the two effects are the same
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Theoretically, the surface area of the multi-core wire is larger than that of the single core wire, so the heat dissipation is good
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However, owners who use single core wires should not worry
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The safety still depends on the size of the wires
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From the construction point of view, the multi-core line is easy to construct, and most electricians will open the multi-core line
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2、 The design of the circuit is suggested to follow the following rules: a group of circuits for lighting, a group of circuits for ordinary socket, a group of circuits for kitchen, a group of circuits for toilet, a group of circuits for living room air conditioner, a group of circuits for bedroom air conditioner and a group of circuits for refrigerator
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Special attention: the refrigerator circuit is directly connected to the main switch incoming line
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When going out, the main gate is usually turned off, and the refrigerator is also powered off
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If you put something in the refrigerator, it will break down
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Make a separate circuit of the refrigerator and connect it to the incoming line of the main switch
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Even if the main switch is turned off, the refrigerator circuit will not be cut off
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3、 The wire load table is 1.5 square meters —– after the construction of 220v2750 W, the safe wattage is 2200W — 2475w2.5 square meters —– after the construction of 220v4400w, the safe wattage is 3520w — 3960w4 square meters —– after the construction of 220v6600w, the safe wattage is 5280w — 5940w6 square meters —– after the construction of 220v11000w, the safe wattage is 8800w — 9900w When the electric power exceeds the load, the line begins to heat up, and the air expands to generate thrust, which pushes the switch down to achieve the function of protection
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Household air switch generally uses 1p and 2p specifications
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3P and 4P are mostly used for commercial and industrial power consumption, which is not discussed here
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1p, also known as single air switch, can only cut off the live wire, which is generally used in indoor lighting circuit; 2p air switch can cut off the live wire and zero wire at the same time, which is generally used in air conditioning circuit
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5、 The distance between strong and weak current is more than 30cm, and the cross part of strong and weak current is wrapped with tin foil
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Why? Because the current through will produce a magnetic field, magnetic field will interfere with weak current signal
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Wrapping it in tin foil can shield the external magnetic field
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Of course, if your home’s weak line has its own shielding function, you can ignore this point
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2
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Lock the cable sleeve into the bottom box
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What’s the use of this latch? If the cutting edge is too sharp, the edge may wear out the insulation layer outside the wire, resulting in the wire exposed, increasing the risk of leakage
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This risk can be avoided by locking and fastening the conduit sleeve
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3
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Wire joint treatment
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There are three ways to deal with wire joints: the most common way is to use pliers to tighten and then stick black tape
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If the screw is not tight enough, the connector will be loose in the later stage, and the connector will not be electrified
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The best way to handle the joint is to solder the wire joint
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Through soldering, the joint is connected as a whole
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Some high-end companies use terminals
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The principle of the terminal is to press the wire through the shrapnel inside the terminal
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There is also a problem
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If the quality of shrapnel is not good, the connector will not be electrified
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If you want to use terminals, it is recommended to use Wago brand
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4
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No yellow wax pipe is used for non bearing wall
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The master will slot in the wall before embedding the pipe, and seal the pipe with cement after embedding
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If you are wearing a conduit, the wire can be moved inside the conduit
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If it’s a yellow wax pipe, the wire can’t move in the yellow wax pipe after the cement is embedded
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In case an installation breaks the wire, it is impossible to replace the wire separately
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It is necessary to chisel the wall for maintenance to increase the maintenance cost
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5
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The line pipe is cold bent
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The principle is the same as yellow wax tube
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The cold bending process ensures that the wire can twitch inside the tube
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If there is a dead bend when bending, the wire will not be able to twitch
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Increase the maintenance cost in later period
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6
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For the clamp of wiring pipe, it is recommended to use riding card or U-shaped card
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These two kinds of clips have an advantage: there will be a gap between the line pipes
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When the tiles are laid, the mortar can penetrate into the gap, reducing the probability of hollowing in the later stage
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In this case, there is no gap between the conduit and the conduit, and the probability of later hollowing is higher
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