Circuit transformation is a link that every family must do when it is renovated. However, most people are far less familiar with the circuit transformation, and there are far fewer other links. Many construction workers are aware of the weak knowledge of the user in the circuit transformation process, often cutting corners, doing less or not doing during the construction process. The following summarizes the points that are prone to problems during the circuit transformation process, and I hope to help everyone.
First, bare wire buried wall
Bare wire buried wall
"GB50327-2001" clearly states that all wires must be threaded through the conduit and must not be exposed to the air or directly in contact with the wall. This stipulates that on the one hand, it is to prevent electric leakage of electric wires and to electrify the wall; the second aspect is to facilitate the replacement of electric wires during future maintenance; the third aspect is to provide heat dissipation space for the electric wires.
There are two main problems here:
1. Inside the ceiling – the national standard clearly mentions that the wires in the ceiling must be piped.
2. The wire must be used for the surface-mounted wire - of course, but the aesthetics are not considered, and the threading pipe can be used.
Second, the tube overload
Too many wires inside the tube
The cross-sectional area of ​​all wires in the threading pipe (including the wire insulation layer) shall not exceed 40% of the cross-sectional area of ​​the internal space of the wire pipe, mainly due to the consideration of heat dissipation of the wire. Take the usual 16-wire tube as an example. You can pass 6 or 4 square wires of 2.5 square wires – of course, the current industry standard is 3 wires in each pipe – even using thicker threading pipes. In any case, the minimum standard is 40% space.
Third, "co-management"
It means that strong and weak electricity cannot penetrate into the same threading pipe - not only that, but also between the strong electric threading pipe and the weak electric threading pipe, the distance should be 30cm.
Wires in the same circuit (in a single-phase circuit, the same circuit has a maximum of 3 wires) must be routed from a conduit. If the line of the wire increases, consider increasing the diameter of the threaded pipe instead of separating each wire.
Fourth, "total slot"
Water pipes, gas pipes, strong electric pipes, and weak electric pipes cannot be grooved with each other and must be laid separately.
Five, no pass box
Many people have never heard of the "passing box", but this thing has definitely been seen by everyone â–¼
There are two cases in which the junction box cover is installed: 1. the cable box; 2. the connector box - they are collectively referred to as the "passing box", that is, there is no switch socket installed on the junction box, and only the wires are inside.
The cable box refers to the length of the wire laid more than 15m, at this time to add a junction box at 15m (or less than 15m). Its role is still reflected in the name - in order to install or repair, the side draws the wire.
The connector box means that only the wire connector in the junction box - all wire connectors must be made in the junction box. If there is no switch socket installed at the junction box, a separate connector box needs to be reserved.
All pass boxes cannot be enclosed in the wall and are covered with a junction box cover. In order to facilitate inspection during maintenance.
Six, barbaric slotting
Savage slotting is the most obvious manifestation of unprofessional construction personnel. Before slotting, the direction and distance of slotting should be drawn on the spot in advance, and the width should be the same as the diameter of the threading pipe. When slotting, it should be accurately marked according to the site marking to ensure the same depth and accurate direction.
In addition, special attention should be paid to the fact that the load-bearing wall is not allowed to be punched, and it should be avoided to slot the load-bearing wall as much as possible - individual unavoidable trunking, and also the depth of the groove.
Seven, the wire exposed
In the first point of the article, it has been said that the wires are not exposed - they must be worn. However, in the handling of details, it is often not ideal. The most obvious place is where the conduit and the junction box meet, which can easily lead to poor connections, causing some of the wires to be exposed directly to the air.
Red, green xian conductor exposed
If the conduit and junction box are not properly connected, consider purchasing a special accessory for an auxiliary connection. Be sure to pay attention to the situation that the threading pipe falls from the junction box during the construction process.
Eight, undivided color
The line colors of the zero line, the fire line, and the ground line in the family must be distinguished, and the line colors must be uniform—the lines of each attribute use only one color.
The national standard specifies the color of the neutral line used in the decoration - the color of the blue and ground lines - yellow and green, and there is no regulation on the color of the fire line. However, in the decoration industry, the red connection fire line is often used - in "GB7947-2006", it is mentioned that in single-phase circuits, black, brown, green or yellow can also be used to indicate the fire line.