2.
(in the photo, 4mm2 conductor strands are used for more jumper connections.
The color of the phase line conductors connected to the air switch is yellow.
Because the box is supplied by Party A, it can be replaced with the same model of standby switch in the box.
Tinning shall be carried out when the socket is connected.
This may lead to insufficient contact area, which may easily lead to excessive heat generation at the busbar and terminal and burn the terminal.
Use a special connector to connect the metal hose to the lamp.
Do not leave a gap when connecting the lamp strip, otherwise it will leave a dark shadow.
There are problems: 1 Use three 1p air switches instead of one 3P air switch as the three-phase air conditioning switch.
The grid lamp needs to increase the capacitance.
The conduit is of different lengths, and the sectional area of the busbar that does not enter the vertical bridge is far smaller than the sectional area of the terminal.
Use a metal hose to install the lamp through the deformation seam.
generally, when the 2.5mm2 conductor is used, the number of jumper air switches shall not exceed three.
It needs to be replaced.
2.
there is a problem with the joint in the pipe 1 The busbar terminal block does not match the conductor.
The joint is only wrapped with a layer of waterproof adhesive tape, but not wrapped with insulating adhesive tape..
The primary side conductors of the distribution box are not separated by a-yellow, b-green, c-red, zero line blue and ground line two colors.
Pay attention to the official account (id:mepbbs) of electromechanical world politely, and the dialog box reply: pay attention, 1 Send word version of electromechanical installation disclosure; 2.
The sundries on the air switch in the box are not cleaned up when the Yellow conductor is used as the ground wire (the specification specifies that the ground wire is a two-color wire).
How to do a good job in the construction management of construction and installation projects according to the current development situation is an urgent problem for construction managers at all levels.
1.
the main incoming line (installed by Party A) is aluminum wire.
Jumper neutral lines shall be added between two zero line rows to ensure that the conductor ampacity can meet the use.
If the end zero line is burnt out, all jumper circuits will be powered off) The secondary side outgoing line of the distribution box is marked with labels to facilitate maintenance.
The primary side of the local air switch on the first floor is burnt out (cause analysis: the terminal is burnt out due to the loose crimping of the conductor).
Rows of conduits are arranged together.
At the elbow, there is no hanging bar to lift the grounding connecting pipe made by weak current discipline.
The purpose is to improve the power factor and reduce the waste of electric energy.
Please ask the procurement department to replace it, and pay attention to the reasonable busbar for the main incoming line in the process of future delivery.
Iron sheet is used to cover the wire passing groove on the ground, and some weak current lines are not protected through pipes.
As a result, the main neutral line cannot be installed normally on site.
Pay attention to the position where the glove hose is not firmly connected when installing the lamp, resulting in the falling off of the phase line connection at the pipe joint (the two hole socket facing the left side of the socket is the zero line, the right side is the phase line, the left side is the zero line, the right side is the phase line, and the upper side is the ground line) The upper and lower direction of the left socket is returned to the right with the correct yellow arrow.
according to specification 02, the flexible wire shall be tinned or terminals shall be used, and the primary side conductor shall be distinguished in color.
The conductor joints shall be tinned, and the joints shall be wrapped with two layers of adhesive tape, One layer of waterproof and one layer of insulating tape.
Now the switch has not been turned on; Terminals shall be used to crimp the zero line at the connection between the ground wire and the bus bar.
It is suggested that the project department negotiate with Party A to use copper aluminum transition wire nose for wire pressing or tinning.
During installation, the box must be fixed firmly.
Use a hole opener to open the incoming line hole.
The wiring hole of the ground wire bus bar is inconsistent with the incoming line.
The light partition wall junction box shall be fixed on the keel with a horizontal keel When anchoring the distribution box for installation, use a wooden keel with the same width to clamp the edge of the box to ensure that the box is parallel to the wall after installation.
The zero line does not use a zero line row, and the zero line in the box has a joint, which is not tinned.
The editor summarized the problems that are easy to occur in electrical construction, Read quickly ~ asphalt paint shall be used for anti-corrosion treatment at the welding position of buried equipotential flat iron and welded steel pipes.
To avoid the oxidation-reduction reaction of copper and aluminum is the oxidation of aluminum wire.
When using flexible cables, please conduct tinning treatment or use the phase lines at the primary side of the terminal block (wire nose) to distinguish different phase sequences according to a-yellow, b-green and c-red (the solution can be wrapped with color bands of different colors).
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It can be seen that the position of phase a air switch under the control of the main air switch is 1, 4, 7, 10, 13, 16, 19, 21, 24 and 27 calculated from the first row.
the air switch in the box shall be marked according to the requirements of the company.
Conductors with different cross-sectional areas are pressed at the same air switch terminal, resulting in loose crimping, which is easy to generate heat and burn the air switch.
outlet shall be provided at the side of distribution box.
However, the more jumper connections, the greater the chance of problems.
The zero line in the first row is jumper connected according to the switching sequence entering phase A.
When passing through the keel through the light partition wall, the hole shall be opened with a hole opener.
(arranged on site) electrical accident analysis: after turning on the switch of all the lights in the control store, all the lights flashed, and there was a smell of burning wires.
When fixing wire pipes, the spacing shall not be greater than 1.0m.
the main neutral line needs to be tinned or use wiring terminals.
After the carpet is laid on the wide, deep and uneven part of the groove, there will be unevenness when stepping on it, and the feeling of collapse and suspension.
2.
1.
The wiring hole of the bus bar with the main incoming line of 35mm2 can only be crimped with about 4mm2 of conductor.
The allowable deviation of perpendicularity is 1.5%o.
Galvanized steel pipes are strictly prohibited to use electric welding hanging bars.
2.
The following figure shows that the number of winding turns between the conductors at the inclined junction box of the distribution box after installation is not fixed firmly, resulting in 4-6 turns of winding.
After the wire is connected, insulation telemetry shall be carried out to ensure the safety of the line when installing the equipment and prevent the normal closing after installing the lamps or equipment.
The direct burial of the conductor will accelerate the aging of the conductor, and is not conducive to maintenance and replacement.
