The cross - sectional area ratio of the cable to the embedded tube
I am the measurement staff, the above answer is not right First of all, for household electricity is generally single-phase power that 220V this, red for the line of fire or green or black, can be connected to the refrigerator, washing machine and other plug Three, the red for the line of fire, green for the zero line, black for the ground line (if you do not understand what is the ground wire, then I will be able to say) Second, some home air conditioning with three-phase power that 380V, this time Yellow for the A phase, green for the B phase, red for the C phase, the neutral line is not grounded purple, ground is black if different views, welcome to discuss, thank you
Hello, the power cable is used to transmit and distribute power cable, power cables commonly used in urban underground power grid, power station leads lines, industrial and mining enterprises within the power supply and across the river water transmission line
The concealed wire is realized by embedding the wire tube. When the decoration, the electrician master will be in the wall excavation wall, and then the wire tube (including the junction box) fixed in the wall, the depth of the wall as the thickness of the wire tube to determine. In general, the depth of the wall after the wire tube is fixed, the surface to the wall of the distance of about 10mm is appropriate, and then fill the formation of cement mortar. According to the specification, the direction of the wire tube should be horizontal and vertical, each connector should be applied pvc glue.
The power cable is a cable product used to transmit and distribute high-power power in the main line of the power system, including various voltage classes of 1-500 kV and above, and various insulated power cables In order to identify the performance and quality of the power cable to ensure the normal operation of the various tests carried out, the following is a common power cable to prevent the pilot project, cycle and requirements: Table 1: Insulation resistance (test equipment: BC2000 intelligent double significant insulation resistance tester ) The cycle requirements are specified in the DC voltage test before the self-specified voltage of 06 / 1kV cable with 1000V megger; 06 / 1kV cable with 2500 megohm (6 / 6kV and above cable can also be used 5000V megger) table 2) DC voltage test (test equipment: ZGF series of DC high voltage generator) cycle requirements Description 1) 1 to 3 years 2) new terminal or connector after 1) test voltage according to the following table, the pressure time 5min, not The leakage current of the cable 6 / 6kV and below is less than 10μA The leakage current of the 87 / 10kV cable is less than 20μA The rated voltage is not specified Rated voltage Uo / U (kV) Viscous oil paper Insulation test voltage kV No drip Oilpaper Insulation Test voltage kV06 / 14418 / 312--36 / 624--6 / 630--6 / 1040--87 // - 26 / - (test equipment: BPXZ series resonance) cycle requirements 1) overhaul new work Terminal or connector 2 ) Required voltage level Recommended frequency 20Hz ~ 300Hz Resonance withstand voltage test, test voltage and time are as follows: 1) No test conditions can be used to apply the normal system relative to the voltage 24 hours instead of 2) If necessary, such as: doubt Cable failure voltage level test voltage time 35kV and below 16UO60min110kV136UO60min220kV ~ and above 112UO60min
