Most of the galvanized iron pipes embedded in the concealed line building are over the beam, because the pipe is limited, it is inevitable that the interface can be cemented in the cement slurry will follow the interface gap into the lumen, causing clogging, dead, sometimes Will flow into the junction box, causing clogging, dead box, what way? More
. DC single-core cable to wear galvanized steel, single-core cable to send the DC signal is not affected. . if it is galvanized steel plate composed of electromagnetic shielding space, then single-core cable to wear galvanized steel, the electromagnetic shielding performance is destroyed.
Oh, I stayed at the site for a long time, but this kind of thing really little ah really afraid of it, may wish to pour in the time, to the mouth of a place to add a layer of protection on the line
In the DC line, the single-core cable can be used to wear steel pipe alone, but in the AC line, single-core cable can not wear steel pipe alone. This is because the AC current flows through the wire, the wire will produce alternating magnetic field around, Under the influence of the magnetic field, the internal will produce eddy current, then the steel pipe will heat.Especially in the case of high current transmission line, the pipe heat will be very serious, easy to cause line accidents, so the line construction in the ban single-core AC cable alone The same reason, the transformer core to use the surface of the insulating layer of silicon steel sheet stacked, and can not use the whole piece of iron, which is commonly referred to as the reduction of iron loss.
DC single-core cable can not use magnetic armor the same reason, should avoid single-core cable alone wear pipe and the use of closed ferromagnetic material cable clamp and so on. Single-core steel armored power cable in the use of the existence of a large limitation, the structure is also unreasonable, so the DC single-core cable can wear galvanized steel pipe.
