In the horizontal subsystem of the integrated cabling system, the total length of the cable from the information outlet to the patch panel can not exceed () meters, can you tell the reason?
current I1; bad arc length of l current I2 Because the superior arc and inferior arc voltage equal, so I1R1 = I2R2 iron ring thickness uniformity, so the resistance is proportional to the length, so I1l1 = I2l2 ① excellent arc current O point in the direction of the magnetic field perpendicular to the paper inward R is the radius of the ring, and the magnitude of the magnetic induction produced by the current at the O point is the same The magnitude of the magnetic induction intensity at the O point is perpendicular to the paper O point of the total magnetic induction of ② ② ① type into the type of B = 0
The trough bridge is sealed, with a rectangular or square cross-section, with a cover plate, plastic and metal. Generally used for fire, moisture, dust, anti-interference, anti-mechanical damage and other places. Ladder bridge like ladder-like open, easy to heat, are used for more cable, high temperature requirements of the place.
Engage in what, put on the wallpaper does not become a dark line yet. Ming line is very practical. Or you shop in the ground or hidden in the base line it
