Warning: junction box no electrified operation, must be reliable power and ensure no residual voltage after operation.
Cable installation work must be strict implementation of the installation process, in the underground. The installation process is as follows:
1 check before installation cable type, specification and installation of wiring box line, and prepare a variety of equipment. All equipment must be kept clean, especially its are pieces of insulation.
2 the pressure plate, sealing ring, sealing ring, Unicom section sequentially sheathed cable. At the end of the cable is 380mm length strip the cable sheath and a sheath to prison sight outside the semiconductor layer. Release the left monitor wire, and compiled braid sub unit, and on top of it and then set on the insulating tube. Insulating tube to sleeve braid strands to root, an insulating tube and the other end should expose the 30mm long.
3 use rasps, rubber, carbon tetrachloride solvent to remove the monitoring line below the inner protective sleeve length of root surface 22mm semiconductor adhesive residue, 22mm outside the inner sheath root surface 22mm length semiconductor adhesive residue, 22mm outside the inner sheath all stripped, and type J-20 butyl adhesive tape ( hereinafter referred to as the self-adhesive tape ) 22mm length the inner sheath encases 2 layer in.
4 inner sheath below the ground release and braided strands, and then put on the insulating tube, and expose the 30mm long.
5 stripped the three main core wire insulation layer, a length of 30 mm, expose and emery cloth clean
6 stripped of three main core wire insulating layer outside of the semiconductor layer, and rasps,
Rubber, carbon tetrachloride carefully wipe the semiconductor adhesive residue.
7 2500V.500V ohm meter, measurement of the main core resistance and grounding and monitoring of line of sight between the insulation resistance, shall comply with MT818 standards
8 the other one end of the cable is completed after the procedure, respectively, two electric cable core wires are respectively connected with three main wiring ceramic base terminal, grounding line pressure to the earthing bolts, and press.
The 9 platen is arranged in Unicom Festival, Unicom section installed on the shell, plate is arranged in a pressing plate and compression cable.
The 10 outer ground should be reliable and underground grounding connection. When installing outlet part rubber seal cannot be suppressed too tight, so as to avoid the core wire deformation, influence of insulation. Junction box for inspection and cable at the same time, if the temperature is higher than 80 DEG C, should study the reasons, timely solution. Check check, to view the fastener, warning signs and whether the integrity.