Indoor explosion - proof cable well embedded casing height
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. the bridge within the line can not wear steel pipe, of course, the bridge is also allowed to wear a line of steel pipe installation, the bridge can be empty according to the number of cable design volume, when the line a lot of large bridge should be the main line, Its branch into the equipment or into the pipeline can be flexible access through the steel pipe.
Power cables do not need to add cable protection tube, depending on the cable laying, armored cable generally do not need. If underground submerged, through the road, from the overhead line connecting cable into the underground or mechanical easy to reach the part of the general need to protect the tube, usually in the cable trench or cable tunnel laying cable does not require cable protection tube. In short, whether it is armored or non-armored cable installation and installation do not need to install protective tube, usually depends on whether the cable laying environment is vulnerable to external mechanical damage as a criterion, may be damaged by external mechanical Need to install, not vulnerable to external mechanical damage is not necessary, not stereotyped.
PVC pipe must be changed for a treatment, the line has been seriously damaged, the first epidermal damage, which is destroyed the insulation value, a power is very easy to trip. And then inside the copper is also damaged, but the load is easy to short-circuit, short-circuit burning. For example, a pole, the above has been broken, if the pick in the heavy, that is facing the break.