8 Notices for Cable Laying
Cable insulation should be checked before laying cables, 6 ~ 10KV cable uses 2500V magneto-ohmmeter, telemetry insulation resistance ≥100MΩ; 3KV and below cable uses 1000V magneto-ohmmeter, telemetry insulation resistance ≥50MΩ, the suspected cable insulation should be taken withstand voltage test before laying confirm eligibility.
Threats and Cable Line Fault of Bare Conductor Overhead Cable
Bare Conductor Overhead Cable is outside; it will be affected by climate and environmental conditions. Lightning, fog, wind, rain, snow, heat, cold, flood, smoke and dust, fibers, etc. are from different aspects threaten to Bare Conductor Overhead Cables.
The differences between communication cable and optical fiber cable
Communication cable is usually made of a few or several groups of wires [each at least two] twisted together like rope cable, insulated from each other between each group wire, and often twisted around a center, there is the whole package outside highly insulating cover layer, especially a submarine cable.
5 measures to prevent electric cable insulation breakdown
electric cable insulation
4 Tips for Power Cable Laying Construction
When the power cable laying construction, measures must be taken so that the cable can not be formed closed loop around the steel (iron), prevent power cable causing eddy current.
How to choose right cross-section of low voltage overhead cable conductor?
When low voltage overhead cable conductor passes the maximum permissible continuous load current, conductor wire core heat does not exceed the allowable temperature.
Why flexible mine insulated fire resistant cable have good fire resistantance performance?
General wire and cable insulation due to the use of organic polymer materials are therefore highly carbonized under fire conditions and thus lose insulation. Flexible mine insulated fire resistantant cable main materials is mineral compounds, which in itself does not cause a fire, can not burn or support combustion. These materials generally have a higher melting point above 1500 ℃, so even for fire resistant cable under fire conditions can also play a normal transmission function, it is a real fire cable sense.
How to identify good quality cable or poor quality cable?
Seven methods to identify poor quality cable
Main characteristics of split-phase metal sheath power cables
Waterproof wire and cable research and development has been a problem in the main study, after many long and repeated experiments we can found that even if the insulating sheath is not broken, there will be some water or moisture seeped into the core of power cables. Thus, it is generally considered that improving three core waterproof cables to three single core waterproof cables structure is better when medium voltage power cables or low voltage power cables applied to real-life.
How to laying underground cable?
underground cable laying need to dig a trench depth of about 0.8m on the ground, trench width is 0.6m.