Environmental requirements for cable laying

Today's wire and cable are used to power transmission (magnetic) and can realize electromagnetic energy conversion, information, and wire products. Let's look at the wire and cable laying conditions.

1. The ambient temperature. Because the weather temperature is variable, the environment temperature at selected points on the ground, underground, such as indoor, and outdoor, take different values in different Settings. Parts directly buried laying underwater heat source equipment factory building tunnels, indoor cable tunnel, indoor cable conduit or outdoor Ming fu has no heat source as a sunshade equipment factory poor ventilation or mechanical ventilation of mechanical ventilation or buried deep in the well-ventilated ventilation will pick environmental temperature most Thermidor mean ground temperature and highest average water temperature most Thermidor Thermidor, plus 5 ℃, the highest temperature, average when the tunnel cable quantity is large, cable heat effects should also be accounting Thermidor day average maximum temperature.

2. Laying mode. Ming fu, dark apply, wear pipe laying, bridge laying, trough, different ways of laying, different cooling conditions.

3. Laying area. The ground, underground, water, cable trench, electrical shaft, etc.

4. Power cable and apply. Not only affect the cooling conditions, but many cable fevers also influence each other. 5, another medium pipeline. Such as hot water pipes, steam pipes, etc.

Cable actual allows carrying capacity.

In practical engineering, the fixed wiring system of each cable laying conditions are set, so it actually allows the carrying capacity and the table said traffic load variation, depending on the difference between the actual installation

conditions and table according to installation conditions.

Engineering correction factor "to" to fix conditions brought about by the different laying cables allows the change of carrying capacity. Typical correction coefficients are: temperature correction coefficient, and apply the correction coefficient, soil correction coefficient of heat resistance, etc. In essence, the correction coefficient is the correction of cooling conditions.