Chapter 3-3-13 Crossing or Going Nearby Special Structures and/or Places

Article 289. Crossing or Going Nearby Electric Railways

1. Place of arrangement

Overhead power lines with voltage up to1kV shall be arranged outside areas of touching power network including poles of the network.

2. Position

Overhead power lines with voltage up 1kVto shall be arranged above guys of touching power network.

3. Conductor

Conductors of overhead power lines with voltage up to1kV shall have cross-sectional area not less than that of the following conductors.

-Aluminum conductor with cross-sectional area of 35mm2.

-Aluminum conductor steel reinforced or copper conductor with cross-sectional area of 16mm2. Conductors and lightning conductors are prohibited to be connected at intersected span. Conductors of overhead power lines with voltage up to 1kV shall be installed on double insulators. 4. Pole

Poles of overhead power lines with voltage up to1kV shall be checked in fault condition which a conductor is broken.

5. Distance

In calculation of the distance between conductors and electric railways or electric tramcar ways, the sag of conductors shall be the maximum sag.

The distance between conductors of overhead power lines with voltage up1kVtoto guys and conductors of touching power network shall not be less than 1.5m.

6. Installation method

Overhead power lines with voltage up to1kV are prohibited to be installed atthe places where conductors of electric railways and electric tramways are hung by cross arms.

Article 290. Crossing or Going Nearby Railways

1. Crossing angles

Crossing angle between overhead power line with voltage exceeding 1kV and the railway shall not be less than 40 degrees, and is preferable to be close to 90 degrees.

148

2. Pole

Anchor poles with double insulators shall be used at the intersection where overhead power lines with voltage exceeding 1kV cross railways and electric railways.

Support poles are permitted to be added at intersected span between anchor poles where overhead power lines with voltage exceeding 1kV cross many railways where trains with passengers rarely pass through.

It is permitted to use support poles whichconductors are fixed by fixed support locks for overhead power lines with voltage exceeding 1kV cross dedicated railways.

3. Foundation

Reinforced concrete poles and steel poles are prohibited to be used as grounding means. 4. Conductor

Conductors of overhead power lines with voltage exceeding1kV shall have cross-sectional area not less than that of the following conductors.

-Aluminum conductor with cross-sectional area of 70mm2.

-Aluminum conductor steel reinforcedand aluminum alloy conductor steel reinforced withcrosssectional area of 35mm2.

Conductors and lightning conductors of overhead power lines with voltage exceeding1kV are prohibited to be connected in intersected span.

5. Distances to trees along railway

The distance between theconductor of overhead power lines with voltage exceeding1kV and trees along railway shall comply with the requirements in article268 in Technical RegulationVol.1 and this Guideline.

Article 291. Distances to Railways

1. Pole

Poles are permitted to be attached guys in narrow places.

2. Distance from the conductor of overhead power lines to the rail surface or the boundary of safety corridor of the railway and electric railway

In the calculation of the distance from the conductor of overhead power lines to the rail surface or the boundary of safety corridor of the railways and electric railways, the sag of the conductor in normal condition shall be determined at the maximum air temperature in consideration of the heat due to electricity current. If there is no data of the load ofoverhead power lines, the maximum temperature, 70°C, shall be applied.

The sag of the conductor in fault condition shall be determined at annual mean temperatureand wind speed of 0 m/s.

149

When overhead power lines cross or go nearby communication and signal lines along the railways, they shall comply with the requirement not only this article but also 280articlein Technical RegulationVol.1 and this Guideline.

Article 292. Crossing or Going Nearby Car Roads

1. Pole

Overhead power lines with voltage exceeding 1kV shall be installed on anchor poles, when they cross car roads class I (refer to Table 293 in Technical Regulation Vol.1).

Overhead power lines with voltage exceeding1kV are permitted to be installed on support poles, where they cross car roads at class from II to V (refer to Table 293 in Technical Regulation Vol.1).

2. Conductor and insulator

Insulators shall be double installed in intersected spans with car road class I.

At intersection with car road from II to V, conductors on support poles shall be fixed byfixed support locks, and post-type insulators shall be double installed, if they are used.

Conductors at intersection with car road of class I and II shall have cross-ectional area not less than that of the following conductors.

-Aluminum conductor with cross-sectional area of 70mm2.

-Aluminum conductor steel reinforced or aluminum alloy conductor steel reinforced with -cross sectional area of 35mm2.

Conductors with cross-sectional area less than240mm2 and lightning conductors of overhead power lines are prohibited to be connected at intersected span with car roads of class I and II but conductors with cross-sectional area not less than240mm2 are permitted to be connected at only one point in the span.

3. Cross angle

The cross angle between overhead power line with voltage exceeding1kV and car road is not stipulated.

Article 293. Distances to Car Roads

In the calculation of distance between overhead power lines with voltage exceeding1kV to car roads,

the maximum sag of the conductor in normal condition shall be determined at the maximum temperature without the heat due to electricity current. The sag of theconductor in fault condition

shall be determined at annual mean temperature and wind speed of 0m/s.

Article 294. Going Through Bridges

1. Pole

Overhead power lines with voltage exceeding1kV which cross bridges and bascule parts of bridges shall be installed on anchor poles or anchor structures,.

2. Insulator

Conductors of overhead power lines with voltage exceeding1kV shall be fixed by double insulators and fixed support locks,and other support parts are permitted to be used with intermediate support structures.

3. Installation situation

As for metal bridge for railways with car roads below, conductors of overhead power lines with voltage exceeding 1kV are permitted to be installed directly on upper spans or outside of bridge frames, if the base is equipped for the whole length of the bridge on the top.

Overhead power lines with voltage exceeding 1kV on the bridge in cities or above roads are permitted to be installed outside bridge structures as well as within the width of pedestrian parts and road parts for vehicles.

Article 295. Distances to Bridges

In the calculation of the distance between overhead power lines with voltage exceeding1kV and parts of the bridge, the sag of conductors shall be determined at the maximum temperature.

Article 296. Traversing Dams and/or Dikes

In the calculation of the distance between overhead power lines with voltage exceeding1kV and parts of the dike or the dam, the sag of conductors shall be determined at the maximum temperature.

The minimum horizontal distance between the foundation of poles and the base of dikes shall comply with current legislations for protection of dikes

Article 297. Distances from Poles to Important Water Dams

Poles of overhead power lineswith voltage exceeding 1kV are permitted to be installed within safety corridor of dikes or dams, if the management agency of the dikes or the dams agrees with the installation.

151

Article 298. Crossing or Going Nearby Aerial Transport Cable Lines and/or Pipelines

1. Overhead power line with voltage up to 1kV

(1) Position

Overhead power lines shall be arranged under aerial transport cable lines.

(2) Protective measure

The safe range ofthe cable-air transport or overhead cable transport shall be determined to ensure a safe distance prescribed in this article of Vol.1 in Technical Regulation.

Metal pipelines above the ground and metal structures of aerial transport cable lines shall be grounded with ground resistance in compliance with the requirement articlein 555 of Vol.1 in Technical Regulation and this Guideline.

2. Overhead power lines with voltage exceeding 1kV

(1) Pole

Overhead power lines with voltage exceeding1kV, which cross aerial transport cable lines and pipelines above the ground, shall be installed on anchor poles.

If cross-sectional area of conductors of overhead power lines with voltage exceeding1kV is not less than 120mm2, support poles are permitted to be used at intersection with aerial transport cable lines and pipelines above the ground.

Poles are prohibited to be equipped with protective nets.

(2) Conductor and insulator

Conductors at intersection with aerial transpor cable lines and pipelines above the ground shall have cross-sectional area not less than that of the following conductors.

-Aluminum conductor with cross-sectional area of 70mm2.

-Aluminum conductor steel reinforced or aluminum alloy conductor steel reinforced with -cross sectional area of 35mm2.

Conductors with cross-sectional area less than240mm2 and lightning conductors of overhead power lines are prohibited to be connected at intersected span with aerial transport cable lines and pipelines above the ground but conductors with cross-sectional area not less than240mm2 are permitted to be connected at only one point in the span.

Conductors with suspension-type insulators on poles at intersection shall be fixed by fixed support locks.

Post-type insulators on poles at intersection shall be double installed.

(3) Protective measure

Protective fences shall be installed at the intersection where overhead power lines with voltage of 500kV cross aerial transport cable lines and pipelines above the ground. The fence shall be installed at

the point where is the maximum swing of the outer edge conductors plus 6.5m away.

152

(4) Position

The cross angle between overhead power lines with voltage exceeding1kV and aerial transport cable lines or pipelines above the ground are not stipulated.

Overhead power lines with voltage exceeding 1kV shall be arranged above aerial transport cable lines and pipelines above the ground.

If overhead power lines with voltage up to110kV are equipped with protective bridges or nets, the lines are permitted to be arranged under aerial transport cable lines and pipelines above the ground.

(5) Distance from overhead power lines to aerial transport cable lines and pipelines above the ground

In the calculation of horizontal distance (refer to bleTa 298) from overhead power lines to aerial transport cable lines and pipelines above the ground, the maximum swing of conductors in normal condition shall be taken into account.

In the calculation of vertical distance (refer to Table 298 in technical regulation) from overhead power lines to aerial transport cable lines and pipelines above the ground, the maximum sag of conductors in normal condition shall be taken into account.

Article 299. Distances to Gas or Oil Pipeline and Petroleum Products

Overhead power lines with voltage more than 1kV which cross or go near the gasor oil pipelines and petroleum products shall ensure the safety distance according to the regulations for oil and gas project.

Article 300. Crossing or Going Nearby Underground Pipelines

1. Cross angle

The cross angle between overhead power lines with voltage up to 35kV and underground pipelines are not stipulated.

The cross angle between overhead power lines with voltage not less 110kVthan and gas, oil, petroleum product pipelines shall not be less than 60 degrees.

2. Distance between overhead power lines with voltage of 500kV and gas flashing cocks

The distance between overhead power lines with voltage of 500kV and gas flashing cocks shall not be less than 60m.

3. Distance between overhead power lines with voltage of 500kV and water pipelines, etc.

When overhead power lines with voltage 500kVof cross or go nearby water pipelines, water discharge systems, or water drainage systems, the distance from the nearest ground systems and foundations of poles of the lines to water pipelines, etc. shall not be less than 3m.

Article 301. Crossing or Going Nearby Pressured Pipelines

1. Installation location

Main steam, petroleum product pipelines with the pressure more than 1.2MPa shall not be installed within safety corridor of overhead power lines with voltage exceeding 1kV.

2. Welded joint

153

Welded joints of main steam, oil,petroleum product pipelines with the pressure more than 1.2MPa shall be checked byphysical method, which are installed within safety corridor of overhead power liens with voltage exceeding 1kV.

Article 302. Going Nearby Structures containing Explosives and/or Flammable Substance

Overhead power lines with voltage exceeding1kV which go nearby structures containing explosive and flammable substances shall comply with standards and norms forsafety protection against fires and/or explosions, and the distance between the lines and structures which are not stipulated by the standards, etc. shall not be less than 60m.

Article 303. Going Nearby Oil and/or Gas Flames

Overhead power lines with voltageexceeding 1kV going nearby oil and gas flamesshall secure the distance from the flames stipulated in this article in Technical RegulationVol.1.

Article 304. Going Nearby Airports

Overhead power lines with voltage exceeding1kV going nearby airports shall be approved as shown in this article in Technical RegulationVol.1.

154