Table 189 Distance from conductors near the buildings to other subjects
Description of distance
- Distance from conductors to the ground in front of entrance o the buildings - Distance from conductors at inlet terminal to the buildings
- Distance between conductors on insulators at inlet terminals to the buildings
- Distance from conductors to the protruding parts (veranda, etc.)of the buildings
-Vertical distance from conductors of the branches to inlet terminals -Vertical distance from conductors at the branches to the roof of the buildings
- Distance from conductors of branches to inlet terminals of the house - Distance from conductors of inlet terminals to the roofs
*1Note: Inlet terminals through the roofs of buildings are permitted to be made of steel pipes.
*2Note: In case of conductors on roofs of low buildings and without people, and the distance from the conductors to ground surface shall not be less than 2.75m.
Article 190. Distance to Firefighting Roads
The distance shown in this article in Technical RegulationVol.1 shall be ensured for outside wirings not to obstruct the firefighting activities or the traffic of the firefighting cars.
Article 191. Installation in Pipes and Boxes
Metal pipes, boxes or hoses inserted in outside wirings shall comply with the requirements in article 180 and 183 in Technical RegulationVol.1 and this Guideline.
Chapter 3-1-4 House and Outside Wirings with Voltages above 1kV up to 35kV
Article 192. Installation Height
The height shown in thisarticle in Technical RegulationVol.1 shall be secured for house and outside wirings installed in production halls and electrical halls.
Article 193. Lightning Protection for Outside Wirings
Outside wirings shall comply with the requirements for protections against lightning in article99 in Technical RegulationVol.1.
Article 194. Installation in Tunnels and Corridors
House and outside wirings installed in tunnels and corridors shall be installed in consideration of the following requirements.
1.Requirement for minimum gap
Article 345 in Technical RegulationVol.1 and this Guideline shall be referred for the requirement for minimum gap.
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2.Requirement for working corridor
The width of working corridors of house and wirings shall be ensuredthe values shown inthe following table.
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Table 194 |
Minimum width of working corridor |
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Length of the wiring |
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Arrangement of the wiring in working corridor |
Minimum width |
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(m) |
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(m) |
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150 and less |
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The wirings arrange at one side of working corridor |
1.0 |
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The wirings arrange at both sides of working corridor |
1.2 |
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Exceeding 150 |
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The wirings arrange at one side of working corridor |
1.2 |
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The wirings arrange at both sides of working corridor |
1.4 |
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3.Requirement for barricade
The height of the barricades shall comply with the requirements in this article in Technical RegulationVol.1.
4.Requirement for Earthing
Fixed earthing system or structures for portablearthing system shall be arranged at the both edges and intermediate points of house andoutside wirings. The number of intermediate points shall be selected so that the induced voltage between twoadjacent points for earthing does not exceed 250V in the event of short circuit.
5.Requirement for lighting system
Lighting systems in tunnels and corridors shall be supplied with electricity from two sources. Lamps from each source shall be arranged alternately.
In tunnels and corridors where house and outside wirings without sheathes are installed, lighting system shall haveprotective covers (e.g. corridors in steel pipes) to ensure the safety for maintenance.
6.Requirement for ventilation
Ventilations shall be performed so that the differencof ambienttemperature between inside tunnels or corridors and outside does not exceeds 15°C.Vents of the ventilations shall be equipped with shutter, guard nets or protective shields.
7.Requirement for other structures
Structures for arrangement of thewirings shall be made of flame-resistant materials. Reinforced concrete construction structures shall have flame-resistant rate not less than 0.75 hours, and steel pipes shall have flame withstand time not less than 0.25 hours.
Any pipes are prohibited to cross each other.
Communication equipment shall be installed in tunnels and corridors. Means and places for communication shall be determined by the special design.
Article 195. Installation of Soft Outside Wirings
Soft outside wirings shall be installed to complyh witrequirements in this article in Technical RegulationVol.1.
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