(4) When flame-resistant pipes and boxes are closely installed in closed compartments empty space in construction structures (e.g. the space between wall and covering layer) or in closed canals etc., non-flammable solid layers with thickness of 10mm and more shall be placed between all sides of the pipes or the cables and surface of structures or flammable parts.

(5)House and outside wirings crossing in theshort section at flammable parts of the construction structures shall comply with the requirements specified item (1) and (2) 4) in this article.

Article 175. Arrangement of Switching Devices and Protective Devices

Switching and protective devices shall comply with the requirement of Part 5 in Technical RegulationVol.1 and this Guideline.

Article 176. Safety Warning Plates

Safety warning plates shall be installed as below.

-Installed location: at the intersection of car roads in urban areas.

-Installed places: hanging on the conductor at intersection.

Chapter 3-1-2 House Wirings with Voltage up to 1kV

Article 177. Prevention against Contact

1.Height of conductor without protective cover

-The minimum height of conductor without protective cover in less dangerous and dangerous halls

- The minimum height of conductor without protective cover in production halls stipulated in Table 177 in Technical RegulationVol.1 shall be applied to conductors in the sections connected to switches, sockets, electrical equipment, electrical boards, etc.

-In utility halls of industrial enterprises and domestic houses, theconductors without protection against mechanical impacts are permitted to be used in the above-mentioned sections.

- In halls which only trained staff can access, the height for installation of opened insulated conductors without protective covets is not stipulated.

-The minimum height ofconductor without protective cover at platform of crane car stipulated in Table 177 in Technical RegulationVol.1 shall be applied to conductors without protective covers. If the floor of crane is higher than the platform, the height from the floor to conductors shall comply with the value in Table 177 in Technical RegulationVol.1

-If the height in platform of crane car is not secured, protective means to avoid inadvertent contact shall be applied for the conductors. Protective means shall be installed on ntiretheelength of conductors or crane in the section installed the conductors.

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2.Height of conductor with protective cover

The height of the following conductors is not stipulated.

-Conductors and cables with protective covers.

-Conductors and cables inserted in pipes and boxes not less than IP20 or in flexible metallic hoses.

3.Particular requirement

(1)In industrial halls, the height of house wirings with protection class of IP00 shall not be less than 3.5m and the height of house wirings with protection class not lessthan IP31 shall not be less than 2.5m.

(2)The height of house wirings with insulated conductor with protection class not less than IP20 and house wirings with protection class not less than IP40 are notstipulated. The height of house wirings with AC voltage up to 42V and DC voltage up to 110V are not stipulated.

(3)In private halls (e.g. technical infrastructures of buildings) where onlyspecialized staffs can access, the height of house wirings with protection class not less than IP20.

(4)In electrical halls of industrial enterprises, the height of house wirings with protection class not less than IP00 are not stipulated. In the places where house wirings withprotection class of IP00 might be contacted by persons, barriers for protecting inadvertent contact shall be arranged.

(5)In the places where house wirings might be affected by mechanical damage, the protection shall be enhanced for the wirings.

(6)House wirings and barriers above the paths shall be installed at the height not lessthan 1.9m from the floors or working platforms.

(7)Auxiliary requirements are shown as below.

-The barrier nets of house wirings shall have the mesh not larger than 25mm square.

-The structures above house wirings shall be made of flameresistantmaterials with flame withstand time not less than 0.25 hours.

-In the section where house wirings go through the roofs, wattles and walls, measures shall be provided for the wirings to avoid the fire and smoke from going from a hall to another hall.

Article 178. Conductors without Protective Covers

The distance from opened conductors without protective covers to crossing other conductors shall not be less than 10mm at intersection. In the cases that such distance is not secured, insulation layers shall be added on all conductors without protective covers

Article 179. Crossing with and Installation in Parallel Pipes

When house wirings cross or go nearby pipes, the wirings shall comply with the requirement in this article in Technical RegulationVol.1.

Article 180. Condition for Traversing Walls and Floors

1. Requirement for opened house wiring

(1)The section where opened house wirings go through walls or floors shall be in the form of pipes, boxes or holes etc.

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(2) The slots between opened conductors or cables and pipes, boxes or holes (including reserve ones) shall be tightly sealed withnon-flammable materials for preventing water penetration, accumulating and flowing intoor going out through holes of walls or floors. The tight sealing means that thereplacement or addition of conductors, andcables can be implemented. eatH withstand limitation of through-hole shall not be lower than that of walls or floors.

(3) Metal pipes, boxes and hoses inserted in opened house wirings shall be installed not to accumulate moisture.

2. Requirement for closed house wiring

Metal pipes, boxes and hoses inserted in closed house wirings shall comply with the requirements in item 1 (3) of this article as well as in article183in Technical RegulationVol.1 and this Guideline. Besides, metal pipes, etc. shall be tightly sealed (Refer to item 1 (2) in this article) and be used with boxes of one-piece from.

Article 181. Installation in Dry and Humid Halls

Opened house wirings shall be installed in consideration of situation of halls and comply with the requirements in this article in Technical RegulationVol.1.

Also, cable pipes shall comply with requirements in article179 to 183 in Technical RegulationVol.1 and this Guideline.

Article 182. Limitation for Conductors and Cables Installed in Bundles

In the troughs, surface of supports, suspension wires, supporting bars or other supporting structures, conductors and cables with different forms (e.g. round or rectangular multiple layers) are permitted to be installed in the bundles (groups).

Conductors and cables in each bundle shall be tightened together.

Conductors and cables in form of multiple layers are permitted to be installed in a box regardless of the position.

Cross-sectional area of all conductors and cables counted by external diameters including the insulations and the sheaths shall notbe more than 35%of internal crosssectionalarea of a box without protective covers and 40% of internal cross-sectional area of a box with removable protective

covers.

Article 183. Connection of Pipes, Boxes and Hoses

In clean and dry halls without vapor and gasnegatively affecting the insulation and protective covers of conductors and cables, connectionparts of metal pipes, boxes and flexible metallic hosesare permitted not to be sealed.

The connection parts of pipes, boxes and flexible metallic hoses as well as enclosures of electrical equipment, etc. shall satisfy the following requirements.

- In halls withvapor and gas whichnegatively affect the insulation andprotective covers of conductors, outdoor and in places where grease, lubricant oil, water or emulsioncan penetrate to the pipes, boxes and flexible metallic hoses, the connection parts shall be sealed. In these cases, the boxes shall have closed walls and covers. If the boxes are not solid type, they must be sealed.

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The boxes which can be dismantledshall be sealed inthe place where they aredismantled. Connections of metal hoses shall be conducted in the form shuts the gas off.

-In dusty halls, connections of conductors and cables shallbe in form of sealed pipes, branch pipes, boxes and metal hoses to prevent them from the dusts.

Article 184. Prohibition of Installation inVentilation

Installation of closed house wirings at tunnels and channels shall comply with the requirements in this article in Technical RegulationVol.1.

Article 185. Installation in Roofed Halls

Installation of house wirings in roofed halls shall comply with the requirements in this article in Technical RegulationVol.1.

Article 186. Conductors in Roofed Halls

Conductors and cables of house wirings in roofed halls shall comply with the requirements in this article in Technical RegulationVol.1.

Article 187. Connections and Branches in Roofed Halls

Connections and branches of house wirings in roofed halls shall comply with the requirements in this article in Technical RegulationVol.1.

Article 188. Switching Devices in Roofed Halls

Switching devices in roofed halls shall comply with the requirements in this artincleTechnical RegulationVol.1.

Chapter 3-1-3 Outside Wirings with Voltage up to 1kV

Article 189. Requirements for Outside Wirings

1.Distance from conductor to support structure

The distance from conductors of outside wirings with voltage up to 1kV to support structures shall not be less than 50mm.

2.Supplement requirements for installation near building

-Inlet terminal through walls of the buildings shall be installed in insulated pipes which can protect the water from flowing into and pooling in the buildings.

-The distance fromconductors near the buildings to other subjects shall be ensured the values shown in the following table.

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