The specific requirements of this section apply to electrical installations in narrow conductive locations and the requirements for power supply of equipment in these locations. A narrow conductive location is a location that is mainly surrounded by metal or conductive bodies. People in such locations are likely to come into contact with surrounding metal bodies through a large area of ​​their body, and the possibility of preventing such contact is very small. GB 16895.8-2000 Electrical Installations in Buildings Part 7: Requirements for Special Installations or Locations Section 706: Narrow Conductive Locations GB16895.8-2000 Standard Download Decompression Password: www.bzxz.net

GB 16895. B—2000
This standard is a mandatory standard.
This standard is equivalent to IEC60364-7-706:1983 Electrical installations in buildings Part 7: Requirements for special installations or locations Section 706: Narrow conductive locations.
IEC60364 "Electrical Installations in Buildings" is divided into the following 7 parts under the general title: Part 1: Scope, purpose and basic principles Part 2: Definitions
Part 3: Evaluation of general characteristics
Part 4: Safety protection
Part 5: Selection and installation of electrical equipment Part 6, Inspection
Part 7: Requirements for special installations or locations This standard is equivalent to Section 706 of Part 7\Requirements for special installations or locations. This standard was proposed by the State Bureau of Machinery Industry. This standard is under the jurisdiction of the National Technical Committee for Standardization of Electrical Installations in Buildings. The responsible drafting unit of this standard: China Machinery and China Electric Design Institute. The main drafters of this standard: Feng Zongheng and He Xiangkun. This standard was first issued on October 17, 2000, GB16895.B2000
IEC Foreword
1) Formal resolutions or agreements on technical issues of the IFC are formulated by technical committees composed of national committees that are particularly concerned with these topics, and express international consensus on the issues involved as much as possible. 2) These resolutions or agreements are for international use in the form of standards and are accepted by various national committees in this sense. 3) In order to promote international unification, IEC hopes that all national committees will adopt IEC standards in their respective national regulations under the conditions permitted by their domestic conditions. If there are any inconsistencies between IEC standards and corresponding national regulations, they should be clearly pointed out in the national regulations as much as possible.
IEC Introduction
This standard is based on IEC Technical Standard 64 (Electrical Installations in Buildings) The draft of this standard was discussed at the Anacapri Conference in 1981. As a result of the discussion at the conference, the draft document 64 Central Office) 125 was proposed and submitted to the National Committee for voting in April 1982 in accordance with the June Law. The National Committees of the following countries voted explicitly in favor of publication AustraliabzxZ.net
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National Standard of the People's Republic of China
Electrical Installations in Buildings
Part 7: Requirements for Special Installations or Locations Section 706: Narrow Conductive Locations
Eleetrical Installations of buildings—Part 7: Requirements for special installations or locations—Section 706. Restrictive conducting locations 706. 1引
GB16895.8-—2000
idt IEC 60364-7-706:1983
The provisions of Part 7 are used to supplement, modify or cancel the general requirements of other parts of IEC Publication 60364. The numbers added after the specific section numbers in Part 7 correspond to the chapter, section or article numbers in IEC Publication 60364. If the chapter, section or article numbers of IEC Publication 60364 are not listed, it means that the general requirements of these articles are applicable in this part.
706 Narrow Conductive Locations
706.1 Scope
The specific requirements of this section apply to the requirements for power supply of electrical installations in narrow conductive locations and equipment in these locations. Narrow conductive locations are locations mainly composed of metal or conductive materials. People in such locations are likely to come into contact with surrounding metal objects through a large area of ​​their body, and the possibility of preventing such contact is very small. 706.4 Safety protection
706.41 Protection against electric shock
706.411.1.3.7 When safety extra-low voltage is used, regardless of the nominal voltage value, the following direct contact protection methods should be adopted: - Use fences or outer shields for protection, and the enclosure protection level should not be lower than IP2X; - Or be insulated, and the withstand test voltage is 500V for 1 min. 706.471 Application of electric shock protection measures
706.471.1 Direct contact protection
The use of barriers (6.3 of GB 14821.121) and protection measures placed outside the reach of the arm (6.4 of GB 14821.1) is not allowed. Adoption instructions:
1] "Safety extra low voltage" - in GB 14821.1-1993 Electric shock protection for electrical installations in buildings has been changed to "special voltage (ELV): SELV and PELV". Due to the changes in the terminology and connotation, this standard still uses "safety extra low voltage". 2] GR 14821.1-1993 Electric shock protection for electrical installations in buildings $ is equivalent to IEC 364-4-41:1992 Electrical installations in buildings Part 4: Safety protection Chapter 41: Electric shock protection standard. Approved by the State Administration of Quality and Technical Supervision on October 17, 2000, and implemented on July 1, 2001
706-471.2 Indirect contact protection
Only the following power supply methods are allowed to be used as protective measures: GB16895.8-2000
a) For the power supply of hand-held tools and portable measuring equipment: - Use safe extra-low voltage (5.1 of GB14821.1)1 or use electrical isolation (7.5 of GB 14821.1). Only one device should be connected to one secondary group of the isolation transformer, and Class I equipment should be used first. When Class I equipment is used, the device should have at least one handle, which is made of insulating material or has an insulating layer.
Note: The isolation transformer can have several secondary groups. b) Power supply for portable lamps:
--Safety extra-low voltage (5.1 of GR14821.1) 1 Fluorescent lamps with built-in high-efficiency winding transformers powered by safety extra-low voltage power supply are also permitted. c) Power supply for fixed installation equipment:
- Automatic power cut-off (7.1 of GB14821.1), auxiliary equipotential bonding should be made between the exposed conductive parts of the fixed installation equipment and the conductive parts of the place (7.1.6 of GB14821.1) - or use safety extra-low voltage (5.1 of GB14821.1) - or use electrical isolation (7.5 of GB14821.1), only one device should be connected to one secondary winding of the full-isolation transformer, 706.471.2.2 The safety power supply and the isolation power supply should be installed outside the narrow conductive place, but the built-in double-winding transformer of the fluorescent lamp that meets the requirements of item b) of 706.471.2 can be installed in the narrow conductive place. 706.471.2.3 When a fixed installation of equipment, such as metering and control equipment, requires functional grounding, equipotential bonding should be performed between the exposed conductive parts of all equipment, all exposed conductive parts of all devices within a narrow conductive location, and the functional grounding.
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