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GB 50601-2010: Code for construction and quality acceptance for lightning protection engineering of structures
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GB 50601-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50601-2010
Code for construction and quality acceptance for lightning
protection engineering of structures
ISSUED ON: JULY 15, 2010
IMPLEMENTED ON: FEBRUARY 01, 2011
Issued by: Ministry of Housing and Urban-Rural Development of PRC.
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
Foreword ... 6
1 General provisions ... 8
2 Terms ... 9
3 Basic requirement ... 11
3.1 Quality management of construction site ... 11
3.2 Requirements of construction quality control ... 11
4 Subdivision work of earth-termination system ... 13
4.1 Installation of earth-termination system ... 13
4.2 Installation procedures of earth-termination system ... 15
5 Subdivision work of down-conductor system ... 16
5.1 Installation of down-conductor system ... 16
5.2 Installation procedures of down-conductor system ... 18
6 Subdivision work of air-termination system ... 19
6.1 Installation of air-termination system ... 19
6.2 Installation procedures of air-termination system ... 20
7 Subdivision work of equipotential bonding ... 21
7.1 Installation of equipotential bonding ... 21
7.2 Installation procedures of equipotential bonding ... 22
8 Subdivision work of shielding ... 23
8.1 Installation of shielding device ... 23
8.2 Installation procedures of shielding device ... 23
9 Subdivision work of generic cabling ... 25
9.1 Installation of generic cabling ... 25
9.2 Installation procedures of generic cabling ... 26
10 Subdivision work of surge protective device ... 27
10.1 Installation of surge protective device ... 27
10.2 Installation procedures of surge protective device ... 29
11 Acceptance of engineering construction quality ... 30
11.1 General requirement ... 30
11.2 Inspection lot division and test requirements of subdivision works in lightning
protection engineering ... 31
Appendix A Record of quality management and test in construction site ... 36
Appendix B Material specifications for external lightning protection system and
equipotential bonding conductors ... 37
Appendix C Classification and information requirements for surge protective device
... 42
Appendix D Installation diagram ... 46
Appendix E Records of quality acceptance ... 61
Explanation of wording in this code ... 69
List of quoted standards ... 70
3 Basic requirement
3.1 Quality management of construction site
3.1.1 The quality management of lightning protection project construction sites shall
have corresponding construction technical standards, a sound quality management
system, a construction quality inspection system, a comprehensive construction quality
level judgment and assessment system. The chief supervisory engineer or the project
leader of the construction organization shall inspect and fill in Table A.0.1 of Appendix
A of this Code item by item.
3.1.2 Construction personnel, qualifications, measuring instruments shall meet the
following requirements:
1 All types of craftsmen and technical personnel, that are involved in construction,
shall have corresponding qualifications and hold certificates to work.
2 The construction organization shall have corresponding construction qualifications.
3 Various measuring instruments, which are used in installation and commissioning,
shall be certified by the statutory metrology certification agency AND shall be used
within the validity period of the certification.
3.2 Requirements of construction quality control
3.2.1 The mobilization inspection conclusions of the main equipment, materials,
finished products, semi-finished products, which are used in lightning protection
projects, shall be recorded. They shall be used in construction, after confirming that
they comply with the provisions of this Code. For mobilization acceptance of new
equipment, appliances, materials, which are approved to enter the market in accordance
with legal procedures, suppliers shall also provide technical documents, such as
installation, use, maintenance, testing requirements. For the mobilization acceptance of
imported equipment, appliances, materials, suppliers shall also provide commercial
inspection (or domestic testing agency) certificates and quality certification documents
in Chinese, specifications, models, performance inspection reports, as well as the
technical documents on the installation, use, maintenance, testing requirements in
Chinese.
Where there are objections to the main equipment, materials, finished products, semi-
finished products, which are used in lightning protection projects, sampling testing shall
be carried out, by the laboratory of the statutory testing agency; meanwhile a testing
report shall be issued.
4 Subdivision work of earth-termination system
4.1 Installation of earth-termination system
4.1.1 The dominant items shall comply with the following requirements:
1 For the natural earth electrode, that uses the steel bars in the pile foundation, beams,
columns of the building as the earth-termination system, AND the artificial earth
electrode specially buried for earthing needs, it shall provide connection plate
aboveground in accordance with requirements, which is used for measurement,
connection to the artificial earth electrode, equipotential bonding.
2 The earthing resistance value of the earth-termination system shall comply with
the requirements of the design document.
3 Within 3 m of the connection -- between the down-conductor and the earth
electrode, where people outside the building can pass or stay, it shall use one or
more methods to prevent step voltage from causing harm to personnel, as follows:
1) Lay a 5 cm thick asphalt layer or a 15 cm thick gravel layer, so that the ground
resistivity is not less than 50 kΩ·m.
2) Set up guardrails or warning signs, to prevent people from entering.
3) Lay the earth electrode into a horizontal grid.
4 When the engineering design document designates the earth-termination system of
first category of lightning protection building as independent earthing, the
separation distance -- BETWEEN the independent earth electrode and the building
foundation ground network AND the pipes, cables, other metal objects associated
with it -- shall comply with the provisions of Article 4.2.1 in the current national
standard "Design code for protection of structures against lightning" GB 50057-
2010.
4.1.2 General items shall comply with the following requirements:
1 When there is no requirement in the design, the burial depth of the top surface of
the earth-termination system shall not be less than 0.5 m. Earth electrode, such as
angle steel, steel pipes, copper rods, copper pipes, shall be arranged vertically. The
length of artificial vertical earth electrode should be 2.5 m; the spacing between
artificial vertical earth electrodes should not be less than 5 m. The horizontal
distance -- between the artificial earth electrode and the building's exterior wall or
foundation -- should not be less than 1 m.
2 The following methods can be used, to reduce the earthing resistance:
2) When the conductors are copper and copper or copper and steel, the connection
process shall be exothermic welding. The fusion joint shall completely enclose
the connected conductor in the joint. It shall ensure that the metal at the
connection part is completely melted AND the welding joint shall be
connected firmly.
5 The earthing conductor connection requirements and measures to prevent
mechanical damage and chemical corrosion shall comply with the provisions of
Article 3.2.7, Article 3.3.1, Article 3.3.3 of the current national standard "Code for
construction and acceptance of grounding connection electric equipment
installation engineering" GB 50169-2006.
6 For the construction diagram of the connection between the earth-termination
system and the down-conductor at the ground level AND the earthing construction
diagram of building foundations with different foundations, see Figure D.0.1-1 ~
Figure D.0.1-3 in Appendix D of this Code.
7 When the earth electrode laid in the soil is connected to the steel in the concrete
foundation, it should use copper or stainless steel.
4.2 Installation procedures of earth-termination system
4.2.1 After the laying of the steel bars on the bottom plate of the natural earth electrode
is completed, the earthing construction shall be carried out according to the design
requirements. The formwork or concrete pouring shall be carried out, after inspection
and confirmation and taking the acceptance record of the concealed work.
4.2.2 For the artificial earth electrode, it shall open trenches at locations according to
the design requirements and drive in the artificial vertical earth electrode, OR lay metal
earthing modules (tubes) and use artificial horizontal earth electrode for electrical
connections. This shall be inspected and confirmed and a concealed work acceptance
record shall be made.
4.2.3 The concealed earth-termination system shall be inspected and accepted, before
being backfilled with soil.
5 Subdivision work of down-conductor system
5.1 Installation of down-conductor system
5.1.1 The dominant items shall comply with the following requirements:
1 The installation layout of down-conductors shall comply with the relevant
provisions of the current national standard "Design code for protection of structures
against lightning" GB 50057. The number of dedicated down-conductors for the
first, second, third categories of lightning protection buildings shall not be less than
2, which shall be evenly distributed around the building; their average spacing shall
not be greater than 12 m, 18 m, 25 m, respectively.
2 The dedicated down-conductors for open laying shall be fixed in sections; they
shall be laid to the earth electrode via the shortest path. The laying shall be smooth
and straight without sharp bends. The welds fixed by welding shall be full and
without omissions. The bolts shall have anti-loosening parts (washers). The anti-
corrosion of the welded parts shall be complete.
3 When the down-conductor outside the building is laid in an area, where people
can stay or pass by, one or more of the following methods shall be used, to
prevent contact voltage and side flashover voltage from causing harm to
personnel:
1) The part of the exposed down-conductor, which is below 2.7 m in height,
shall be worn through a cross-linked polyethylene pipe, which has a
thickness of not less than 3 mm. The cross-linked polyethylene pipe shall
be able to withstand 100 kV impulse voltage (1.2/50 μs waveform).
2) Guardrails or warning signs shall be set up, to prevent people from
entering. The horizontal distance between guardrails and down-
conductors shall not be less than 3 m.
4 Both ends of the down-conductor shall be reliably electrically connected to the air-
termination device and the earth-termination system, respectively.
5 There shall be no other electrical lines attached to the down-conductor. When
laying electrical lines on communication towers or other metal objects, that serve
as lightning connections on tall metal structures, the lines shall use armored cables
directly buried in the soil OR conductors passing through metal conduits. The metal
sheath or metal conduit of the cable shall be grounded at both ends; the length
buried in the soil shall not be less than 10 m.
6 The distance -- between the down-conductor installation and the wall or wall
6 Subdivision work of air-termination system
6.1 Installation of air-termination system
6.1.1 The dominant items shall comply with the following requirements:
1 The air-termination systems on the top of the building and on the exterior
walls must be equipotentially connected to the building railings, flagpoles,
crane beams, pipes, equipment, solar water heaters, doors and windows,
curtain wall brackets, and other exposed metal objects.
2 The installation layout of the air-termination system shall comply with the
requirements of the engineering design documents, as well as the requirements for
the layout of air-termination systems in different category of lightning-protected
buildings in the current national standard "Design code for protection of structures
against lightning" GB 50057.
3 The air-termination conductor, which is located at the top of the building, can be
concealed in the concrete parapet or concrete roof, according to the requirements
of the engineering design documents. When concealed laying is used, the
construction of steel bars, which are used as air-termination conductors, shall
comply with the provisions of Chapter 5 of the current national standard "Code for
acceptance of constructional quality of concrete structures" GB 50204-2002. Air-
termination system in high-rise buildings shall be exposed. In areas with frequent
lightning, short lightning rods should be installed at the corners of the roof.
4 The special air-termination rod shall be able to withstand the basic wind pressure
of 0.7 kN/m2. In areas where typhoons and winds greater than level 11 occur
frequently, it should increase the size of the air-termination rod.
5 There shall be no other electrical lines or communication lines or signal lines
attached to the air-termination system. Where there are other electrical lines and
communication lines, which are laid on the communication tower, as requested in
the design document, they shall comply with the provisions of item 5 of Article
5.1.1 of this Code.
6.1.2 General items shall comply with the following requirements:
1 When metal objects such as metal roofs of buildings, flagpoles, iron towers, etc.
are used as air-termination systems, the materials and specifications of metal
objects, such as metal roofs of buildings, flagpoles, iron towers, etc., shall comply
with the relevant provisions of Appendix B of this Code.
2 The position of the special air-termination rod shall be correct; the welds fixed by
7 Subdivision work of equ...