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GB 50169-2016: Code for construction and acceptance of grounding connection electric equipment installation engineering
GB 50169-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50169-2016
Code for construction and acceptance of grounding
connection electric equipment installation engineering
ISSUED ON. AUGUST 18, 2016
IMPLEMENTED ON. APRIL 1, 2017
Jointly issued by. Ministry of Housing and Urban-Rural Development of
the PRC;
General Administration of Quality Supervision,
Inspection and Quarantine of the PRC.
Table of Contents
1 General provisions ... 7 
2 Terms ... 8 
3 Basic requirements ... 10 
4 Grounding of electric equipment ... 12 
4.1 Selection of grounding connection ... 12 
4.2 Laying of grounding connection ... 15 
4.3 Join of grounding electrode (conductor) ... 19 
4.4 Reducing resistance of grounding connection ... 22 
4.5 Grounding of wind turbines and photovoltaic power station ... 23 
4.6 Grounding of air-termination system ... 25 
4.7 Grounding of transmission poles and towers ... 26 
4.8 Grounding of main control building, dispatching building and communication
station ... 28 
4.9 Grounding of relaying protection and security automatic equipment ... 30 
4.10 Grounding of metal jacket of power cable ... 32 
4.11 Grounding of distribution electric equipment ... 32 
4.12 Grounding of structures electric equipment ... 33 
4.13 Grounding of portable and mobile appliances ... 34 
4.14 Grounding against lightning induction and static electricity ... 35 
5 Engineering succession and acceptance ... 37 
Explanation of wording in this code ... 38 
Lists of quoted standards ... 39 
1 General provisions
1.0.1 To ensure the construction quality of grounding connection electric
equipment installation engineering, promote the improvement of technical level
of engineering construction, and to ensure the safe operation of grounding
connection, this Code is developed.
1.0.2 This Code is applicable to the construction and acceptance of grounding
connection electric equipment installation engineering, and not to the
construction and acceptance of high voltage DC power transmission grounding
electrode.
1.0.3 The construction and acceptance of grounding connection shall, in
addition to complying with this Code, comply with the current relevant national
standards.
2 Terms
2.0.1 Grounding electrode
Metal conductors buried in the ground and in direct contact with the earth are
called grounding electrodes. They are classified into horizontal grounding
electrodes and vertical grounding electrodes.
2.0.2 Natural grounding electrode
Various metal components, metal well pipes, foundations of reinforced concrete
buildings, metal pipelines and equipment in direct contact with the earth which
can be utilized for grounding.
2.0.3 Air-termination system
The generic term of devices for accepting lightning stroke, including lightning
rod, lightning belt, lightning conductor, lightning protection net, metal roofing,
and metal components, etc..
2.0.4 Grounding conductor
A metal conductor which is used to connect the grounding terminal of electric
equipment and air-termination system to the grounding electrode and does not
carry current under normal conditions.
2.0.5 Grounding connection
The sum of grounding electrode and grounding conductor.
2.0.6 Grounded
USE grounding conductor to connect the electric equipment, facilities,
overvoltage protective devices of power systems or structures to the grounding
electrode.
2.0.7 Grounding impedance
The impedance between a given point and a reference point of systems,
devices, or equipment at a given frequency.
2.0.8 Ground resistance
The resistive component of grounding impedance, which is power frequency
ground resistance at the power frequency.
2.0.9 Neutral line
3 Basic requirements
3.0.1 The installation of grounding connection shall be carried out by the
engineering construction organization in accordance with the approved design
documents.
3.0.2 When adopting new techniques, new technologies, and new materials,
they shall be tested and verified with national qualification.
3.0.3 The installation of grounding connection shall be in accordance with the
construction of the construction engineering. Before covering concealed
portions, related organizations shall make inspections and acceptances and
form records.
3.0.4 The following metal parts of electric equipment must be grounded.
1 Metal base, framework, shell, and transmission of electric equipment.
2 Metal base and shell for portable or mobile electric equipment.
3 Metal boxes of box-type substation.
4 Secondary winding of mutual inductor.
5 The panel (cabinet, box) for power distribution, control, and
protection, and the metal framework and base of console.
6 Metal jacket, connector box, terminals, and metal protection tube of
power cable, and shielding layer of secondary cable.
7 Cable bridges, bearers, and derricks.
8 Substation (converter station) framework, bracket.
9 Power line pole and tower with overhead ground wire or electric
equipment.
10 Metal barriers of power distribution equipment.
11 Metal shell for electric heating equipment.
3.0.5 The DC system grounding connection which needs to be grounded shall
meet the following requirements.
1 The grounding conductor which can form a closed loop with the ground
and often flows through current shall be laid along the insulating padding
plate; and shall not be metal-connected with metal pipelines, structures,
4 Grounding of electric equipment
4.1 Selection of grounding connection
4.1.1 Various grounding connections utilize natural grounding electrodes
directly buried in the ground or in the water. The following natural grounding
electrodes can be utilized.
1 Metal pipelines buried in the ground, but do not include pipelines which
transport combustible or explosive materials.
2 Metal well pipes.
3 The metal structure of a building which has a reliable join to the earth.
4 Metal pipes, piles, and foundation layer rebar meshes for hydraulic
structures and other structures located in water or moist soil environments.
4.1.2 The grounding conductor of the AC electric equipment can be grounded
using the following grounding electrodes.
1 Metal structure, beams, and columns of buildings.
2 The runway, corridors, platforms of production cranes, framework of cranes
and lifts, steel beams for transporting belt, framework of electric
precipitators, and other metal structures.
4.1.3 Grounding connections such as power plants and substations, in addition
to natural grounding electrodes, shall also be laid with a grounding grid which
consists mainly of horizontal artificial grounding electrodes. A measuring well
which separates the natural grounding electrode from the artificial grounding
electrode shall also be provided. For substations and power distribution stations
of 3kV ~ 10kV, when the rebar mesh in the structure foundation is used as the
grounding electrode and the ground resistance meets the specified value, no
artificial grounding is required.
4.1.4 The selection of grounding connection material shall meet the following
requirements.
1 Except for temporary grounding connections, the grounding connection,
when using steel, shall be hot dip galvanizing. The horizontally laid
connection shall be round steel and flat steel of hot dip galvanizing. The
vertically laid connection shall be angle steel, steel pipe, or round steel of
hot dip gal...