【2026 Grounding Systems】Standards and specifications related to grounding
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1. Code for Design of Grounding of Instrumentation Systems (HG/T 20513-2014) 3.1.3 Field instruments, transmitters, local switches, etc., powered by voltages below 36V do not require protective grounding unless there are specific requirements. If contact with a power supply higher than 36V is possible, protective grounding should be implemented.
2. Code for Design of Grounding of Petrochemical Instruments (SH/T 3081-2019) 4.1.4 In non-explosive environments, the metal enclosures of field instruments powered at less than 36V do not require protective grounding; however, such grounding is necessary when they may come into contact with high-voltage equipment.
4.1.5 In explosive hazardous environments, the metal enclosures of field instruments in non-intrinsically safe systems shall be provided with protective grounding. 4.1.6 The metal enclosures of field instruments used for lightning protection shall be provided with protective grounding.
3. Code for Lightning Protection Design of Petrochemical Instrumentation Systems (SH/T 3164-2021) 9.3.1 The grounding of field instruments shall be protective grounding; the specific requirements are detailed in Table 9.3.1 below.
4. Engineering Construction and Acceptance Specifications (SH/T 3551-2024) 10.3.1 In explosive hazardous environments, the metal enclosures of field instruments that are not intrinsically safe shall be provided with protective grounding. 10.3.4 The metal enclosures of field instruments used for lightning protection shall be provided with protective grounding.
5. Code for Construction and Quality Acceptance of Automatic Instrumentation Projects (GB 50093-2013) 10.2.1 The enclosures of field instruments with a supply voltage higher than 36V shall be provided with protective grounding. 10.2.2 Field instrument switches and similar devices with a supply voltage of no more than 36V do not require protective grounding unless there are specific requirements.
6. Design Code for Instrument and Control Systems in Oil and Gas Fields and Pipeline Projects (GB/T 50892-2013) 11.3.1 The metal enclosures of all instrument equipment in explosive hazardous environments shall be reliably grounded. 11.3.2 Field instruments powered at 36V or below in non-explosion hazardous environments may not require protective grounding.
7. Design Fire Protection Code for Petrochemical Enterprises (GB 50160-2008) 9.2.4 The measurement devices for flammable liquid storage tanks shall use armored cables or steel pipes for wiring, and shall be electrically connected to the tank body.
8. Fire Protection Standards for Engineering Design of Fine Chemical Enterprises (GB 51283-2020) 11.4.3 The metal enclosures of electrical equipment in explosive hazard environments shall be reliably grounded using specialized grounding wires.
9. Safety specifications (AQ 3009-2007) 6.1.1.4.1 All non-live exposed metal parts of electrical equipment, such as its metal enclosures, shall be grounded.
10. Specifications for the Installation of On-site Safety Monitoring Equipment in Tank Areas for Major Hazardous Sources of Hazardous Chemicals (AQ 3036-2010) 6.3.6 The housing of the level sensor shall be properly grounded. 11.4.1 The tank area shall be equipped with a grounding protection system that complies with standards such as GB 12158.