In explosive hazardous environments, the exposed non-charged metal parts of electrical equipment such as the metal enclosures, metal frameworks, equipment installed on grounded metal structures, metal piping and its fittings, cable protection conduits, and the metal sheaths of cables, etc., should all be grounded. Many standards have made clear regulations on the grounding requirements for electrical equipment in explosive hazardous environments.
The grounding wire settings for electrical equipment should be treated differently according to different hazardous areas and types of electrical equipment. The metal enclosures of all electrical equipment in explosive environments, regardless of whether they are installed on grounded metal structures, should be grounded. The relevant requirements are as follows:
1) All electrical equipment in explosive environment Zone 1, Zone 20, and Zone 21, as well as all electrical equipment except lighting fixtures in explosive environment Zone 2 and Zone 22, should have dedicated grounding wires added. Note: If the dedicated grounding wire is laid in the same protective conduit as the phase wire, it should have the same insulation level as the phase wire.
2) For lighting fixtures in explosive environment Zone 2 and Zone 22, a reliable electrical connection metal piping system can be used as the grounding wire, but pipelines for conveying explosive hazardous substances cannot be used.
3) The dedicated grounding wires for electrical equipment and lighting fixtures should be separately connected to the grounding main (network), and the working neutral wire in the electrical circuit should not be used as the protective grounding wire.
4) The connection between electrical equipment in explosive hazardous environments and the grounding wire should preferably use multi-strand flexible stranded wire, with the minimum cross-sectional area of copper wire not less than 4 mm². Protective tubes should be installed at parts prone to mechanical damage.
5) When armored cables are introduced into electrical equipment, the grounding wire should be connected to the grounding bolt inside the equipment; the steel tape and metal enclosure should be connected to the external grounding bolt of the equipment.
6) The bolts used for grounding or zero connection in explosive hazardous environments should have anti-loosening devices; before tightening the grounding wire, the grounding terminals and fasteners should be coated with power compound grease.
There are many grounding requirements for electrical equipment in explosive hazardous environments. In the design and installation process, in addition to meeting the above requirements, relevant standards should also be followed.
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