What are the precautions for using isolation safety barriers? Let’s take a look.
发布时间：
2022-05-16
What are the precautions for using isolation safety barriers? Let’s take a look. 1. Isolation safety barriers should be installed in non-hazardous areas, and the cross-sectional area of the flexible copper wire leading to the field (hazardous area) must be greater than 0.5 mm²; the insulation strength of the connecting wire must exceed 500 V. 2. The intrinsically safe side (marked in blue) and the non-intrinsically safe side of the isolation safety barrier must not have their wiring reversed or confused.
What are the precautions for using isolation safety barriers? Let’s take a look.
1. Isolation safety barriers shall be installed in non-hazardous areas, and the cross-sectional area of the flexible copper conductors leading to the field (hazardous area) shall be greater than 0.5 mm²; the insulation strength of the connecting leads shall exceed 500 V.
2. The circuit wiring for the intrinsically safe terminal (marked in blue) and the non-intrinsically safe terminal of the isolation safety barrier must not be reversed or confused. Intrinsically safe conductors shall be identified by the color blue as the intrinsically safe marking. Intrinsically safe and non-intrinsically safe wires shall be routed separately in cable trays and provided with their own protective conduits. On the intrinsically safe side of the isolation safety barrier, mixing with other power supplies is prohibited, including power supplies for other intrinsically safe circuits.
3. When an isolation safety barrier is combined with a primary instrument to form an intrinsically safe explosion-proof system, it must be certified as compliant by a designated explosion-proof inspection agency. The DRG series safety barriers are evaluated by the National Explosion-Proof Testing Center (CQST), with their distributed parameters Co and Lo specified as the maximum permissible values relative to the IIC (hydrogen) category; for IIB environments, these values may be multiplied by 3, and for IIA environments, by 8. When selecting cables of different specifications for power transmission lines, particular attention must be paid to the cable’s inherent parameters, which must not exceed the prescribed limits.
4. When performing standalone electrical commissioning of an isolation safety barrier, be sure to pay close attention to the model, power supply polarity, voltage, and other relevant parameters, as well as the labels on the isolation safety barrier and on the terminals of its enclosure.
5. It is prohibited to use a megohmmeter to test the insulation between the terminals of an isolation safety barrier. If you need to inspect the insulation of the system circuit, first disconnect all isolation safety barrier leads; otherwise, internal components may be damaged.
6. All field instruments connected to the isolation safety barrier shall be certified as explosion-proof by the relevant explosion-proof authority.
7. If an internal module of the isolation safety barrier is damaged and requires repair or replacement, such work shall, in principle, be undertaken by the manufacturer. Users shall adhere to the relevant precautions outlined in the self-maintenance procedures; specific methods are detailed in the maintenance section. (Maintenance of intrinsically safe instruments is limited to the prescribed scope; any other maintenance activities must be discussed with the manufacturer.) After repair, the equipment may be returned to service; however, no unauthorized modifications may be made to components or structures that could compromise explosion-proof performance.
8. The installation, use, and maintenance of intrinsically safe barriers shall be in strict compliance with the relevant provisions of GB 3836.15-2000, “Electrical Equipment for Explosive Gas Atmospheres—Part 15: Electrical Installations in Hazardous Locations (Excluding Coal Mines).”
9. The isolation safety barrier shall be reliably grounded, with a grounding resistance not exceeding 4 Ω and a grounding conductor resistance not exceeding 1 Ω.
If you would like to learn more about isolation safety barriers, please feel free to contact us. We can provide comprehensive information from various perspectives. As a manufacturer with many years of experience in this industry, we are well-positioned to share detailed insights and help you gain a thorough understanding of the field.
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