Selecting the right medium voltage epoxy insulator is critical to ensuring long-term safety, system compatibility, and operational reliability. With multiple voltage classes, environmental conditions, and structural requirements to consider, choosing the wrong insulator can lead to costly failures or redesigns. This guide covers the essential criteria to help professionals make confident, informed purchasing decisions.
1. Voltage Rating and Insulation Level
Always match the rated voltage of the insulator with your system's operating class (e.g., 12kV, 24kV, 36kV). Confirm it meets the required basic insulation level (BIL) and creepage distance based on the environmental pollution class.
2. Application Type and Mounting Configuration
Different equipment requires different insulator types:
·Post Insulators for busbar and panel support
·Wall Bushings for cable and equipment interface
·Epoxy Cast Contact Boxes for integration in compact switchgear
Ensure that the selected model fits your layout, interface type, and mechanical load requirements.
3. Mechanical and Thermal Stress Tolerance
Consider operating temperature ranges, vibration conditions, and mechanical loads. Epoxy insulators with reinforced glass fiber or filler additives offer higher resistance to shock and deformation.
4. Environmental Resistance
For outdoor or coastal installations, choose epoxy resin with anti-tracking coatings, UV resistance, or silicone outer layers to handle humidity, pollution, and salt fog.
5. Compliance and Testing Standards
Ensure the product complies with IEC 62231, IEC 60273, or ANSI standards. Check for factory type tests (dielectric, thermal cycle, mechanical load) and third-party certification if required.
RMU (Ring Main Unit) compartments
Vacuum circuit breakers
Cast resin dry-type transformers
GIS (Gas Insulated Switchgear) interfaces
Medium-voltage control panels
Request detailed datasheets and drawings before confirming orders
Clarify installation interfaces (stud hole sizes, busbar spacing)
Ask about custom molding services for special geometry or retrofitting needs
Verify MOQ and lead time if sourcing from overseas
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