3240 Epoxy Sheet Applications and Selection in Distribution Cabinets

3240 Epoxy Sheet Application Scenarios 3240 epoxy sheet is made of electrical-grade fiberglass cloth impregnated wit...

3240 Epoxy Sheet Application Scenarios

3240 epoxy sheet is made of electrical-grade fiberglass cloth impregnated with epoxy resin, laminated under heat and pressure. It offers high mechanical strength, excellent electrical insulation, and Class B (130°C) heat resistance. In distribution cabinets

it is mainly used for:

Partitions and Phase Barriers

Used to isolate high-voltage busbars or separate functional zones, preventing phase-to-phase short circuits, creepage, and arc propagation.

Ensures electrical clearance and creepage distances in compliance with safety standards.

Supports and Fixing Components

Fabricates busbar supports, mounting bases, and fastening parts to bear the weight of busbars and mechanical impacts.

Maintains stability without deformation under long-term operation, thermal cycling, and vibration.

Busbar Protective Covers

Encloses exposed busbars to prevent accidental contact or foreign conductive object intrusion.

Equipment Mounting Base Plates

Serves as base plates for circuit breakers, contactors, relays, and other electrical devices, providing both mechanical support and electrical insulation.

3240 Epoxy Sheet Selection Guidelines

Thickness Selection

Partitions and protective covers: Commonly 3–6 mm, balancing strength and ease of machining.

Supports and base plates: Commonly 8–12 mm, ensuring adequate load-bearing and bending resistance.

High-load structural parts: 15 mm or thicker for enhanced rigidity and impact resistance.

Dimensions and Machining Accuracy

Custom sizes according to cabinet structure; precise drilling and slotting to ensure assembly convenience.

Heat and Insulation Class

Most distribution cabinets operate below 100°C; Class B (130°C) is sufficient.

For high-voltage systems, focus on dielectric strength to ensure safe operation at rated voltage.

Surface Treatment

Critical areas may be chamfered or coated with insulating varnish to reduce the risk of partial discharge.

Summary

In distribution cabinets, 3240 epoxy sheet serves not only as an insulating medium but also as a structural load-bearing material. Proper selection and precision machining can significantly improve the safety, stability, and service life of the cabinet.