- Chinese
- English

Home

Materials used in fully insulated busbars

Fully insulated busbars use epoxy resin as the insulating material, which exhibits exceptionally excellent insulation properties and can withstand voltages exceeding 50,000 V. Epoxy resin, as an insulating material, offers distinct advantages such as superior dielectric performance, high mechanical strength, and excellent sealing and cost-effectiveness. The sections of a fully insulated cast‑in‑place busbar are spaced apart, including the resin‑cast tee joints. Even if the conductors within the fully insulated cast‑in‑place busbar have burrs, these will not compromise the resin insulation or cause a short circuit. Moreover, since the fully insulated cast‑in‑place busbar lacks an external enclosure, the risk of inter‑section short circuits is virtually eliminated.

As an anti-corrosion coating, epoxy resin not only boasts high density, moisture resistance, leak‑proofing, and exceptional mechanical strength, but also exhibits strong adhesion, ease of handling at ambient temperatures, and straightforward installation. Unlike ordinary resins, it is well suited for fully insulated busbar casting; experiments have shown that the insulation resistance of conventional resins drops sharply at 80°C, whereas the operating temperature of a fully insulated busbar can reach 100°C. Even at 100°C, it continues to maintain stable insulating properties over the long term. Moreover, this type of resin has a coefficient of thermal expansion very close to that of copper. In addition, since busbar trunking systems do not incorporate plastic enclosures, differences in linear thermal expansion are unlikely to cause interphase short circuits or phase-to-phase faults.

After all, it is fully enclosed and meets the IP68 protection‑class requirements, ensuring that moisture cannot penetrate the busbar. Such busway systems can be continuously immersed in water and even withstand long‑term exposure in corrosive environments. The resin used for fully insulated busbars remains crack‑free down to temperatures below –50°C and can endure impact energies of 6 joules or more, eliminating the need for an additional plastic enclosure.

According to the Class A fire‑resistance requirements of GB 12666.6‑1990, even when exposed to a flame at 950°C to 1000°C for 90 minutes, a fully insulated cast‑in‑place busbar will not experience circuit interruption. Therefore, fully insulated cast‑in‑place busbars can be used as fire‑resistant busway systems.

Product Categories

Volcanic rock silicon mineral fully cast bus duct

Plug box

Address: No. 735, Xinling Road, Shiqi, Panyu District, Guangzhou City, Guangdong Province

400-8599-366

020-3195-7335

Email：sales@betoba.cn

WeChat Official Account