Release of joint box with internal wiring (SBJA series).
Hoshi and Electric Co., Ltd. has been supplying lighting fixtures for numerous roads and tunnels since 1957, when it delivered lighting equipment for the Kanmon Tunnel, the world's first underwater tunnel at that time. Road lighting fixtures are mounted on poles, but these poles tend to accumulate moisture, leading to condensation and water droplets. Our company offers a product that protects electrical wiring from moisture and water droplets: the pole-mounted junction box (SB series), which has over 40 years of proven performance. We are now launching a new addition to our lineup, the "Junction Box with Internal Wiring for Poles" (SBJA series), which makes internal wiring for road lighting fixtures safe and easy.
The "Junction Box with Internal Wiring for Poles" (SBJA series) has a protection rating equivalent to IP68 against water and dust, making it ideal for the moist environment inside poles. It comes with pre-wired connections that allow for safe and easy installation, and it is also easy to inspect. The junction box has a sealed compartment for the breaker and terminal block in some specifications, protecting the electrical wiring from moisture and water droplets that may accumulate inside the pole. Additionally, the top cover can be opened for voltage and insulation resistance measurements.

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Overview and Features
A waterproof and dustproof plastic box that houses a breaker and terminal block, shutting out moisture and water droplets inside the pole that can cause insulation failure.
1. Breaker operation can be performed without opening the top cover, making installation and inspection work easy.
2. The protection level against water and dust is equivalent to IP68. It can be submerged in water at a depth of 1 meter for 2 weeks without water ingress into the device.
3. Because it uses a box with excellent airtightness, there is no insulation deterioration due to wiring connections.





