480V AC Safety Disconnect Switches

To size a 3-phase disconnect, calculate the total load in amperes by dividing total wattage by the product of voltage and 1.732 (√3). Apply a 125% safety factor for continuous loads per NEC requirements. For 480V systems, DEI Power offers assemblies from 400A to 4000A to accommodate a wide range of commercial and industrial load profiles.

Per the National Electrical Code (NEC), disconnects must be readily accessible, clearly labeled, rated for the voltage and current of the circuit, and capable of interrupting the load. For 480V service entrances, the disconnect must be located at or near the service entrance point, be suitable for the enclosure environment (NEMA 1 indoor or NEMA 3R outdoor), and comply with applicable UL listing standards such as UL 891.

NEMA 1 enclosures are designed for indoor use only, providing protection against dust and incidental contact. NEMA 3R enclosures are rated for outdoor use, offering additional protection against rain, sleet, and ice formation. DEI Power's 480V disconnect assemblies are available in both ratings, allowing the correct enclosure to be selected based on installation environment and utility requirements.

Yes. DEI Power's 480V Meter Mains, Service Entrance Switchgear, and SES assemblies carry EUSERC approval, meaning they meet the utility industry's standardized requirements for service entrance equipment. EUSERC approval is required by many utility companies before metering and connection to the grid, ensuring compatibility with utility specifications and reducing project approval delays.

DEI Power's 480V disconnect assemblies are available in amperage ratings from 400A up to 4000A, including 600A, 800A, 1000A, 1200A, 1600A, 2000A, 2500A, and 3000A configurations. This broad range covers light commercial applications through large industrial facilities and utility infrastructure projects, all in a standardized UL 891-certified assembly platform.

Yes. All DEI Power 480V safety disconnect assemblies meet seismic zone requirements under the Uniform Building Code (UBC), California Building Code (CBC), and International Building Code (IBC). This makes them suitable for installation in all seismic zones across the United States, including high-seismic-risk regions in California and the Pacific Northwest.