400 Amp Single Phase Meter Base — Ringless Socket

Yes. A 400A single phase meter base is commonly used in small to mid-size commercial service entrances, light industrial buildings, and multi-tenant properties where load requirements fall within the 400A threshold. It must be matched to the serving utility's approved equipment list and installed in accordance with local electrical codes, including NEC Article 230 requirements for service entrance conductors and metering.

In many Western U.S. utility territories, EUSERC (Electric Utility Service Equipment Requirements Committee) approval is a mandatory requirement before a meter base can be installed on the utility's system. EUSERC-approved equipment meets standardized construction, safety, and interoperability criteria that utilities rely on for consistent metering infrastructure. Always verify your specific utility's approved equipment list before purchasing.

The standard voltage rating for a 400A single phase meter base is 120/240V, which is the typical residential and light commercial single phase service in North America. Some configurations also support 240V only. Confirm the voltage configuration required by your utility and project specifications before ordering, as incorrect voltage ratings can result in failed utility inspections.

Yes, provided the unit is housed in a NEMA 3R-rated enclosure, which is designed for outdoor use and provides protection against rain, sleet, and external ice formation. Indoor installations typically use NEMA 1 enclosures. Always verify the enclosure rating required by your utility and local authority having jurisdiction (AHJ) before specifying indoor or outdoor configurations.

At minimum, a 400A meter base should be UL Listed to confirm it has been independently tested for safety. For utility acceptance in many jurisdictions — particularly across the Western U.S. — EUSERC Approval is also required. UL 891 certification applies to the broader switchgear assembly and confirms compliance with standards for low-voltage switchboards. Verify your utility's approved equipment list for the specific certifications required in your service area.

DEI Power ships most orders within 1 business day from our 50,000 sq. ft. facility in Ontario, California, with standard delivery in 3–5 business days. Free shipping is included on all orders. In rare cases where custom utility specifications are required, lead times may extend up to 5 business days. Contact a DEI Power specialist to confirm availability and schedule for your specific project requirements.