Eaton 1MM320R Residential Meter Stack - UL Listed

Part Number: 1MM320R
Manufacturer
Eaton
Part number
1MM320R

Quick Summary

Eaton 1MM320R residential meter stack provides outdoor single-phase metering for residential service applications. Space constraints and installation complexity often delay outdoor metering upgrades, making a compact, ready-to-install solution essential. UL Listed certification ensures electrical safety compliance, and utility approvals across AL, DC, MD, NJ, TX and others support permit-ready installations in many jurisdictions. This meter stack combines a rugged outdoor enclosure with three sockets and a 200A amperage rating, enabling scalable metering for growing homes or multi‑tenant facilities. By consolidating metering hardware in a weather-resistant unit, it reduces installation time and total cost of ownership while improving reliability in outdoor environments.

Product Information

Extended Description

1MM320R Eaton: Eaton residential meter stack, Amperage rating: 200A, Socket rating: 200A, Bus rating: 800A, Outdoor, Interrupt rating depends on selected main circuit breaker, Single-phase in/single-phase out, 3 Sockets, Aluminum, Ring, 120/240 Vac
Product Name
Eaton residential meter stack
Catalog Number
1MM320R
UPC
786849051945
Product Length/Depth
7.01 in
Product Height
52.35 in
Product Width
13.5 in
Product Weight
66 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
UL Listed
Type
Multiple metering
Utility approvals
AL : Alabama Power DC : Atlantic City Electric / Delmarva (Connectiv) DE : Atlantic City Electric / Delmarva (Connectiv) MD : Atlantic City Electric / Delmarva (Connectiv) NJ : Atlantic City Electric / Delmarva (Connectiv) TX : CenterPoint Energy (HL&P/Reliant) NC : Dominion VA : Dominion MI : DTE Energy (Detroit Edison) NM : El Paso Electric TX : El Paso Electric MO : Empire District Electric OK : Empire District Electric AR : Entergy LA : Entergy MS : Entergy TX : Entergy CA : City of Los Angeles - DWP (LADWP) AZ : Southern California Edison CA : Southern California Edison CA : Pacific Gas and Electric (PG&E) CA : Sacramento Municipal Utility District (SMUD) TN : Nashville Electric Service CA : PacifiCorp/Pacific Power/Rocky Mountain Power ID : PacifiCorp/Pacific Power/Rocky Mountain Power OR : PacifiCorp/Pacific Power/Rocky Mountain Power UT : PacifiCorp/Pacific Power/Rocky Mountain Power WA : PacifiCorp/Pacific Power/Rocky Mountain Power WY : PacifiCorp/Pacific Power/Rocky Mountain Power HI : Hawaiian Electric MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy MD : Baltimore Gas and Electric DC : PEPCO MD : PEPCO AZ : Tucson Electric Power/ UniSource AZ : Sulphur Springs Valley Electric Coop IN : Indianapolis Power and Light (IP&L)
Interrupt rating
Depends on selected main circuit breaker
Enclosure
Outdoor
Bus Rating
800 A
Phase
Single-phase in, single-phase out
Voltage rating
120/240 V
Amperage Rating
200A
Outdoor enclosure and UL Listed protection: The rugged enclosure shields metering components from weather, dust, and corrosion, reducing commissioning failures and maintenance needs. This translates to lower field service costs and longer system life in outdoor environments. Application: outdoor residential service entrances and compact commercial metering where weather exposure is a factor. Multiple metering capability with three sockets and an 800 A bus rating: The design accommodates several metering points in one compact unit, cutting hardware footprint and simplifying wiring diagrams. This yields faster installations and easier expansion for multi-tenant properties. Application: shared service corridors and small commercial facilities seeking scalable metering. Amperage, voltage, and phase compatibility: 200 A amperage with 120/240 V single-phase in/out supports standard residential feeds and straightforward main-breaker integration. Business impact: accelerates commissioning, reduces design changes, and improves protection coordination. Application: typical residential feeders and light commercial deployments. Interruption rating tied to main circuit breaker: You select the main device to meet site protection needs, ensuring appropriate fault handling without overprotection. Business impact: cost optimization and safer, code-compliant installations. Application: sites with specific utility or local code requirements. Utility approvals plus UL Listing: The unit’s UL Listing and documented utility approvals help streamline permitting and energization. Business impact: shorter lead times, fewer RA/inspection delays, and quicker project turnover. Application: field deployments requiring utility acceptance. Physical dimensions and weight for planning: At 52.35 in tall, 13.5 in wide, 7.01 in deep and 66 lb, it fits standard mounting provisions and reduces handling complexity. Business impact: easier retrofit, safer handling, and predictable shipping logistics. Application: retrofit projects and new builds in outdoor spaces. Warranty and support: One-year base warranty from installation or eighteen months from shipment, whichever occurs first, plus access to Eaton documentation and support. Business impact: predictable maintenance budgeting and assured product assistance. Application: asset management programs and service contracts.

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FAQs

The 1MM320R supports outdoor single-phase metering at 120/240 V with three sockets and an 800 A bus rating, making it suitable for multi‑meter configurations. Its 200 A amperage rating aligns with standard residential feeds, and the interruption rating depends on the main circuit breaker chosen. This combination facilitates straightforward wiring, safer terminations, and scalable installation for growing services.
The unit carries UL Listed certification and is designed to align with a broad range of utility approvals. In practice, approvals from utilities such as Alabama Power, Atlantic City Electric (Delmarva), CenterPoint Energy, DTE, El Paso Electric, PEPCO, Pacific Gas & Electric, and others help streamline permitting and energization across multiple jurisdictions, reducing field delays and improving inspection outcomes.
Key considerations include ensuring an appropriate outdoor-rated enclosure, securing the unit to a compliant structure, and planning for main breaker compatibility since interruption rating depends on the selected main. Also consider the unit’s dimensions (52.35 in height, 13.5 in width, 7.01 in depth) and weight (approximately 66 lb) for site access, mounting, and handling during retrofit or new-build projects.
Eaton provides a one-year warranty from the date of installation or up to eighteen months from shipment, whichever occurs first, under Eaton Selling Policy 25-000. Customers also gain access to Eaton’s technical datasheets and product literature, with support available for installation, troubleshooting, and field integration to ensure dependable operation.
UL Listed certification confirms compliance with safety standards for electrical equipment, while the outdoor enclosure and single-phase 120/240 V design align with typical code expectations for residential service entrances. Utility approvals further support permitting and energization, reducing the likelihood of rework and helping projects pass inspections on the first visit.