Milbank 320A Ringless Meter So...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$546.01
$339.16
Milbank U1779-R Ringless Meter Sockets — Large Hub Open and Lever Bypass Configurations

Milbank 320A Ringless Meter Socket with Lever Bypass and Large Hub Opening

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Model: U1779-R-K3-BLG

In Stock (leaves warehouse same day if ordered before 3pm ET)

$546.01
$339.16
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Milbank 320A Ringless Meter Socket with Lever Bypass and Large Hub Opening

Professional 1-Phase Metering Solution with Overhead Cable Entry

The Milbank 320A Ringless Meter Socket delivers reliable single-phase electrical metering with professional-grade construction. Featuring a 320 continuous ampere rating, lever bypass provision, and large hub opening configuration, this UL Listed Type 3R enclosure provides versatile overhead cable entry for residential and commercial applications. Built with G90 galvanized steel and powder coat finish for lasting durability.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles high-capacity electrical loads with reliable current-carrying performance for demanding applications.
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without interrupting electrical service to the facility.
  • Large Hub Opening Configuration: Accommodates versatile cable entry options and simplifies installation with overhead service connections.
  • G90 Galvanized Steel Construction: Provides superior corrosion resistance and structural integrity with durable powder coat finish.
  • UL Listed Type 3R Rating: Ensures compliance with safety standards and weather-resistant performance for outdoor installations.
  • Glass Polyester Insulation: Delivers reliable electrical isolation and thermal performance in demanding environments.
  • Bonded Ground Strap: Provides secure equipment grounding connection for enhanced electrical safety and code compliance.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Barrel Lock Provision: 7/8 Inch Knockout and Angle Bracket For Barrel Lock Provision
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Overhead
  • Departent: Electrical
  • Equipment Ground: Bonded Ground Strap
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Large Hub Opening
  • Insulation: Glass Polyester
  • Line Side Wire Range: 4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
  • Main Breaker Size: No Main Breaker
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 1 Phase
  • Product Height: 38.75 IN
  • Product Length: 4.844 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 4.844L x 13W x38.75H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 13 IN

Professional Applications

  • Residential Service Entrance Metering
  • Commercial Building Electrical Service
  • Multi-Unit Property Metering
  • Industrial Facility Power Distribution
  • Utility Company Service Connections
  • Electrical Contractor Installations
  • Building Code Compliance Projects

Why Choose Milbank Quality?

Milbank delivers proven reliability with UL Listed certification and Type 3R weather-resistant construction. The G90 galvanized steel with powder coat finish ensures long-term durability, while the comprehensive wire range compatibility and professional mounting design provide versatile installation options for demanding electrical applications.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Overhead
Equipment Ground:
Bonded Ground Strap
Frequency Rating:
60 Hertz
Hub Closing Plate:
Large Hub Opening
Insulation:
Glass Polyester
Line Side Wire Range:
4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
Main Breaker Size:
No Main Breaker
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
1 Phase
Product Height:
38.75 IN
Product Length:
4.844 IN
Product Size:
4.844L x 13W x38.75H
Product Type:
Ringless Meter Socket
Standards:
UL Listed;Type 3R
Unspsc Number:
39121102
Voltage Rating:
600 Volts Alternating Current
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
320
Product Width:
13 IN
Department:
Electrical
Product Subgroup:
Metering & Meter Sockets
Insulation Type:
Glass Polyester
Hub Style:
Large Hub Opening
Installation Category:
Surface Mount
Number of Phases:
1
Frequency:
60 hertz
Product Details:
Ringless Meter Socket
Product Group:
Power Distribution

Milbank U1779-R-K3-BLG – Frequently Asked Questions

1) Will a Milbank U1779-R meter socket work for a 320 amp overhead residential service?
That's exactly what the U1779-R is built for. It's a single-phase, 1-position ringless socket rated 320 continuous amperes at 600 volts AC, 60 Hz, with overhead cable entry through a large hub opening. The Type 3R enclosure is UL Listed for outdoor mounting, and it surface mounts to the wall. Note there's no main breaker in it, so the disconnect and overcurrent protection have to come from downstream gear.
2) What size service entrance conductors will land in a Milbank 320A ringless meter socket?
The line side terminals take 4 AWG through 600 kcmil, or two conductors per terminal from 1/0 AWG through 250 kcmil for parallel runs. That covers the usual 320 amp overhead service conductor sizes on either a single large conductor or a paralleled set. Verify the lug range against what the utility is dropping before you pull.
3) Does the lever bypass on this Milbank socket let me change a meter without killing power to the building?
Yes. The lever bypass in the U1779-R shunts the meter jaws so the meter can be pulled and swapped while load stays energized, which is why utilities and property managers spec bypass on larger residential and commercial services. It is a utility-facing feature, not a service disconnect, so it is not a substitute for opening the downstream main before working on the load side.
4) Which Milbank U1779-R configuration do I need, the 5 terminal 9 o'clock or the barrel lock ground version?
Two builds are offered. U1779-R-5T9 is the 5 terminal version with the fifth terminal at the 9 o'clock position, large hub open and lever bypass, which is what you order when the utility meters a 5-jaw socket for a network or specific single-phase arrangement. U1779-R-K3-BLG is the 320A 1-phase lever bypass build with barrel lock ground. Both share the same 320 amp single-phase rating, so the choice comes down to the jaw count and sealing arrangement your utility specifies.
5) Can I feed a 320 amp service underground into the Milbank U1779-R?
No. The U1779-R is configured for overhead cable entry with a large hub opening at the top for the service mast or hub fitting. For an underground lateral you want a socket built for underground entry with a closing plate rather than a hub opening. Ordering this one for a URD service means cutting into an enclosure that wasn't built for a bottom feed.
6) What else do I need to order to finish a 320 amp service with a Milbank U1779-R socket?
The socket is metering only. There's no main breaker and no receptacle in it, so the service disconnect and overcurrent protection come from separate downstream gear, typically two 200 amp panels or a 320 amp rated disconnect. You'll also need the hub or mast fitting to close the large hub opening for your conduit size, the grounding electrode conductor to land on the bonded ground strap, and the utility supplies the meter and the barrel lock.
7) What is the difference between a ringless meter socket and a ring-type socket, and which does my utility want?
A ringless socket like the Milbank U1779-R uses a one-piece cover that the utility seals directly, instead of a separate sealing ring clamping the meter to the socket. The two are not interchangeable in the field: the cover and the meter retention are different, so the utility's specification for your service territory decides it. Order the ringless version only if your serving utility lists ringless as the accepted style for a 320 amp single-phase overhead service.
8) How much wall space do I need for a Milbank U1779-R meter socket?
Plan on a footprint of 4.844 x 13 x 38.75 inches, with 38.75 inches being the height and 13 inches the width. It surface mounts, so you need a flat, structurally sound wall face and clearance in front for the meter, the bypass lever, and utility access to the seal.
9) Can this Milbank ringless socket be mounted outdoors on an exposed wall?
Outdoor mounting is what it's rated for. The enclosure is UL Listed Type 3R, which covers rain and sleet exposure on an exterior wall, and the body is G90 galvanized steel with a powder coat finish for corrosion resistance. Mount it upright as intended so the 3R drainage works.
10) Does the Milbank U1779-R come with a barrel lock provision for utility sealing?
It includes a 7/8 inch knockout and an angle bracket for a barrel lock provision, which is how most utilities secure a ringless cover. The barrel lock itself is supplied by the utility. If your territory requires the ground-side barrel lock arrangement specifically, the U1779-R-K3-BLG build is the one to order.
11) Is a grounding connection built into this 320A meter socket or do I have to add a ground bar?
A bonded ground strap is factory installed for the equipment grounding connection, so you land the grounding electrode conductor at the socket without adding a separate kit. The internal insulation is glass polyester, which handles the isolation between the live parts and the enclosure.
How fast can I get the Milbank U1779-R-K3-BLG delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Milbank U1779-R-K3-BLG come with a warranty?
Absolutely. The Milbank U1779-R-K3-BLG is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Milbank U1779-R-K3-BLG?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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