Milbank 320A Single Phase Ring...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,029.53
Milbank 4 Terminal Ringless Meter Socket Plain Top Lever Bypass, 1 position 320 Ampere Single Connector Locking 4-600kcmil Double Connector Locking 6-350kcmil

Milbank 320A Single Phase Ringless Meter Socket with Lever Bypass Underground Entry

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Model: U1797-O-K3L-K2L-BLG

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

$1,029.53
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Milbank 320A Single Phase Ringless Meter Socket with Lever Bypass Underground Entry

Professional metering solution with integrated bypass capability

The Milbank 320A Single Phase Ringless Meter Socket delivers reliable electrical metering with integrated lever bypass functionality for underground service applications. Featuring robust G90 galvanized steel construction with powder coat finish and UL Listed Type 3R rating, this professional-grade meter socket provides dependable performance in demanding electrical service environments.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles high-capacity electrical loads with reliable current-carrying capability for demanding applications.
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without service interruption through integrated bypass switching.
  • Underground Cable Entry: Designed specifically for underground service connections with appropriate wire range accommodation.
  • G90 Galvanized Steel Construction: Provides superior corrosion resistance and long-term durability in outdoor installations.
  • UL Listed Type 3R Rating: Meets stringent safety standards for outdoor use with protection against weather conditions.
  • 4 Terminal Ringless Design: Simplifies installation with secure connections for line and load conductors without compression rings.
  • Glass Polyester Insulation: Delivers excellent electrical isolation and thermal performance for safe operation.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Underground
  • Departent: Electrical
  • Equipment Ground: 3 Barrel Ground Lug
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Plain Top
  • Insulation: Glass Polyester
  • Line Side Wire Range: 4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
  • Load Side Wire Range: Two 6 AWG - 350 kcmil
  • Number Of Jaws: 4 Terminal
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 1 Phase
  • Product Family Code: 4T32
  • Product Height: 30 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 15 IN

Professional Applications

  • Residential Underground Service Connections
  • Commercial Building Electrical Services
  • Multi-Unit Property Metering
  • Industrial Facility Power Distribution
  • Municipal and Utility Infrastructure
  • High-Amperage Service Installations

Why Choose Milbank Quality?

Milbank delivers proven reliability through UL Listed certification and Type 3R weather protection rating. The robust G90 galvanized steel construction with powder coat finish ensures long-term performance in demanding outdoor environments, while the comprehensive wire range compatibility and professional-grade components provide dependable electrical service for critical applications.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Underground
Equipment Ground:
3 Barrel Ground Lug
Frequency Rating:
60 Hertz
Hub Closing Plate:
Plain Top
Insulation:
Glass Polyester
Line Side Wire Range:
4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
Load Side Wire Range:
Two 6 AWG - 350 kcmil
Number Of Jaws:
4 Terminal
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
1 Phase
Product Family Code:
4T32
Product Height:
30 IN
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:
15 IN
Department:
Electrical
Product Subgroup:
Electrical
Insulation Type:
Glass Polyester
Hub Style:
Plain Top
Installation Category:
Surface Mount
Number of Phases:
1
Frequency:
60 hertz
Product Details:
Ringless Meter Socket
Number of Terminations:
4
Product Group:
Metering & Service Entrance

Milbank U1797-O-K3L-K2L-BLG – Frequently Asked Questions

1) Will a Milbank 320A ringless meter socket work for an underground service lateral, or do I need an overhead version?
Underground only. The U1797-O is built for underground cable entry and comes with a plain top hub closing plate, so there is no hub opening for overhead conduit or a service mast. If the service drop comes in from a pole, you want an overhead-entry socket with a hub opening instead. Line side lands 4 AWG to 600 kcmil on a single connector, or two conductors from 1/0 AWG to 250 kcmil, which covers the parallel sets typical on a 320A underground lateral.
2) Does the Milbank 320A meter socket have a main breaker in it, or do I still need a separate disconnect?
There is no breaker in it. The socket carries zero main breakers and zero receptacles, so it is a meter-only can. You still need a service disconnect downstream, and on a 320A residential service that is usually two 200A panels or a separate 400A-class disconnect fed from the load side. Load side lugs take two conductors each, 6 AWG to 350 kcmil, which is what lets you feed two panels directly out of the socket.
3) Can I feed two 200 amp panels from one Milbank 320A meter socket?
Yes, and that is the common use for it. The load side is landed on double connectors rated for two conductors from 6 AWG to 350 kcmil, so you can run a set to each of two panels out of the same can. It is a single meter position, single phase, so both panels meter through the one meter. Equipment grounding is a 3 barrel ground lug.
4) Is the Milbank U1797-O meter socket rated for outdoor mounting on an exterior wall?
Yes. It is UL Listed and rated Type 3R, which is the enclosure rating for outdoor use with protection against falling rain and sleet. The can is G90 galvanized steel with a powder coat finish and it is surface mount, so it bolts flat to an exterior wall or a meter board.
5) What is the difference between the barrel lock, hasp, and knockout lock options on the Milbank U1797-O?
Those are the sealing and locking provisions on the cover, and the utility usually dictates which one they will accept. U1797-O-K3L-K2L is the plain standard version. The -BL adds a 9/16 inch barrel lock provision and the -BLG a 7/8 inch barrel lock provision, both for utility barrel locks. The -HSP has a stainless steel hasp for a padlock. The -IL has 7/16 inch knockouts for a lock provision. Ask the serving utility which they seal with before you order, since the wrong provision means the meter does not get set.
6) Will a ringless meter socket work if my utility uses ring type sockets?
No. Ringless and ring type are not interchangeable, and the utility decides which they accept in their territory. The U1797-O is a ringless design with a 4 terminal jaw configuration, meaning the cover seals directly without a sealing ring around the meter. If your utility standard is ring type, this socket will not be approved for the set.
7) Can I use this Milbank socket on a 3 phase service?
No. This is a single phase, 4 terminal socket rated 600 volts AC at 60 Hz. Three phase metering needs a 7 jaw socket. The 4 jaw configuration here covers single phase 3 wire residential and light commercial services, including 120/240V and 120/208V single phase.
8) Will a 250 kcmil aluminum service conductor land in the Milbank U1797-O line lugs?
Yes. The line side takes a single conductor from 4 AWG up to 600 kcmil, or two conductors each from 1/0 AWG to 250 kcmil, so a single 250 kcmil sits well inside range and a parallel pair of 250s also lands. That parallel capability is what makes it workable on a 320A underground lateral where the conductors are run as two sets.
9) What does lever bypass do on a 320 amp meter socket, and do I need it?
Lever bypass lets the utility pull or swap the meter without dropping power to the building. Throwing the lever shunts current around the meter socket jaws so the load stays energized while the meter is out. Most utilities require bypass on 320A class self-contained sockets, and many require it on any commercial or multi-unit service where an outage to change a meter is not acceptable. Check what your serving utility has approved, because the bypass type is a utility spec, not an installer preference.
10) How much wall space do I need for the Milbank 320A ringless socket?
The enclosure is 30 inches high and 15 inches wide. Lay that out before you set the can, because on an underground service you also need room below for the conduit sweep and above for the required meter center height your utility calls for.
11) What is the double line stud bar version of the Milbank 320A socket for?
The U1797-O-STU-STU replaces the mechanical lug connectors with stud bars on both line and load. You use it when the utility or the design calls for bolted terminations rather than set screw lugs, typically where compression lugs get landed on studs. If you are landing bare conductors under set screws, take the standard K3L-K2L version instead.
12) Is a 320 amp continuous meter socket the same thing as a 400 amp socket?
They are the same class of equipment described two ways. This one is rated 320 continuous amperes, which is the continuous rating on a socket commonly sold as 400 amp class. Utilities and inspectors generally refer to a 320A continuous self-contained socket when the service is called a 400 amp residential service. Do not read the 320 figure as a smaller socket than what a 400 amp service calls for.
13) What Milbank part number do I give the utility for approval on a 320A underground ringless socket with lever bypass?
The base catalog number is U1797-O-K3L-K2L, in the Milbank 4T32 product family. Add the suffix for the sealing provision the utility requires: BL for a 9/16 inch barrel lock, BLG for 7/8 inch, HSP for a stainless steel hasp, or IL for 7/16 inch knockouts. Submit the full number with the suffix, because the utility approves the exact configuration.
14) What insulation is used in the Milbank 320A socket and does it hold up in hot climates?
The jaw and bypass assembly is insulated with glass polyester, which is the standard thermoset used in high amperage meter sockets for its dielectric and thermal performance. Paired with the Type 3R galvanized enclosure, it is built for continuous outdoor duty at the 320 amp continuous rating.
How fast can I get the Milbank U1797-O-K3L-K2L-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 U1797-O-K3L-K2L-BLG come with a warranty?
Absolutely. The Milbank U1797-O-K3L-K2L-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 U1797-O-K3L-K2L-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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