Milbank 320 Amp 1 Phase Ringle...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$743.93
Milbank 4 Terminal Ringless Meter Socket Plain Top Lever Bypass Side Bussed, 1 Position, 320 Ampere

Milbank 320 Amp 1 Phase Ringless Meter Socket with Lever Bypass Underground Entry

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Model: U1129-O-5T9

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

$743.93
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Milbank 320 Amp 1 Phase Ringless Meter Socket with Lever Bypass Underground Entry

Professional metering solution with integrated bypass capability

The Milbank 320 Amp 1 Phase Ringless Meter Socket delivers reliable electrical metering with convenient lever bypass functionality for underground service applications. Constructed with G90 galvanized steel and powder coat finish, this UL Listed Type 3R enclosure provides durable performance in demanding environments. The single position design accommodates 320 continuous ampere service with glass polyester insulation and comprehensive grounding provisions.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles high-capacity electrical loads for demanding residential and commercial applications
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without service interruption
  • 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: Ensures compliance with safety standards and weather resistance for outdoor applications
  • Glass Polyester Insulation: Delivers reliable electrical isolation and performance in varying environmental conditions
  • 3 Barrel Ground Lug: Provides secure equipment grounding for enhanced electrical safety

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
  • 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: 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

  • High-capacity residential electrical service installations
  • Commercial building electrical metering systems
  • Multi-unit residential properties requiring individual metering
  • Industrial facilities with underground electrical service
  • Utility company metering infrastructure projects
  • Electrical contractor service upgrade applications

Why Choose Milbank Quality?

Milbank meter sockets provide dependable electrical metering solutions backed by UL Listed certification and Type 3R weather resistance rating. The robust G90 galvanized steel construction with powder coat finish ensures long-term performance in challenging outdoor environments, while comprehensive grounding provisions and glass polyester insulation deliver reliable electrical safety and operational integrity.

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
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:
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
Product Details:
Ringless Meter Socket
Frequency:
60 hertz

Milbank U1129-O-5T9 – Frequently Asked Questions

1) What size conductors can I land on the Milbank 320 amp lever bypass socket?
Line side lugs take 4 AWG through 600 kcmil, or two conductors of 1/0 AWG through 250 kcmil in parallel. Load side is dual: two conductors from 6 AWG through 350 kcmil, which is what lets you feed two panels or a 200/200 split off one 320 amp service. Equipment grounding is a 3 barrel ground lug.
2) Can I use this Milbank socket for an overhead service drop?
No. The U1129-O is built for underground service entry and ships with a plain top, meaning no hub opening for a weatherhead riser. For an overhead drop you want the hub top version of the same 320 amp lever bypass socket instead.
3) My utility requires a 5th terminal for the neutral sensing. Does Milbank make this socket that way?
Yes, the U1129-O family includes a 5th terminal version in the 9 o'clock position (U1129-O-5T9). There is also an Ameren approved build, U1129-O-K3L-K2L-5T6-AMS, which carries a 5th terminal in the 6 o'clock position along with locking connectors. Check which clock position your serving utility specifies before ordering, since the two are not interchangeable.
4) What does lever bypass do on a meter socket, and do I need it?
The lever bypass lets a utility tech or electrician shunt current around the meter so the meter can be pulled and changed without dropping power to the building. Many utilities require bypass on 320 amp class sockets. If your utility does not, a non-bypass socket costs less and has fewer moving parts, but it means a service outage every time the meter comes out.
5) Is the Milbank U1129-O rated for outdoor wall mounting?
Yes. It is a UL Listed Type 3R enclosure, which is the rain and sleet tight rating used for exterior service equipment. The shell is G90 galvanized steel with a powder coat finish, and it surface mounts to the wall.
6) How much wall space do I need for this 320 amp Milbank meter socket?
Plan on 30 inches of height and 15 inches of width for the enclosure body, plus working clearance in front per code and whatever your utility requires for meter height off finished grade.
7) What is the difference between the plain U1129-O and the K3L-K2L version?
The K3L-K2L build uses locking connectors: a single locking connector rated 4 to 600 kcmil on the line and double locking connectors rated 6 to 350 kcmil on the load, in a top facing socket arrangement. Some utilities mandate locking type connectors. The straight U1129-O carries the standard lugs with the same wire ranges.
8) Can I get this Milbank socket with a lockable hasp or approved for DTE?
Two specific builds cover those needs. U1129-O-K3L-K2L-HSP adds a stainless steel hasp on the locking connector version for padlocking the cover. U1129-O-DTE is the Detroit Edison utility build. Utility approved versions are not generic, so order the one your serving utility has on its accepted list.
9) Is a ringless meter socket the same as a ring type socket?
No, and the covers are not interchangeable. A ringless socket like the U1129-O uses a full length hinged or lift off cover that the utility seals directly, with no separate sealing ring around the meter. Ring type sockets use a short cover plus a locking ring. Most utilities specify one style or the other for their territory.
10) Can I meter two apartments from this Milbank socket?
No. It holds one meter position only, so it serves a single metered account. Multi unit buildings that need individual metering require a multi position socket or a meter stack, one position per tenant.
11) Does the Milbank U1129-O include any breakers or receptacles?
No. It is a bare metering can: zero main breakers, zero receptacles, one meter position. Insulation is glass polyester. If you need integrated overcurrent protection at the meter, you want a meter main combination rather than this socket.
How fast can I get the Milbank U1129-O-5T9 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 U1129-O-5T9 come with a warranty?
Absolutely. The Milbank U1129-O-5T9 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 U1129-O-5T9?
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
Why buy the Milbank U1129-O-5T9 from ZenSupply?
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