Milbank 6 Terminal Ringless Me...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$822.67
$771.25
Milbank UC4964-O-WC-21-NST 6 Terminal Ringless Plain Top Test Switch Prewired Nstar Massachusetts

Milbank 6 Terminal Ringless Meter Socket 20A 1 Phase 600V with Plain Top Test Switch

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Model: UC4964-O-WC-21-NST

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

$822.67
$771.25
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Milbank 6 Terminal Ringless Meter Socket 20A 1 Phase 600V with Plain Top Test Switch

Professional Meter Socket Solution for Massachusetts Nstar Applications

The Milbank 6 Terminal Ringless Meter Socket delivers reliable single-phase electrical metering with 20 continuous ampere rating and 600V AC capacity. Featuring G90 galvanized steel construction with powder coat finish and Type 3R enclosure rating, this surface-mount meter socket provides durable performance for underground cable entry applications with glass polyester insulation and ground lug equipment grounding.

Professional Features & Benefits

  • 20 Continuous Ampere Rating: Provides reliable current handling capacity for residential and light commercial metering applications.
  • 600V AC Voltage Rating: Supports standard electrical service voltages with single-phase configuration for versatile installation compatibility.
  • G90 Galvanized Steel with Powder Coat Finish: Delivers superior corrosion resistance and long-lasting durability in outdoor environments.
  • Type 3R Enclosure Rating: Ensures protection against rain, sleet, and ice formation for reliable outdoor operation.
  • 6 Terminal Ringless Design: Facilitates secure electrical connections without ring terminals for simplified installation and maintenance.
  • UL Listed Certification: Meets rigorous safety and performance standards for professional electrical installations.
  • Plain Top Test Switch: Enables convenient testing and service access while maintaining secure meter socket operation.

Technical Specifications

  • Amperage Rating: 20 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: No Bypass
  • Cable Entry: Underground
  • Departent: Electrical
  • Equipment Ground: Ground Lug
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Plain Top
  • Insulation: Glass Polyester
  • Line Side Wire Range: 12 - 10 AWG
  • Load Side Wire Range: 12 - 10 AWG
  • Main Breaker Size: No Main Breaker
  • Number Of Jaws: 6 Terminal
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 1 Phase
  • Product Family Code: CT20
  • Product Height: 20 IN
  • Product Length: 5.125 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 5.125L x 12W x20H
  • Product Type: Ringless Meter Socket
  • Special Features: Nstar Massachusetts
  • Standard: UL Listed;Type 3R
  • Terminal: Single Mechanical
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 12 IN

Professional Applications

  • Residential Electrical Service Metering
  • Light Commercial Facilities
  • Multi-Unit Properties
  • Massachusetts Nstar Utility Requirements
  • Underground Service Installations
  • Single-Phase Electrical Systems
  • Professional Electrical Contractor Projects

Why Choose Milbank Quality?

Milbank delivers proven reliability with UL Listed certification and Type 3R weather protection. The G90 galvanized steel construction with powder coat finish ensures long-term durability, while the glass polyester insulation and ground lug equipment grounding provide safe, code-compliant electrical connections for professional installations.

Manufacturer Resources

Product Specs

Amperage Rating:
20 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
No Bypass
Cable Entry:
Underground
Equipment Ground:
Ground Lug
Frequency Rating:
60 Hertz
Hub Closing Plate:
Plain Top
Insulation:
Glass Polyester
Line Side Wire Range:
12 - 10 AWG
Load Side Wire Range:
12 - 10 AWG
Main Breaker Size:
No Main Breaker
Number Of Jaws:
6 Terminal
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
1 Phase
Product Family Code:
CT20
Product Height:
20 IN
Product Length:
5.125 IN
Product Size:
5.125L x 12W x20H
Product Type:
Ringless Meter Socket
Special Features:
Nstar Massachusetts
Standards:
UL Listed;Type 3R
Terminal:
Single Mechanical
Unspsc Number:
39121102
Voltage Rating:
600 Volts Alternating Current
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
20
Product Width:
12 IN
Department:
Electrical
Product Subgroup:
Electrical
Product Group:
Metering & Service Entrance

Milbank UC4964-O-WC-21-NST – Frequently Asked Questions

1) Will the Milbank UC4964-O-WC-21-NST meter socket meet Nstar requirements in Massachusetts?
That's exactly what it's built for. The UC4964-O-WC-21-NST is specified for Nstar Massachusetts service, in the 6 terminal ringless configuration with a plain top and a test switch. If your utility is a different one, confirm their approved socket list before ordering, because ringless versus ring type and the test switch requirement are set by the serving utility, not by the installer.
2) Is this Milbank 6 terminal socket a 20 amp instrument transformer rated socket, not a 200A self-contained one?
It's a 20 continuous ampere socket, which is a transformer rated (CT) socket, not a self-contained service socket. The CT20 family code and the 12 to 10 AWG line and load side wire ranges tell the same story: the wires landing in this can are metering leads from a current transformer cabinet, not service conductors. If you're metering a 200A residential service directly, this is the wrong device.
3) What size wire lands in the terminals on the Milbank CT20 meter socket?
Both line and load side terminals take 12 to 10 AWG, on single mechanical lugs. That's the standard range for CT secondary and potential leads. Anything heavier than 10 AWG will not land, so if your CT cabinet was pulled with larger conductors you'll need to transition before the socket.
4) Does the Milbank UC4964-O-WC-21-NST have a plain top or a hub for conduit entry?
Plain top, and the socket is set up for underground cable entry. There's no factory hub in the top, so a service coming down from an overhead run or a top conduit stub means drilling and adding a hub or picking a hub top version instead. For an underground lateral coming up into the bottom, it's ready as shipped.
5) Is there a main breaker or a meter bypass in this Milbank socket?
Neither. The UC4964-O-WC-21-NST has no main breaker and no bypass provision, so overcurrent protection has to live somewhere else in the service, and pulling the meter interrupts metering with no lever bypass to keep the load fed. What it does have is a test switch, which is how the utility takes readings and isolates the CT circuit without disturbing the meter.
6) Will a 6 jaw socket work for my three phase service, or do I need a different meter socket?
6 jaws does not automatically mean three phase. The UC4964-O-WC-21-NST is a 1 phase, 600V AC, 60 Hz single position socket, and the 6 terminal count here reflects the transformer rated metering connections rather than a three phase service. For a three phase transformer rated installation, order a socket specified as 3 phase for your utility.
7) How much wall space do I need for the Milbank UC4964 meter socket?
Plan on 5.125 x 12 x 20 inches overall, surface mounted. Height is the 20 inch figure and width the 12 inch, so it needs a clear 20 inch vertical run on the wall plus working clearance in front of the meter and test switch.
8) Can this Milbank ringless meter socket be mounted outdoors?
Yes, it's a Type 3R enclosure and UL Listed, so it's rated for outdoor use against rain, sleet and ice. The body is G90 galvanized steel with a powder coat finish. Type 3R is not dust tight or washdown rated, so for a corrosive or hosed down environment you want a different enclosure type.
9) Is this Milbank socket good for a multi-unit building where I need several meters?
One meter only. This is a single position socket, one tenant or one service per can. A multi-family building needs either one of these per metered service or a multi-position meter stack, which is a different product entirely.
10) What is a ringless meter socket and how is it different from a ring type?
On a ringless socket the cover itself locks the meter in place and the utility seals the cover, instead of a separate sealing ring clamping around the meter rim. The UC4964-O-WC-21-NST is the ringless style with a plain top. Which one you can install is dictated by the serving utility, and the two are not interchangeable, so a ringless can with a ring type cover on the truck gets you nowhere.
11) How do I bond the equipment ground in the Milbank UC4964 meter socket?
A ground lug is provided in the can for the equipment grounding conductor. The internal insulation is glass polyester, which is what isolates the live terminals from the galvanized steel enclosure, so the lug is the intended bonding point rather than any random screw in the back panel.
How fast can I get the Milbank UC4964-O-WC-21-NST 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 UC4964-O-WC-21-NST come with a warranty?
Absolutely. The Milbank UC4964-O-WC-21-NST 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 UC4964-O-WC-21-NST?
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 UC4964-O-WC-21-NST from ZenSupply?
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