Hydel E400RO | 4 Jaw Meter Socket | 200A | 600V | Isolated Capable | Combination OH/UG

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Description

Ontario Meter Base • Hydel E400RO

Hydel E400RO 200A Combination Meter Socket with Isolated Neutral Capability | 4 Jaw

The Hydel E400RO is a 200 amp, 600 volt, 4-jaw combination overhead/underground meter socket designed for utility-facing residential and light commercial service installations. This model uses straight lugs on the line side, supports a No. 6–250 MCM CU/AL conductor range, and offers isolated neutral capability through the Hydel INK200 insulated neutral accessory for Ontario projects where that configuration is preferred.

200A 600V OH / UG Combination 4 Jaw Straight Lugs INK200 Capable

⚠️ Isolated Neutral Preference in Ontario

On Ontario jobs, utilities often prefer the neutral to be isolated from the meter-mounting device on applicable models. The Hydel E-series supports the INK200 insulated neutral accessory, which makes the E400RO relevant where isolated neutral configuration may be required by the service design, utility guide, or inspector.

  • Hydro One gives preference to isolating the neutral from the meter-mounting device on applicable models.
  • The E-series supports INK200 insulated neutral as a field-adaptable accessory.
  • Final approval depends on the exact SKU, installed configuration, utility requirements, and inspection method.
Always confirm the exact meter-base configuration, grounding method, and utility acceptance before installation and energization.

🔌 Combination OH / UG Design

Designed for combination overhead and underground service entry applications, making it suitable for a wider range of field conditions than a single-entry-only base.

🧰 Hydel INK200 Capability

The E-series supports the INK200 insulated neutral accessory, helping contractors configure the meter base appropriately where isolated neutral treatment is preferred or required.

📐 Straight Lug Design

Built with straight lugs on the line side, making it distinct from EK-series barrel-connector models and easier to identify for the correct application.

Hydel E400RO Meter Socket Overview

The Hydel E400RO is a 200A combination overhead/underground meter socket for service entrance applications where a 4-jaw, 600V, single-position meter base with straight lugs on the line side is required. It is especially relevant for Ontario contractors looking for a Hydel combination meter base that can support isolated-neutral configuration through the INK200 insulated neutral accessory.


Common buying phrases for this unit include Hydel E400RO, 200A combination meter socket, overhead underground meter base, Hydel 4 jaw meter socket, Ontario 200A meter base, and isolated neutral capable meter base.


  • Ideal for projects requiring combination overhead / underground entry
  • Useful where straight line-side lugs are preferred
  • Supports isolated-neutral-capable configuration through Hydel INK200
  • Suitable for electricians, builders, and electrical wholesalers in Ontario
What is INK200?

For Ontario applications where isolated neutral configuration is preferred, the Hydel E-series supports the INK200 insulated neutral accessory. Hydro One guidance gives preference to isolating the neutral from the meter-mounting device on applicable models, while final grounding and bonding treatment must match the installed service design and inspection requirements.

Technical Specifications

Specification Details
Manufacturer Hydel
Model E400RO
Type Combination overhead / underground meter socket
Amperage Rating 200A
Voltage Rating 600V
Jaw Configuration 4 Jaw
Connection Type Straight lugs on line side
Conductor Range No. 6 – 250 MCM CU/AL
Enclosure CSA enclosure 3R
Dimensions 18" H x 12" W x 4-3/4" D
Weight 15 lbs
Accessory Option INK200 insulated neutral (field adaptable)
Application Combination OH / UG service entrance

Typical Applications

  • Residential service entrances
  • Combination OH / UG service configurations
  • Utility-facing meter installations
  • Ontario contractor supply and replacement jobs

Why Contractors Choose This Model

  • Hydel brand familiarity in Ontario
  • Combination service entry flexibility
  • Straight lug line-side design
  • Supports insulated-neutral configuration with INK200

Hydel E400RO vs Related Hydel Models

The main practical differences between Hydel’s 200A meter-base families come down to service-entry type, lug style, enclosure format, and whether the application is combination OH/UG or underground-only.

Feature E400RO EK400RO MSC400TW
Type Combination OH / UG Combination OH / UG Underground only
Line-Side Connection Straight lugs Barrel connectors at 45° 1/2" compression studs
Enclosure Style Standard family format Oversize enclosure Underground socket enclosure
Isolated Neutral Support INK200 capable INK200 capable Isolated-neutral-focused application
Typical Use Combination service entry Combination service entry with oversize enclosure Underground service entrance
Choose E400RO when the job calls for a 200A combination OH/UG meter base with straight lugs on the line side rather than barrel connectors or underground-only construction.
Need the oversize enclosure version?

If your project requires a combination meter socket with an oversize enclosure and barrel-type line connectors, view the Hydel EK400RO meter socket .

Need an underground isolated-neutral model?

For Ontario underground service installations, see the Hydel MSC400TW or Hydel MSC400TW3 .

Downloads & Resources

Use the resources below to review Hydel product-family references, utility acceptance guidance, and related meter-base options.

What the Hydel catalogue confirms

  • 200A, 600V, 4-jaw E400RO configuration
  • Straight lugs on line side
  • 18" x 12" x 4-3/4" dimensions and 15 lb weight
  • INK200 insulated neutral as a field-adaptable accessory

What Hydro One confirms

  • Preference for isolating the neutral on applicable models
  • Unlisted models may still be installed if they meet Hydro One requirements
  • Final acceptance depends on exact model and installation details
  • Utility and inspection requirements must still be checked before use

Frequently Asked Questions

What is the Hydel E400RO used for?
The Hydel E400RO is a 200A, 600V, 4-jaw combination overhead/underground meter socket used for utility-facing service entrance applications.
Does the E400RO support isolated neutral?
The E-series supports Hydel INK200 insulated neutral as a field-adaptable accessory. That means the E400RO can be positioned as having isolated neutral capability, but the final installed configuration should be confirmed for the exact job.
Is the E400RO an overhead or underground meter base?
It is a combination OH / UG design, meaning it is used for both overhead and underground entry configurations.
What conductor range does the E400RO support?
Hydel lists the conductor range as No. 6 to 250 MCM copper or aluminum.
How is E400RO different from EK400RO?
The E400RO uses straight lugs on the line side, while the EK400RO is commonly referenced with barrel-type line connectors angled at 45° and an oversize enclosure format.

Contractor Pricing for Meter Bases & Service Entrance Products

Working on a residential, utility-facing, or electrical service project in Ontario? Contact MarsLED for contractor pricing, sourcing support, and meter-base supply across Ontario and Canada.

Explore More Electrical Service Products

MarsLED supplies meter bases and service entrance products to electricians and contractors across Toronto, Mississauga, Brampton, Vaughan, Hamilton, Milton, Kitchener-Waterloo, Cambridge, London, Ottawa, Barrie, Kingston and across Ontario.

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