Electric Manhole Covers
Electric Manhole Covers
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Product Description
Electric Manhole Frame and Cover — Utility Castings Series
The Amercast Electric Manhole Frame and Cover is a purpose-built utility casting engineered for the specific demands of electrical infrastructure access — underground power distribution networks, high-voltage cable vaults, telecommunications conduit systems, and transit authority electrical rooms. Featuring a 41″ x 41″ square frame with a 30-inch round cover, this assembly is designed to span the larger structural openings required by electrical vault construction while providing the round cover geometry that makes access safe and efficient for utility crews working in traffic.
Cast from grey iron conforming to ASTM A48 Class 30B, this assembly delivers a minimum 30,000 psi tensile strength, long-term corrosion resistance, and the structural rigidity required for continuous roadway loading over electrical infrastructure. Rated AASHTO H-20, it is proof-load tested to meet the standard for vehicular traffic loading wherever electrical vaults sit beneath active roadways, sidewalks, or transit facilities.
The square frame / round cover configuration is the recognized standard for electrical utility access across major urban infrastructure systems. Amercast has supplied utility castings for projects serving the NYC Department of Transportation, the MTA, JFK Airport, and LaGuardia Airport — environments where electrical vault access castings must perform without failure under some of the heaviest and most continuous traffic loads in the country.
Product No. AC-MH-ELC. In stock. Custom markings and locking features available.
Why Square Frame, Round Cover
The square frame / round cover geometry is not arbitrary — it is the dominant engineering solution for electrical and telecommunications vault access for several reasons that matter to the engineers and utility contractors who specify this product.
The square frame maximizes structural bearing on the vault opening. Electrical vault openings are typically square or rectangular to accommodate cable routing, switchgear placement, and crew access requirements. A square frame distributes the cover load and traffic forces across all four sides of the vault wall, providing superior bearing area and stability compared to a round frame on the same opening geometry.
The round cover cannot fall in. A round cover is always wider than the clear opening in every orientation — it physically cannot be accidentally dropped into the vault below, regardless of how it is positioned during access operations. In electrical vault environments where energized equipment may be below the opening, this is a critical safety property recognized by OSHA and utility safety standards nationwide.
The 30-inch clear opening meets utility crew access requirements. At 30 inches, this assembly provides the clearance necessary for electrical workers to safely enter the vault with tools and equipment, meeting standard confined space entry requirements for utility vault access per applicable OSHA and NFPA standards.
The 7-inch frame height provides maximum bearing depth. At seven inches, this is one of the deepest frame heights in the Amercast manhole lineup — providing substantial frame mass, superior load distribution across the surrounding pavement structure, and the ability to accommodate deeper grade adjustments without requiring a separate riser ring in many applications.
Technical Specifications
Product No. — AC-MH-ELC Product Type — Manhole Frame and Cover, sold as a matched set Configuration — Square Frame, Round Cover Overall Frame Size (Square) — 41″ x 41″ Clear Opening Diameter — 30 inches Cover Outside Diameter — 31 15/16 inches Cover Thickness — 1 3/8 inches Frame Height — 7 inches Frame Seat Diameter — 34 inches Material — Grey Cast Iron Material Standard — ASTM A48 / A48M-03, Class 30B Load Rating — AASHTO H-20 Finish — Bituminous (black asphaltic) coating standard; raw unpainted available Markings — Plain or with custom markings available Locking — Locking features available; contact Amercast Custom Sizes — Available; contact Amercast sales Stock Status — In Stock
Key Features
- ASTM A48 Class 30B grey cast iron — 30,000 psi minimum tensile strength; the proven industry standard for load-bearing municipal and utility street castings with long-term corrosion resistance requiring no surface coating to maintain structural integrity
- AASHTO H-20 rated — meets the proof-load standard for vehicular traffic loading; suitable for roadway, transit, and urban utility vault installations beneath active traffic lanes, sidewalks, and transit facilities
- Square frame, round cover configuration — the recognized standard for electrical and telecommunications vault access; square frame maximizes structural bearing on vault opening geometry while round cover provides the critical safety property of being unable to fall through the clear opening in any orientation
- 41″ x 41″ overall frame footprint — sized to span the larger vault openings required by electrical infrastructure construction; compatible with standard precast concrete and cast-in-place vault construction used throughout the Northeast and Mid-Atlantic
- 30-inch clear opening — provides sufficient clearance for utility crew confined-space entry with tools and equipment per applicable OSHA and NFPA standards
- 7-inch frame height — the deepest standard frame height in the Amercast utility lineup; maximum bearing surface, superior load distribution, and deep grade accommodation
- 31 15/16-inch cover outside diameter / 34-inch frame seat diameter — precision-matched cover and seat geometry; factory-paired for stable, rattle-free seating under continuous traffic loading
- 1 3/8-inch cover thickness — substantial cover mass for structural rigidity and noise dampening under vehicle traffic
- Bituminous coating standard — black asphaltic finish provides corrosion resistance and meets municipal and utility appearance specifications; raw unpainted available for applications requiring alternate coatings or paint systems
- Custom markings available — ELECTRIC, CON EDISON, utility company name, or municipality identification cast into the cover face; no additional lead time for standard marking options
- Locking features available — bolted or locking cover configurations for security-sensitive electrical vault installations; contact Amercast for options
- In-stock availability — ready for same-day or next-business-day dispatch from the Amercast distribution network
Application Guide
Ideal for:
- Underground electrical power distribution vault access in roadway and sidewalk locations
- High-voltage cable vault access for utility companies including Con Edison, PSE&G, National Grid, and similar distribution operators in the Northeast
- Telecommunications and fiber conduit vault access where square vault openings and round covers are specified
- MTA, transit authority, and railroad right-of-way electrical infrastructure access
- Municipal electrical system access beneath streets, intersections, and pedestrian areas
- Airport electrical vault and ground power infrastructure access
- Any application where the square frame / round cover configuration is required by utility company specification or owner standard
Custom markings for electrical utility identification — ELECTRIC, HIGH VOLTAGE, or utility company name — are available cast directly into the cover face. Contact Amercast for marking options and lead times.
Need a locking cover for a secured electrical vault? Locking and bolted cover configurations are available on this assembly. Contact Amercast at 646-227-0910 or 516-624-8543 to discuss locking options for your specification.
Related Electric and Utility Manhole Covers
6″ x 32″ Manhole Frame and Cover Electric (https://amercast.com/product/6-x-32-manhole-frame-and-cover-electric/) — for applications requiring a 32-inch clear opening and 6-inch frame height on electrical vault installations; contact Amercast to confirm dimensional compatibility with your vault construction.
Pressure and Watertight Manhole Covers (https://amercast.com/product/pressure-and-watertight-manhole-covers/) — for electrical vault applications where infiltration prevention, gas-tight sealing, or low-pressure containment is required by the electrical utility specification or NFPA standard.
Access Hatches and Hinged Manhole Covers (https://amercast.com/product/access-hatches-and-hinged-manhole-covers/) — hinged cover configurations for electrical vault access where single-person operation is required; concealed and butt hinge options with lift-assist available.
Custom Manhole Covers (https://amercast.com/product/custom-manhole-covers/) — fully custom cover designs with utility company logos, municipal seals, or branded identification cast into the cover face; custom frame and cover sets available for non-standard vault opening geometries.
Explore the Complete Manhole Frame and Cover Lineup
Amercast stocks the full range of manhole frame and cover configurations for every municipal, utility, and infrastructure application. If this assembly does not match your specification, select from the complete lineup:
4″ x 24″ Manhole Frame and Cover (https://amercast.com/product/4-x-24-manhole-frame-and-cover/) — standard heavy duty municipal depth for sewer, stormwater, and utility access in 24-inch clear opening applications.
6″ x 24″ Manhole Frame and Cover (https://amercast.com/product/6-x-24-manhole-frame-and-cover/) — maximum frame height for deep-set 24-inch installations in high-traffic roadway applications.
4″ x 24″ Manhole Frame and Cover Locking Watertight (https://amercast.com/product/4-x-24-manhole-frame-and-cover-locking-watertight-2/) — gasket-sealed, bolted cover for infiltration prevention and pressure-tight performance.
6″ x 24″ Manhole Frame and Cover Locking Watertight (https://amercast.com/product/6-x-24-manhole-frame-and-cover-locking-watertight/) — maximum depth locking assembly for high-specification watertight installations.
6″ x 32″ Manhole Frame and Cover Electric (https://amercast.com/product/6-x-32-manhole-frame-and-cover-electric/) — 32-inch opening electrical vault cover for larger utility infrastructure.
Decorative Manhole Covers (https://amercast.com/product/decorative-manhole-covers/) — architectural and decorative cover designs for campus, pedestrian, and urban streetscape applications.
Browse the complete Manhole Frames and Covers catalog (https://amercast.com/product-category/manhole-frames-and-covers/)
Related Products for Your Project
Inlet Frames and Grates (https://amercast.com/product-category/inlet-frames-and-grates/) — curb and combination inlet castings for roadway stormwater collection on the same project.
Catch Basin Frames and Grates (https://amercast.com/product-category/catch-basin-frames-and-grates/) — stormwater inlet castings in 12″ through 24″ sizes for drainage infrastructure adjacent to utility work.
Manhole Risers (https://amercast.com/product-category/manhole-risers/) — cast iron grade rings for adjusting frame elevation during paving, reconstruction, and utility vault rehabilitation.
Valve Boxes (https://amercast.com/product-category/valve-boxes/) — cast iron valve access boxes for water main and gas distribution infrastructure often specified on the same utility contract.
Detectable Warning Plates (https://amercast.com/product-category/detectable-warning-plates/) — ADA-compliant tactile surface plates for pedestrian areas surrounding utility access structures.
Engineering and Material Standards (https://amercast.com/engineering/) — Amercast’s complete ASTM A48 and AASHTO M-306 compliance reference for submittals, specifications, and DOT approval packages.
About Amercast
American Cast Iron Products, Inc. has served the sewer, waterworks, and construction industries for over 27 years. With more than 1,000 specifications stocked across manhole covers, catch basins, inlet grates, valve boxes, trench drains, and more, Amercast is the single-source supplier trusted by contractors and engineers throughout the Northeast. We carry both domestic and import grey iron and ductile iron castings, giving you flexible options for Buy American compliance and project budget requirements.
For electrical utility contractors, transit authority project managers, and civil engineers sourcing castings for vault access on DOT and agency contracts — Amercast has the product knowledge, specification documentation, and inventory depth to support your submittal and get your project moving.
Questions about specifications, custom markings, locking options, or project availability? Call 516-624-8543
Request a Quote (https://amercast.com/contact/) — same-day response for in-stock items.
