+---
+title: Utility Manholes and Handholes
+category: Electrical
+toc_depth: 3
+description: >
+ When to use: Selecting and specifying below-grade access structures for underground electrical and low-voltage systems -- precast concrete manholes (personnel-entry), precast concrete handholes/vaults, and polymer-concrete or composite handholes serving medium-voltage feeders, low-voltage distribution, lighting circuits, and communications/data ductbanks. Covers ductbank pull points, cable splice and termination locations, inspection access, cover and frame assemblies, load/tier ratings, cover markings, sumps and drainage, grounding/bonding attachments, pulling irons, and cable rack inserts.
+ Not intended for: Underground conduit/ductbank routing, trench design, and concrete encasement (see [[sync/underground-ductbank]]); conduit and raceway material, fittings, and methods (see [[sync/raceways-and-conduit]]); conductors, cables, splices, and cable tray (see [[sync/conductors-and-cables]]); broader storm/sanitary/water/gas main coordination (see [[sync/site-utilities]]); above-grade pull, junction, and outlet boxes; AASHTO bridge-loaded roadway manholes; and wet-well or sump-pump drainage structures.
+---
+
+# Scope {toc}
+
+## This standard covers the design, selection, and specification of below-grade access structures for underground electrical power distribution and telecommunications/low-voltage systems on commercial, institutional, industrial, and site-utility projects. {note}
+
+## The structure types addressed are personnel-entry precast concrete manholes, hand-access precast concrete handholes and vaults, and polymer-concrete or fiberglass composite handholes, together with their cover and frame assemblies, sump and drainage provisions, grounding and bonding attachments, pulling irons, and cable rack inserts. {note}
+
+## These structures serve as ductbank pull points, cable splicing and termination locations, and inspection access points for medium-voltage feeders, low-voltage distribution, lighting circuits, and communications/data systems, including mixed-use underground duct systems. {note}
+
+## The distinction between a manhole and a handhole is access, not merely size. {note}
+
+## A manhole is sized and rated for personnel to physically enter and work inside it; this makes it a permit-required confined space and triggers working-clearance, ventilation, and access requirements. A handhole (also called a vault when of larger plan dimension) permits hand access from grade for pulling and splicing but is never entered by personnel. The selection between the two is driven by cable volume, the need for in-structure splicing or terminations, and maintenance frequency. {note}
+
+## The following are outside the scope of this standard. {note}
+
+- Underground conduit and ductbank routing, trench design, and concrete encasement -- see [[sync/underground-ductbank]].
+- Conduit and raceway material selection, fittings, and installation methods -- see [[sync/raceways-and-conduit]].
+- Conductors, cables, splicing methods and materials, and cable tray -- see [[sync/conductors-and-cables]].
+- Broader site utility coordination for storm, sanitary, water, and gas mains -- see [[sync/site-utilities]].
+- Above-grade pull boxes, junction boxes, and outlet boxes mounted on walls or in ceilings, which are governed by NEC Article 314 but are not the subject of this standard.
+- Traffic-signal or roadway manholes with structural bridge-loading requirements beyond H-20, which fall under AASHTO/civil scope.
+- Wet-well or sump-pump structures for drainage systems, which are mechanical/plumbing scope.
+
+# Referenced Standards {toc}
+
+## Equipment, materials, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
+
+## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+## ANSI/SCTE 77 tier nomenclature (Tier 8, Tier 15, Tier 22) is the dominant load-rating language for polymer-concrete and composite handholes in the US market; for precast concrete structures, AASHTO H-10/H-20/HS-20 loading is the equivalent reference. Both rating systems are cross-referenced in this standard to avoid confusion. {note}
+
+| Standard | Title |
+|----------|-------|
+| NFPA 70 (NEC) Article 314 | Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures |
+| NFPA 70 (NEC) Article 110.26 | Spaces About Electrical Equipment (working clearances) |
+| NFPA 70 (NEC) Article 110.31 / 110.34 | Enclosures for Electrical Installations and Working Space (Over 1000 V) |
+| NFPA 70 (NEC) Article 250 | Grounding and Bonding |
+| NFPA 70 (NEC) Article 300.3 | Conductors (general installation and segregation) |
+| ASTM C478/C478M | Circular Precast Reinforced Concrete Manhole Sections |
+| ASTM C857 | Minimum Structural Design Loading for Underground Precast Concrete Utility Structures |
+| ASTM C858 | Underground Precast Concrete Utility Structures |
+| AASHTO M199 | Precast Reinforced Concrete Manhole Sections |
+| ANSI/SCTE 77 | Specification for Underground Enclosure Integrity |
+| NEMA 250 | Enclosures for Electrical Equipment (1000 Volts Maximum) |
+| ASTM A48 | Gray Iron Castings |
+| ASTM A536 | Ductile Iron Castings |
+| IEEE 80 | Guide for Safety in AC Substation Grounding |
+| OSHA 29 CFR 1910.146 | Permit-Required Confined Spaces |
+
+# Submittals {toc}
+
+## Action Submittals {toc}
+
+### The Contractor shall submit the following action submittals for review and approval before fabrication or delivery:
+
+- Product data for each manhole, handhole, and vault type, including dimensions, wall thickness, weight, and load/tier rating.
+- Product data for each cover and frame assembly, including casting material, clear opening, weight, locking provisions, and cast legend.
+- Shop drawings showing plan and section views, knockout/duct-entry locations and sizes, sump and drain details, and grade-adjustment provisions.
+- Shop drawings showing the location, type, and rated capacity of all pulling irons, pulling eyes, and cast-in inserts.
+- Shop drawings showing cable rack standoff insert locations, spacing, and the rack and arm system to be furnished.
+- Structural design calculations sealed by a professional engineer, demonstrating compliance with the specified load/tier rating per ASTM C857 or ANSI/SCTE 77.
+- A grounding and bonding plan showing the bonding of metallic covers, frames, pulling irons, and cable racks and the connection to the system grounding electrode.
+
+```datasheet
+label: Action Submittals
+type: checkbox
+options:
+ - Structure product data (dimensions, weight, rating)
+ - Cover and frame product data (material, opening, legend)
+ - Shop drawings (plan/section, duct entries, sump)
+ - Pulling iron/eye locations and capacities
+ - Cable rack insert layout and rack system
+ - Sealed structural design calculations
+ - Grounding and bonding plan
+default:
+ - Structure product data (dimensions, weight, rating)
+ - Cover and frame product data (material, opening, legend)
+ - Shop drawings (plan/section, duct entries, sump)
+ - Sealed structural design calculations
+ - Grounding and bonding plan
+```
+
+## Informational Submittals {toc}
+
+### The Contractor shall submit the following informational submittals:
+
+- Certified proof-load test reports for composite and polymer-concrete enclosures and covers per ANSI/SCTE 77.
+- Certified concrete compressive-strength test reports for precast concrete structures.
+- Manufacturer's confined-space and rigging/lifting instructions for personnel-entry manholes.
+- Source quality-control certifications showing compliance with ASTM C478, ASTM C858, or AASHTO M199 as applicable.
+
+```datasheet
+label: Informational Submittals
+type: checkbox
+options:
+ - ANSI/SCTE 77 proof-load test reports
+ - Concrete compressive-strength test reports
+ - Confined-space and rigging instructions
+ - Source QC / material certifications
+default:
+ - ANSI/SCTE 77 proof-load test reports
+ - Concrete compressive-strength test reports
+ - Source QC / material certifications
+```
+
+## Closeout Submittals {toc}
+
+### The Contractor shall submit the following closeout submittals before final acceptance:
+
+- Record drawings showing the as-built location, structure designation, invert elevations, and rim elevation of each installed structure.
+- A structure schedule listing each structure's identification number, type, rating, and the circuits or systems routed through it.
+- Operation and maintenance data, including drainage, grounding test results, and cover-hardware torque values.
+
+```datasheet
+label: Closeout Submittals
+type: checkbox
+options:
+ - As-built record drawings (locations, inverts, rim)
+ - Structure schedule (ID, type, rating, circuits)
+ - O&M data and grounding test results
+default:
+ - As-built record drawings (locations, inverts, rim)
+ - Structure schedule (ID, type, rating, circuits)
+ - O&M data and grounding test results
+```
+
+# Quality Assurance {toc}
+
+## Precast concrete manhole sections shall be produced in a plant certified for the production of precast concrete utility structures.
+
+## Composite and polymer-concrete enclosures shall be proof-load tested to the specified ANSI/SCTE 77 tier before shipment, and certified test reports shall be furnished.
+
+## The structural designer of each personnel-entry manhole shall be a professional engineer licensed in the jurisdiction of the project.
+
+## A single manufacturer shall furnish each structure complete with its matching cover and frame assembly so that load ratings are coordinated as a system. {note}
+
+## Mixing a third-party cover or frame onto a structure body can defeat the certified tier rating, because the rating is established for the body and lid as a tested assembly. Furnishing matched components from one source preserves the certified rating and assigns single-source responsibility for fit and performance. {note}
+
+## Personnel-entry manholes are permit-required confined spaces and shall comply with OSHA 29 CFR 1910.146.
+
+## Confined-space provisions -- ventilation access, fixed or portable ladder access, and rescue retrieval -- shall be coordinated among the electrical, structural, and safety disciplines and reflected in the structure design.
+
+# Environmental and Service Conditions {toc}
+
+## Below-grade structures are continuously exposed to a wet, corrosive, and load-bearing environment, and the design basis must state the conditions the structure is built to withstand. {note}
+
+## The governing service conditions are the surface load above the structure, the groundwater regime (high water table, periodic flooding, or dry), soil corrosivity and chemistry, and frost depth. Each of these drives a distinct design decision: load determines the tier/structural rating, groundwater determines the drainage and watertightness approach, corrosivity determines material selection, and frost depth determines minimum cover and grade-ring detailing. {note}
+
+## Each structure shall be rated for the surface loading imposed at its final installed location, accounting for the finished paving and traffic plan and not the interim site condition.
+
+## The design shall account for the maximum groundwater elevation anticipated at each structure location.
+
+## Where the soil or groundwater is corrosive, composite, fiberglass, or polymer-concrete structures should be selected in preference to metallic enclosures, and ferrous hardware should be galvanized or stainless.
+
+```datasheet
+label: Maximum Groundwater Elevation Relative to Structure
+type: select
+options:
+ - Below structure floor (dry)
+ - At or near floor (seasonal)
+ - Above floor (submerged / high water table)
+default: At or near floor (seasonal)
+```
+
+```datasheet
+label: Frost Depth (Minimum Cover to Top of Structure)
+type: range
+unit: in
+min: 0
+max: 60
+step: 6
+default: 36
+drawing_ref: true
+```
+
+```datasheet
+label: Soil/Groundwater Corrosivity
+type: select
+options:
+ - Non-corrosive
+ - Moderately corrosive
+ - Severely corrosive (chlorides/sulfates)
+default: Non-corrosive
+```
+
+# Structure Type and Load Rating {toc}
+
+## Structure type and load rating are the two decisions that drive every downstream selection, and they must be made together because the available type/rating combinations are not unlimited. {note}
+
+## A polymer-concrete or composite handhole is light, fast to set, and ideal for low-voltage and telecommunications pull points, but it is not a personnel-entry structure and the highest readily available composite tier is Tier 22. A precast concrete manhole is the choice wherever personnel must enter to splice or terminate medium-voltage cable, and it is also the structure that most readily achieves AASHTO HS-20 heavy-traffic ratings. The decision flow is: determine whether personnel entry is required, then determine the surface load, then select the type that satisfies both. {note}
+
+## Structure Type Selection {toc}
+
+### The structure type shall be selected based on whether personnel entry is required, the cable volume, and the need for in-structure splicing or terminations.
+
+### A personnel-entry precast concrete manhole shall be provided wherever medium-voltage cable splicing, terminations, or equipment requiring working clearances are located within the structure.
+
+### Personnel-entry manholes containing medium-voltage conductors or equipment shall provide the working clearances and access required by NEC Article 110.31 and 110.34.
+
+### A hand-access handhole or vault may be provided where the structure functions only as a pull point or low-voltage splice location and no personnel entry is required.
+
+```datasheet
+label: Structure Type
+type: select
+options:
+ - Precast concrete manhole (personnel-entry)
+ - Precast concrete handhole/vault (hand-access)
+ - Polymer-concrete composite handhole
+ - Fiberglass (FRP) handhole
+default: Polymer-concrete composite handhole
+```
+
+```datasheet
+label: Precast Manhole Inside Diameter
+type: select
+unit: in
+options:
+ - "48"
+ - "60"
+ - "72"
+ - "96"
+default: "60"
+```
+
+```datasheet
+label: Handhole/Vault Plan Size (W x L)
+type: select
+unit: ft
+options:
+ - 2 x 2
+ - 2 x 3
+ - 3 x 3
+ - 3 x 5
+ - 4 x 4
+ - 4 x 6
+default: 3 x 5
+drawing_ref: true
+```
+
+```datasheet
+label: Handhole/Vault Depth
+type: range
+unit: in
+min: 12
+max: 48
+step: 6
+default: 24
+drawing_ref: true
+```
+
+## Load and Tier Rating {toc}
+
+### The single most common and costly error in handhole specification is a tier rating inconsistent with the final paving plan. {note}
+
+### Handholes set in areas called "non-traffic" during early design routinely end up in driveways or parking lots after a site redesign. Because the tier rating is established by proof-load testing, an under-rated cover in a traffic area is a failure waiting to happen and a field replacement at minimum. Where the traffic routing over a structure is uncertain at design time, specify one tier higher than the apparent minimum. {note}
+
+### Each structure and its cover shall be rated for the surface loading at its final installed location.
+
+### Where the traffic routing over a structure is uncertain at design time, the structure shall be specified one tier above the apparent minimum.
+
+### Polymer-concrete and composite enclosures and covers shall carry an ANSI/SCTE 77 tier rating not less than that scheduled for the structure.
+
+### Precast concrete structures in vehicular areas shall be designed for AASHTO H-20 or HS-20 wheel loading per ASTM C857.
+
+### The ANSI/SCTE 77 tier and the AASHTO loading class shall both be shown on the structure schedule so the rating intent is unambiguous regardless of the structure material furnished.
+
+```datasheet
+label: ANSI/SCTE 77 Tier Rating (Composite/Polymer Handholes)
+type: select
+options:
+ - Pedestrian/non-traffic (no tier)
+ - Tier 8 (~18,000 lb proof load)
+ - Tier 15 (~33,750 lb light vehicular)
+ - Tier 22 (~49,500 lb heavy vehicular / H-20)
+default: Tier 15 (~33,750 lb light vehicular)
+```
+
+```datasheet
+label: AASHTO Loading Class (Precast Concrete Structures)
+type: select
+options:
+ - Non-traffic / pedestrian
+ - H-10
+ - H-20
+ - HS-20
+default: H-20
+```
+
+# Concrete Construction {toc}
+
+## Precast concrete is the default for personnel-entry manholes and heavy-traffic vaults because its mass, reinforcement, and proven structural standards give it the durability and load capacity those duties demand. {note}
+
+## Cylindrical manhole sections are governed by ASTM C478/C478M (AASHTO M199 is the equivalent commonly cited on DOT and public-works work), while rectangular and non-circular vaults are governed by ASTM C858, with design loads taken from ASTM C857. Cast-in-place construction is reserved for non-standard geometries or congested duct entries that no stock precast unit accommodates, because field-formed concrete is slower and harder to quality-control than plant-cast units. {note}
+
+## Precast circular manhole sections, risers, and bases shall conform to ASTM C478/C478M or AASHTO M199.
+
+## Precast rectangular and non-circular utility structures shall conform to ASTM C858.
+
+## Concrete structural design loading shall be determined in accordance with ASTM C857.
+
+## Concrete shall attain a minimum 28-day compressive strength of 4,000 psi unless a higher strength is required by the structural design.
+
+## Cast-in-place structures shall be used only where standard precast units cannot accommodate the required geometry or duct-entry arrangement, and shall meet the same load rating as the equivalent precast structure.
+
+## Joints between precast sections shall be sealed with a preformed butyl or mastic sealant to limit groundwater infiltration.
+
+```datasheet
+label: Concrete Compressive Strength (28-day)
+type: range
+unit: psi
+min: 3000
+max: 6000
+step: 500
+default: 4000
+```
+
+```datasheet
+label: Manhole Construction Method
+type: select
+options:
+ - Precast (plant-cast sections)
+ - Cast-in-place
+default: Precast (plant-cast sections)
+```
+
+```datasheet
+label: Base / Floor Type
+type: select
+options:
+ - Standard precast base section
+ - Flat slab base
+ - Open / no base (drainage to soil)
+default: Standard precast base section
+```
+
+# Sizing {toc}
+
+## A box sized by catalog convenience rather than by the cables it must serve generates RFIs at cable installation, when the installer discovers the bend radius or fill cannot be achieved. {note}
+
+## NEC Article 314 establishes minimum dimensions for pull and junction boxes and handhole enclosures based on the largest raceway entering and the conductor bend radius, not on round-number catalog sizes. The plan dimensions and depth must be verified against the actual cable schedule for the largest conductors that will be pulled, with a service factor for future pulls, before a structure size is committed. {note}
+
+## Plan dimensions and depth shall satisfy the minimum sizing required by NEC Article 314 for the largest raceway and conductor entering the structure.
+
+## Structure dimensions shall be verified against the project cable schedule for conductor bend radius and fill before a size is committed.
+
+## Each structure shall include a service factor of spare interior space for future cable pulls.
+
+## The number, size, and location of duct entries (knockouts or cast-in terminators) shall be coordinated with the ductbank design per [[sync/underground-ductbank]] and shown on the shop drawings.
+
+```datasheet
+label: Spare Capacity / Service Factor for Future Pulls
+type: range
+unit: '%'
+min: 0
+max: 50
+step: 10
+default: 25
+```
+
+# Cover and Frame Assemblies {toc}
+
+## The cover and frame are the only part of the structure the public ever sees or touches, so material, load match, marking, and security all converge here. {note}
+
+## Frames and covers are cast from gray iron (ASTM A48, Class 35B minimum) for general duty, ductile iron (ASTM A536, Grade 65-45-12) for heavy-traffic duty, or molded from polymer-concrete or composite for handholes. The casting must match the structure's load/tier rating, carry the correct discipline legend, and be secured against unauthorized or accidental opening in any area accessible to the public. {note}
+
+## Cover and Frame Material {toc}
+
+### Gray iron frames and covers shall conform to ASTM A48, Class 35B minimum.
+
+### Ductile iron frames and covers shall conform to ASTM A536, Grade 65-45-12, and shall be used for heavy-traffic and HS-20 applications.
+
+### Composite and polymer-concrete covers shall carry the same ANSI/SCTE 77 tier rating as the structure they serve.
+
+### Metallic handhole enclosures used in submersible or continuously wet locations shall be rated NEMA 250 Type 6P.
+
+```datasheet
+label: Cover/Frame Material
+type: select
+options:
+ - Gray iron (ASTM A48 Class 35B)
+ - Ductile iron (ASTM A536 65-45-12)
+ - Polymer-concrete composite
+ - Fiberglass (FRP)
+default: Ductile iron (ASTM A536 65-45-12)
+```
+
+```datasheet
+label: Cylindrical Manhole Clear Opening
+type: select
+unit: in
+options:
+ - "24"
+ - "30"
+ - "36"
+default: "30"
+```
+
+```datasheet
+label: Cover Profile
+type: select
+options:
+ - Non-recessed (flush, solid)
+ - Recessed (paving infill)
+default: Non-recessed (flush, solid)
+```
+
+## Cover Markings {toc}
+
+### NEC 314.30 requires that a handhole cover be marked to identify it, but it does not specify the legend text -- the owner standard must define it, or the contractor will install blank or wrong-discipline covers. {note}
+
+### A cover that reads ELECTRIC over a telecommunications structure, or carries no legend at all, invites a wrong-discipline excavation and is a safety and maintenance liability. The discipline legend, and any owner asset-numbering provision, must be specified explicitly rather than left to the installer. {note}
+
+### Each cover shall be cast with a legend identifying the system it serves.
+
+### Where the owner requires asset identification, each structure shall be furnished with a cast-in or attached identification marker bearing the structure designation.
+
+```datasheet
+label: Cover Legend
+type: select
+options:
+ - ELECTRIC
+ - HIGH VOLTAGE
+ - TELEPHONE
+ - FIBER
+ - COMMUNICATIONS
+ - SIGNAL
+default: ELECTRIC
+```
+
+## Cover Security and Locking {toc}
+
+### NEC 314.30 permits a handhole cover to be secured either by requiring a tool to open it or by weighing more than 100 lb, but in a public area a lightweight unlocked cover is a security and safety liability and the locking requirement must be made explicit. {note}
+
+### Where a structure is in a publicly accessible area, the design intent for cover security cannot be left to the 100 lb default. A pentagonal-bolt, hex-bolt, or proprietary locking cover should be required so that the cover cannot be casually removed, exposing energized equipment or an open hole. {note}
+
+### Covers in publicly accessible areas shall be secured by a locking mechanism and shall not rely on weight alone.
+
+### Covers over medium-voltage manholes shall be locked or otherwise secured against unauthorized entry per NEC 110.34.
+
+### Locking hardware shall be corrosion-resistant and shall be operable with standard maintenance tools.
+
+```datasheet
+label: Cover Security Method
+type: select
+options:
+ - Weight only (>100 lb, non-traffic)
+ - Pentagonal-bolt locking
+ - Hex-bolt locking
+ - Proprietary locking
+default: Pentagonal-bolt locking
+```
+
+# Drainage and Sump {toc}
+
+## A structure built without a deliberate water-management decision will either fill with water (if sealed in a high water table) or flood from surface inflow (if unsealed in a low-lying area); the specification must state which approach applies. {note}
+
+## There is no universally correct drainage scheme. Where the water table is below the structure floor and a daylight or storm connection is available, a gravity drain is simplest. Where no gravity outlet exists, a perforated sump pit in the floor lets water percolate into the soil. Where the structure must remain dry or the authority prohibits discharge, a sealed watertight structure is required and water is removed by maintenance pumping. The choice depends on the water table and the local authority, and it must be coordinated with [[sync/site-utilities]]. {note}
+
+## The drainage approach for each structure shall be specified as gravity drain, perforated sump, or sealed watertight.
+
+## Structures with a gravity drain shall drain to daylight or to a storm system approved by the authority having jurisdiction.
+
+## Structures relying on a perforated sump shall include a sump pit recessed in the floor to collect and percolate water.
+
+## Sealed watertight structures shall use gasketed or mastic-sealed joints and sealed duct entries to exclude groundwater.
+
+## Ductbank invert elevations shall be coordinated so that conduits drain toward the structure and do not trap water, per [[sync/underground-ductbank]]. {note}
+
+## Many owners require ductbanks to slope toward manholes at a minimum of 1/8 in. per ft so that water drains out of the conduit and into the structure. If the manhole invert is set level with the incoming conduit, gravity drainage fails and water is trapped in the duct, which can freeze and damage cable. The structure invert must be set below the incoming conduit inverts so the slope is real. {note}
+
+## The structure invert shall be set below the invert of every incoming conduit so that ductbank drainage toward the structure is achieved.
+
+```datasheet
+label: Drainage Approach
+type: select
+options:
+ - Gravity drain to daylight/storm
+ - Perforated sump pit (percolation)
+ - Sealed watertight (pump-out)
+default: Perforated sump pit (percolation)
+```
+
+```datasheet
+label: Sump Pit Provided
+type: select
+options:
+ - "Yes"
+ - "No"
+default: "Yes"
+```
+
+# Grounding and Bonding {toc}
+
+## "Per NEC" is not a grounding specification; NEC Article 250 mandates bonding but does not dictate electrode placement or ground-ring continuity, and omitting the method produces inconsistent installations and coordination RFIs. {note}
+
+## NEC 250.92 and 250.96 require that metallic covers, frames, pulling irons, cable racks, and other metallic components within a manhole or handhole be bonded to the grounding system. What the code does not decide is how: a driven ground rod at each structure, a continuous bare-copper ground conductor carried through the ductbank and bonded at each structure, or both. The owner must choose one scheme so the installation is consistent and so the method is coordinated with the grounding requirements in [[sync/conductors-and-cables]]. For manholes associated with medium-voltage distribution, step-and-touch potential should be evaluated per IEEE 80. {note}
+
+## All metallic covers, frames, pulling irons, cable racks, and metallic components within each structure shall be bonded together and to the grounding system per NEC 250.92 and 250.96.
+
+## The grounding scheme for each structure shall be specified as a driven ground rod at the structure, a continuous bonded ground conductor in the ductbank, or both.
+
+## Bonding jumpers and grounding conductors shall be copper, sized per NEC Article 250.
+
+## For manholes associated with medium-voltage distribution, step-and-touch potential shall be evaluated in accordance with IEEE 80.
+
+## Bonding connections shall be made with listed irreversible (exothermic or compression) connectors suitable for direct burial and wet locations.
+
+```datasheet
+label: Grounding Scheme
+type: select
+options:
+ - Driven ground rod at each structure
+ - Continuous bonded ground conductor in ductbank
+ - Both (rod plus continuous conductor)
+default: Continuous bonded ground conductor in ductbank
+```
+
+```datasheet
+label: Ground Rod Length (where used)
+type: select
+unit: ft
+options:
+ - "8"
+ - "10"
+default: "10"
+```
+
+# Cable Support Hardware {toc}
+
+## The cable racks, pulling irons, and cast-in inserts are what make a structure usable for pulling and for the orderly long-term support of cable, and they must be specified and located on the shop drawings rather than improvised in the field. {note}
+
+## If pulling iron capacity and insert locations are left out of the shop drawing requirements, installers discover inadequate pulling points during the cable pull and resort to field core-drilling of the precast walls, which weakens the structure and delays the work. Cable racks carry the cables off the floor and away from standing water; their material is selected for the corrosion environment, and their inserts must be cast into the walls at the correct spacing before the structure leaves the plant. {note}
+
+## Cable Racks {toc}
+
+### Cable racks, arms, and standoff inserts shall be furnished and their locations cast into the structure walls at the spacing shown on the shop drawings.
+
+### Cable rack material shall be selected for the corrosion environment from epoxy-coated steel, aluminum, or fiberglass.
+
+### Cable racks shall support cables off the structure floor and clear of any sump or standing water.
+
+```datasheet
+label: Cable Rack Material
+type: select
+options:
+ - Epoxy-coated steel
+ - Aluminum
+ - Fiberglass
+default: Fiberglass
+```
+
+```datasheet
+label: Cable Rack Spacing (on center)
+type: range
+unit: in
+min: 12
+max: 48
+step: 6
+default: 36
+```
+
+## Pulling Irons and Inserts {toc}
+
+### Pulling irons or pulling eyes shall be cast into the structure opposite each duct entry to provide a pulling point in line with the duct.
+
+### Each pulling iron shall be rated for the maximum pulling tension of the largest cable to be installed, with the rated capacity shown on the shop drawings.
+
+### The location and rated capacity of every pulling iron, pulling eye, and cast-in insert shall be shown on the shop drawings and shall be cast in at the plant, not field-drilled.
+
+```datasheet
+label: Pulling Iron Rated Capacity
+type: range
+unit: lb
+min: 5000
+max: 30000
+step: 5000
+default: 15000
+```
+
+# Grade Adjustment {toc}
+
+## Final cover elevation must match finished grade, and if the design does not specify adjustable grade rings the contractor field-improvises and the cover ends up proud of or below the pavement. {note}
+
+## The top of the structure is set during installation but the finished grade is established later by paving or landscaping. Concrete adjustment rings or HDPE/cast-iron grade rings let the installer bring the frame and cover to the exact final elevation. The allowable range of adjustment and the ring material must be specified so the contractor does not improvise with shims or excess mortar. {note}
+
+## The structure shall be furnished with adjustable grade rings or adjustment rings to set the cover flush with finished grade.
+
+## The final cover elevation shall match the finished grade at the structure within the tolerance specified by the authority having jurisdiction.
+
+## Grade-ring material shall be specified as concrete adjustment rings, HDPE rings, or cast-iron rings.
+
+```datasheet
+label: Grade Ring Material
+type: select
+options:
+ - Concrete adjustment rings
+ - HDPE rings
+ - Cast-iron rings
+default: Concrete adjustment rings
+```
+
+```datasheet
+label: Grade Adjustment Range Provided
+type: range
+unit: in
+min: 2
+max: 12
+step: 1
+default: 6
+```
+
+# Mixed-Discipline Structures {toc}
+
+## Placing power and telecommunications cable in the same structure without segregation violates utility owner rules and the spirit of NEC 300.3, and it must be resolved at design, not in the field. {note}
+
+## Where a single structure must carry both power and communications cable, the two systems must be physically segregated -- typically on cable racks on opposite walls with a minimum clearance between them -- so that induced voltage, heat, and maintenance access do not create a conflict. Many utility owners flatly prohibit shared structures; where they are permitted, the segregation arrangement must be shown on the shop drawings. {note}
+
+## Power and communications cable shall not share a structure unless the design explicitly provides for it and the serving utility permits it.
+
+## Where a shared structure is permitted, power and communications cable shall be segregated on opposite walls with the minimum clearance required by the serving utility and NEC 300.3.
+
+## The segregation arrangement for any shared structure shall be shown on the shop drawings.
+
+```datasheet
+label: Structure Discipline
+type: select
+options:
+ - Power only
+ - Communications only
+ - Shared (segregated power + communications)
+default: Power only
+```
+
+# Installation {toc}
+
+## A structure is only as good as its bedding, its duct connections, and its final grade, and these execution items are where field practice most often departs from the design intent. {note}
+
+## The excavation must be over-dug and a compacted granular base provided so the structure bears uniformly and does not settle. Duct entries must be made up watertight so the structure does not become the low point that collects every conduit's groundwater. The cover must be brought to the exact finished grade. Each of these is an obligation the installer must meet, and each is a common source of callbacks when skipped. {note}
+
+## The structure shall be set on a compacted granular base of the depth required by the structural design and the bearing soil.
+
+## Backfill shall be placed and compacted in lifts around the structure to the density required by the project geotechnical requirements.
+
+## Duct entries shall be sealed watertight at the structure wall after cables are installed.
+
+## The structure shall be set plumb and to the invert elevations shown on the drawings.
+
+## The cover and frame shall be set flush with finished grade using the specified adjustment rings.
+
+## Personnel-entry manholes shall not be entered for installation work until confined-space entry procedures per OSHA 29 CFR 1910.146 are in place.
+
+# Testing {toc}
+
+## Each structure shall be visually inspected after setting for cracks, spalls, and joint or duct-entry leakage.
+
+## The continuity of all bonding connections shall be verified, and the grounding electrode resistance shall be measured and recorded where a ground rod is installed.
+
+## Sealed watertight structures shall be tested for water-tightness by visual inspection for infiltration after a high-groundwater or wet-weather period, or by a vacuum/exfiltration test where required by the authority having jurisdiction.
+
+## Composite and polymer-concrete enclosure proof-load certification shall be confirmed against the delivered product's markings.
+
+```datasheet
+label: Field Tests
+type: checkbox
+options:
+ - Visual inspection (cracks, spalls, leakage)
+ - Bonding continuity verification
+ - Ground electrode resistance measurement
+ - Watertightness inspection/test (sealed structures)
+default:
+ - Visual inspection (cracks, spalls, leakage)
+ - Bonding continuity verification
+ - Ground electrode resistance measurement
+```
+
+# Delivery, Storage, and Handling {toc}
+
+## Precast structures shall be lifted only at the cast-in lifting points using the manufacturer's rigging instructions.
+
+## Structures shall be stored on level, well-drained ground and protected from impact and from the intrusion of debris into duct openings.
+
+## Covers and frames shall be stored to prevent damage to machined seating surfaces and locking hardware.
+
+## Composite and polymer-concrete enclosures shall be protected from point loading and from prolonged direct sunlight during storage where the manufacturer so requires.
+
+# Warranty {toc}
+
+## The manufacturer shall warrant each structure, cover, and frame against defects in materials and workmanship for the period specified below from the date of substantial completion.
+
+## The warranty shall cover failure to meet the certified load or tier rating under the rated service conditions.
+
+```datasheet
+label: Warranty Period
+type: select
+unit: years
+options:
+ - "1"
+ - "2"
+ - "5"
+default: "1"
+```
+
+# Spare Parts {toc}
+
+## The Contractor shall furnish spare covers and frames for each structure type and size installed, in the quantity specified below.
+
+## The Contractor shall furnish spare locking hardware sets matching the installed locking covers.
+
+```datasheet
+label: Spare Covers/Frames per Type and Size
+type: range
+unit: each
+min: 0
+max: 5
+step: 1
+default: 1
+```
+
+```datasheet
+label: Spare Locking Hardware Sets
+type: range
+unit: each
+min: 0
+max: 10
+step: 1
+default: 2
+```
+
+## --- {note}
+
+## *This SynC standard was independently authored from public consensus standards, building codes, and professional engineering knowledge. It is licensed CC BY-SA. It contains no proprietary guide-specification prose and uses no CSI MasterFormat numbering.* {note}