+---
+title: Loading Dock Equipment
+category: Architectural / Specialties
+toc_depth: 3
+description: >
+ When to use: Specifying, selecting, and installing the full assembly of equipment at truck-height loading docks — dock levelers (mechanical, hydraulic, air-powered, vertical-storing, edge-of-dock), portable dock plates and boards, dock bumpers, dock seals and shelters, vehicle/trailer restraints, and the electrical interlock and dock-light system that ties them together. Applies to distribution centers, warehouses, cold-storage facilities, retail and institutional receiving docks, food and beverage plants, and industrial facilities, for both new dock-pit construction and retrofit at existing openings.
+ Not intended for: The doors that close the dock opening (see [[sync/overhead-coiling-doors]] and [[sync/sectional-overhead-doors]]); the structural concrete/masonry dock pit and pit-wall (general structural package); shop-fabricated dock approach aprons and recessed bumper angle iron furnished by structural steel trades (see [[sync/metal-fabrications]]); wall and corner protection at staging areas (see [[sync/wall-and-corner-protection]]); interior cranes and hoists (see [[sync/overhead-material-handling]]); refrigeration and cold-chain systems (see [[sync/refrigeration-equipment]]); and dock approach paving, yard grading, and trailer-yard design (civil/site scope).
+---
+
+# Scope {toc}
+
+## This Section covers the equipment installed at a truck-height loading dock to bridge the gap between the dock floor and the trailer bed, seal the opening against weather, cushion the trailer approach, and secure the trailer against departure while a powered industrial truck is aboard. {note}
+
+## The loading dock is a single coordinated system, not a collection of independent purchases. {note}
+
+## The dock leveler, dock seal or shelter, dock bumpers, vehicle restraint, dock light, and interlock controls are dimensionally and electrically interdependent: bumper projection sets seal compression and trailer stand-off, the leveler model dictates pit dimensions, and the restraint status must be wired to the leveler power enable and the traffic light. Specifying or bidding these as unrelated line items is the root cause of most dock-coordination RFIs, so this Section treats them as one assembly. {note}
+
+## The equipment covered by this Section shall be furnished and installed under a single responsible Contractor. {note}
+
+## Work of this Section includes pit-type dock levelers, edge-of-dock levelers, portable dock plates and boards, dock bumpers, dock seals and shelters, vehicle restraints, dock lights, and the electrical interlock control system. {note}
+
+## The following are excluded from this Section. {note}
+- Overhead coiling and sectional doors closing the dock opening — see [[sync/overhead-coiling-doors]] and [[sync/sectional-overhead-doors]].
+- Structural concrete or masonry dock pit, pit walls, embedded angles, and anchor bolts — part of the general structural/concrete package; this Section coordinates rough-in dimensions but does not re-specify the concrete.
+- Shop-fabricated steel dock approach aprons and recessed bumper angle iron welded in place by structural steel trades — see [[sync/metal-fabrications]].
+- Wall and corner protection at dock staging and circulation areas — see [[sync/wall-and-corner-protection]].
+- Interior overhead cranes and hoists used for lifting within the building — see [[sync/overhead-material-handling]].
+- Refrigeration equipment and cold-chain systems serving cold-storage facilities — see [[sync/refrigeration-equipment]].
+- Dock approach paving, site grading, and trailer-yard design — civil/site scope outside this Section.
+
+## Cold-storage and refrigerated docks are a distinct sub-condition within this Section. {note}
+
+## Refrigerated docks require vertical-storing levelers, inflatable or rigid-frame shelters, low-temperature hydraulic fluid, and corrosion-resistant finishes to preserve the thermal envelope. Where the project includes refrigerated docks, the requirements flagged "cold storage" throughout this Section govern over the standard-warehouse defaults. {note}
+
+# 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.
+
+| Standard | Title |
+|----------|-------|
+| ANSI MH30.1-2022 | Performance and Testing Requirements for Dock Leveling Devices (Built-in) |
+| ANSI MH30.2-2022 | Performance and Testing Requirements for Portable Dock Leveling Devices |
+| OSHA 29 CFR 1910.178(k)(1) | Powered Industrial Trucks — Securing Trucks or Trailers to Loading Docks |
+| OSHA 29 CFR 1910.23 | Ladders and Guarding of Open-Sided Dock Openings |
+| NFPA 101 | Life Safety Code (egress at dock areas) |
+| IBC Chapter 11 | Accessibility for Service and Utility Areas |
+| ICC A117.1 | Accessible and Usable Buildings and Facilities |
+| UL 325 | Door, Drapery, Gate, Louver, and Window Operators and Systems |
+
+# Submittals {toc}
+
+## Action Submittals {note}
+
+## Action submittals establish that the proposed equipment matches the specified performance, dimensions, and coordination requirements before fabrication. The dock pit cannot be poured correctly until the leveler shop drawings fix the pit dimensions, so these submittals are on the critical path. {note}
+
+### The Contractor shall submit the following action submittals for review before fabrication or pit construction:
+- Product data for each dock leveler, edge-of-dock leveler, dock seal or shelter, dock bumper, vehicle restraint, dock light, and control panel, including rated capacity, platform dimensions, working range, and finish.
+- Shop drawings showing pit dimensions (width, length, depth), required clearances, embedded-angle and anchor layout, and the relationship of leveler, bumpers, seal/shelter, and restraint at each dock opening.
+- Wiring diagrams for the interlock control system showing the restraint-to-leveler power enable, the interior and exterior traffic lights, and the dock-light circuit.
+- A dock-opening schedule keyed to the drawings identifying each opening by number with its leveler model, capacity, seal/shelter type, restraint type, and finish.
+
+```datasheet
+label: Action submittals required
+type: checkbox
+options:
+ - Product data (leveler, EOD, seal/shelter, bumper, restraint, light, controls)
+ - Shop drawings (pit dimensions, clearances, embeds, anchor layout)
+ - Interlock wiring diagrams
+ - Dock-opening schedule keyed to drawings
+default:
+ - Product data (leveler, EOD, seal/shelter, bumper, restraint, light, controls)
+ - Shop drawings (pit dimensions, clearances, embeds, anchor layout)
+ - Interlock wiring diagrams
+ - Dock-opening schedule keyed to drawings
+```
+
+## Informational Submittals {note}
+
+## Informational submittals document that the equipment was tested and rated as required and give the project a basis for verifying compliance in the field. {note}
+
+### The Contractor shall submit the following informational submittals:
+- Factory load-cycle test certification per ANSI MH30.1 confirming each built-in leveler was tested at its rated capacity before shipment.
+- Rated-capacity marking documentation showing the load rating permanently affixed to each leveler.
+- Manufacturer's certification that the vehicle restraint and leveler controls are compatible and interlock as a system.
+
+```datasheet
+label: Informational submittals required
+type: checkbox
+options:
+ - Factory load-cycle test certification (ANSI MH30.1)
+ - Rated-capacity marking documentation
+ - Restraint/leveler interlock compatibility certification
+default:
+ - Factory load-cycle test certification (ANSI MH30.1)
+ - Rated-capacity marking documentation
+ - Restraint/leveler interlock compatibility certification
+```
+
+## Closeout Submittals {note}
+
+## Closeout submittals give the Owner what is needed to operate, maintain, and warranty the equipment over its service life. {note}
+
+### The Contractor shall submit the following closeout submittals:
+- Operation and maintenance manuals for each item of dock equipment, including lubrication, adjustment, and troubleshooting procedures.
+- Written warranties for the leveler structure, hydraulic and pneumatic components, seals and shelters, and restraints.
+- Field acceptance test reports documenting full-travel operation and verified interlock function at each dock opening.
+
+```datasheet
+label: Closeout submittals required
+type: checkbox
+options:
+ - Operation and maintenance manuals
+ - Written warranties (structure, hydraulics/pneumatics, seals, restraints)
+ - Field acceptance test reports
+default:
+ - Operation and maintenance manuals
+ - Written warranties (structure, hydraulics/pneumatics, seals, restraints)
+ - Field acceptance test reports
+```
+
+# Quality Assurance {toc}
+
+## Manufacturer Qualifications {note}
+
+## Loading dock equipment is a safety system that secures multi-ton vehicles and supports loaded forklifts. A manufacturer with an established production record and published load ratings is essential; field-fabricated or unrated equipment has no place at an active dock. {note}
+
+### Dock levelers shall be the product of a single manufacturer regularly engaged in the production of dock leveling equipment and tested to ANSI MH30.1 or ANSI MH30.2 as applicable.
+
+### The dock leveler, vehicle restraint, and interlock controls should be furnished by a single manufacturer or by manufacturers who certify mutual interlock compatibility, to avoid control-integration gaps.
+
+## Installer Qualifications {note}
+
+## Pit-fit, lip-engagement, and interlock wiring all depend on installer skill; a poorly set leveler will bind in the pit or fail to reach the trailer floor. {note}
+
+### The installer shall be the equipment manufacturer's authorized representative or a contractor trained and approved by the manufacturer for this equipment.
+
+## Regulatory Requirements {note}
+
+## The vehicle-restraint requirement is a regulatory driver, not a design preference: OSHA 29 CFR 1910.178(k)(1) requires positive securement of any trailer while a powered industrial truck is aboard, which makes a restraint (or, at minimum, wheel chocks) mandatory on virtually every active commercial dock. {note}
+
+### Each active dock position served by powered industrial trucks shall be provided with a positive trailer-securement means — a vehicle restraint or, where a restraint is not provided, wheel chocks — in accordance with OSHA 29 CFR 1910.178(k)(1).
+
+### Open dock openings that present a fall hazard when no trailer is present shall be guarded in accordance with OSHA 29 CFR 1910.23.
+
+### Dock equipment shall not obstruct any required means of egress under NFPA 101.
+
+### Where employees must access leveler or restraint controls along an accessible route, the route and control reach ranges shall comply with IBC Chapter 11 and ICC A117.1.
+
+# Environmental and Service Conditions {toc}
+
+## Service Environment {note}
+
+## The service environment governs the leveler activation type and the finish more than any other single factor. A mechanical spring leveler that is reliable in a heated dry warehouse will corrode and lose preload in a freezer or a wash-down area, and a standard painted finish that is fine indoors will rust at a refrigerated or food-processing dock. {note}
+
+### The Contractor shall select equipment activation type and finish appropriate to the service environment of each dock as scheduled below.
+
+```datasheet
+label: Service environment
+type: radio
+options:
+ - Heated/conditioned warehouse (ambient)
+ - Unheated/ambient-exposed dock
+ - Wash-down / food and beverage processing
+ - Refrigerated / cold storage (above freezing)
+ - Freezer (below freezing)
+default: Heated/conditioned warehouse (ambient)
+```
+
+## Mechanical levelers shall not be specified in cold-storage, freezer, or wash-down environments; hydraulic or air-powered levelers shall be used where the service environment is wash-down, refrigerated, or freezer. {note}
+
+## Trailer Fleet {note}
+
+## Seal and shelter selection depends on the height and width spread of the trailers the dock will actually serve. A seal sized for a single trailer height gaps badly against a shorter trailer, so the specifier must capture the fleet's height variation rather than a single nominal dimension. {note}
+
+### The Contractor shall confirm the trailer fleet's bed-height and overall-height range with the Owner and select seals or shelters that maintain contact across that range.
+
+```datasheet
+label: Trailer fleet height variation accommodated
+type: select
+unit: in
+options:
+ - "±6"
+ - "±9"
+ - "±12"
+default: "±12"
+```
+
+# Dock Levelers {toc}
+
+## Leveler Type {note}
+
+## The leveler type is the first and most consequential decision. Mechanical (spring-assisted, walk-down) levelers are the lowest first cost and suit lower-throughput conditioned docks. Hydraulic (pushbutton) levelers are the medium-to-high-throughput standard and the most common choice for new distribution warehouses. Air-powered (pneumatic bladder) levelers add reliability in cold and wash-down service. Vertical-storing levelers (VSL) store against the door face to preserve the thermal envelope and are required at refrigerated docks. Edge-of-dock levelers mount to the dock face without a pit and serve only low-volume or retrofit openings. {note}
+
+### The Contractor shall furnish the leveler type scheduled for each dock opening.
+
+```datasheet
+label: Dock leveler type
+type: radio
+options:
+ - Mechanical pit-type (spring-assisted, walk-down)
+ - Hydraulic pit-type (pushbutton)
+ - Air-powered pit-type (pneumatic bladder)
+ - Vertical-storing leveler (cold storage)
+ - Edge-of-dock (surface-mounted, low-volume/retrofit)
+default: Hydraulic pit-type (pushbutton)
+```
+
+## A vertical-storing leveler with an insulated door and an inflatable or rigid-frame shelter shall be provided at refrigerated and freezer docks; a standard pit leveler shall not be used at a refrigerated dock. {note}
+
+## Edge-of-dock levelers shall not be specified where the dock will see high forklift traffic, heavy loads, or routine trailer-height variation exceeding the unit's working range. {note}
+
+## Edge-of-dock units have a working range of only about ±3 in. and a lower capacity than pit levelers; at an active dock, normal trailer-height variation will exceed that range routinely, so the apparent first-cost saving turns into an operational problem. {note}
+
+## Rated Capacity {note}
+
+## Capacity is sized from the actual heaviest forklift on the project, not a catalog maximum. The accepted selection basis is the gross vehicle weight of the heaviest loaded forklift multiplied by a service factor of at least 2.5. Sizing to a theoretical maximum over-specifies and over-spends; sizing below the real forklift weight is unsafe. {note}
+
+### The dock leveler rated working load shall be not less than 2.5 times the gross vehicle weight of the heaviest loaded powered industrial truck using the dock.
+
+### The rated working load shall be permanently marked on each leveler in accordance with ANSI MH30.1.
+
+```datasheet
+label: Dock leveler rated working load
+type: range
+unit: lb
+min: 25000
+max: 80000
+step: 5000
+default: 35000
+```
+
+## Platform Dimensions {note}
+
+## Platform width governs the usable width relative to the trailer, and platform length governs the approach angle into the trailer — a longer platform reduces the grade the forklift climbs. The 7 ft width accommodates the standard 96 in. trailer opening, and the 8 ft length is the new-construction default because it eases the approach. {note}
+
+### The leveler platform width shall be as scheduled to suit the trailer opening width served.
+
+```datasheet
+label: Dock leveler platform width
+type: select
+unit: ft
+options:
+ - "6"
+ - "7"
+default: "7"
+```
+
+### The leveler platform length shall be as scheduled to control the approach grade into the trailer.
+
+```datasheet
+label: Dock leveler platform length
+type: select
+unit: ft
+options:
+ - "6"
+ - "8"
+default: "8"
+```
+
+## Working Range {note}
+
+## The working range is how far above and below dock level the leveler can service a trailer bed. Standard pit levelers reach about ±10 in.; extended-range models reach ±12 in. for fleets with wide bed-height variation. Edge-of-dock units are limited to roughly ±3 in. {note}
+
+### The leveler working range shall be not less than the value scheduled for the dock opening, measured above and below dock level.
+
+```datasheet
+label: Dock leveler working range (above/below dock level)
+type: select
+unit: in
+options:
+ - "±3 (edge-of-dock)"
+ - "±10 (standard pit)"
+ - "±12 (extended-range pit)"
+default: "±10 (standard pit)"
+```
+
+## Lip {note}
+
+## The lip is the hinged extension that bridges from the platform onto the trailer floor. ANSI MH30.1 requires a minimum 4 in. of lip engagement onto the trailer bed; the standard 12 in. lip projection past the bumper face provides that engagement with margin. {note}
+
+### The lip shall project not less than 12 in. past the face of the dock bumpers.
+
+### The lip shall achieve not less than 4 in. of bearing engagement onto the trailer floor in accordance with ANSI MH30.1.
+
+## Activation Controls {note}
+
+## Pushbutton activation suits hydraulic and air-powered levelers; mechanical levelers use a walk-down hold-down chain. The control voltage of powered levelers and their interlock safety circuit must be coordinated with the electrical scope, typically at 120 VAC line power with a 24 VDC safety circuit. {note}
+
+### Powered levelers shall be operated from a pushbutton control station at the dock position, integrated with the interlock control panel.
+
+```datasheet
+label: Leveler control voltage
+type: radio
+options:
+ - 120 VAC line / 24 VDC safety circuit
+ - 120 VAC line / 120 VAC safety circuit
+default: 120 VAC line / 24 VDC safety circuit
+```
+
+## Pit Construction Coordination {note}
+
+## The single most expensive coordination failure at a dock is a pit poured to generic dimensions that do not match the selected leveler. Pit width, length, and depth are model-specific; the structural drawings must reflect the approved leveler shop drawings, or the concrete must be demolished and re-poured. This Section coordinates the rough-in but the concrete itself is in the structural package. {note}
+
+### The dock pit shall be constructed to the dimensions and clearances shown on the approved leveler shop drawings before the leveler is installed.
+
+### The Contractor shall verify pit width, length, and depth against the approved leveler submittal and report any discrepancy before concrete placement. [[drawing: dock pit dimension plan]]
+
+### Embedded angles and anchor points for the leveler frame shall be located as shown on the approved shop drawings. [[drawing: leveler embed and anchor layout]]
+
+# Portable Dock Plates and Boards {toc}
+
+## Portable Equipment {note}
+
+## Portable dock plates and boards serve temporary, low-frequency, or overflow openings where a fixed leveler is not justified. They are rated to ANSI MH30.2 and are sized from the same forklift-weight basis as fixed levelers, but at much lower capacities. {note}
+
+### Portable dock plates and boards shall be tested and rated in accordance with ANSI MH30.2 with the rated capacity permanently marked.
+
+### Portable equipment shall be provided with handling provisions and curb or side rails appropriate to its rated capacity.
+
+```datasheet
+label: Portable dock plate/board
+type: radio
+options:
+ - Aluminum dock plate
+ - Steel dock plate
+ - Aluminum dock board (curbed)
+ - Steel dock board (curbed)
+default: Aluminum dock board (curbed)
+```
+
+```datasheet
+label: Portable equipment rated capacity
+type: range
+unit: lb
+min: 5000
+max: 15000
+step: 1000
+default: 10000
+```
+
+# Dock Bumpers {toc}
+
+## Bumper Function {note}
+
+## Dock bumpers absorb the impact of a backing trailer and set the stand-off distance between the trailer and the dock face. That stand-off distance is what determines whether the dock seal compresses correctly and whether the leveler lip reaches the trailer floor. Because bumpers govern both seal compression and trailer position, they must never be left as a furnishing by others. {note}
+
+## Dock bumpers shall be furnished and installed under this Section at every dock opening; bumpers shall not be omitted or deferred to another trade. {note}
+
+## Bumper Type and Projection {note}
+
+## Molded rubber bumpers are the standard single-piece choice; laminated rubber bumpers are built from plies and are field-cuttable and low cost; steel-face bumpers add a steel plate over a rubber core for forklift-approach abuse. Projection (typically 4 to 6 in.) must be coordinated with the door rough opening and the seal projection so the seal foam can compress against the trailer. {note}
+
+### The Contractor shall furnish the bumper type scheduled for each dock opening.
+
+```datasheet
+label: Dock bumper type
+type: radio
+options:
+ - Molded rubber
+ - Laminated rubber
+ - Steel-face (rubber core, steel plate)
+default: Molded rubber
+```
+
+### Bumper projection past the dock face shall be as scheduled and coordinated with the seal/shelter projection and the door rough opening.
+
+```datasheet
+label: Dock bumper projection past dock face
+type: range
+unit: in
+min: 4
+max: 6
+step: 0.5
+default: 4.5
+```
+
+# Dock Seals and Shelters {toc}
+
+## Seal versus Shelter {note}
+
+## A dock seal uses compressible foam pads on the head and sides that the trailer presses into; it is low cost and seals well on trailers of consistent size. A shelter uses a frame with fabric curtains that drape over the trailer and accommodates much greater trailer-height and width variation, which is why high-volume docks with mixed fleets use shelters. Compression foam seals are the standard commercial choice, rigid-frame shelters suit high-volume mixed-fleet docks, flex-face shelters fall in between, and inflatable seals give the best thermal seal for cold storage. {note}
+
+### The Contractor shall furnish the seal or shelter type scheduled for each dock opening to suit the fleet and the thermal requirement.
+
+```datasheet
+label: Dock seal/shelter type
+type: radio
+options:
+ - Compression foam seal
+ - Flex-face shelter
+ - Rigid-frame shelter
+ - Inflatable/pneumatic seal (cold storage)
+default: Compression foam seal
+```
+
+## Inflatable/pneumatic seals shall be provided at refrigerated and freezer docks where the thermal seal is critical. {note}
+
+## Seal and Shelter Dimensions {note}
+
+## The seal or shelter head height and side-pad dimensions must be set from the trailer fleet so the assembly maintains contact across the fleet's height range. A standard over-the-road trailer is roughly 8 ft 6 in. to 13 ft 6 in. overall including the RIG-bar clearance, so the head height typically falls between 10 ft and 14 ft above the finished dock floor depending on the fleet mix. {note}
+
+### The seal or shelter head height and side-pad dimensions shall be selected to maintain contact across the trailer fleet's full height and width range.
+
+```datasheet
+label: Seal/shelter head height above finished dock floor
+type: range
+unit: ft
+min: 10
+max: 14
+step: 0.5
+default: 13
+```
+
+### Where the trailer fleet height varies, an adjustable-head seal or a flex-face or rigid-frame shelter shall be provided so the assembly does not gap on shorter trailers.
+
+# Vehicle Restraints {toc}
+
+## Restraint Function {note}
+
+## The vehicle restraint physically holds the trailer against the dock so it cannot pull away, creep, or "trailer-walk" off the dock while a forklift is aboard. This is the regulatory heart of the dock safety system under OSHA 29 CFR 1910.178(k)(1). Hook-style restraints engage the trailer's ICC/RIG bar; vertical-barrier restraints raise a barrier behind the trailer and work even on trailers without an ICC bar. {note}
+
+### A vehicle restraint shall be provided and interlocked with the leveler and dock light at each active dock position unless wheel chocks are accepted by the Owner for a specific low-volume opening.
+
+## Restraint Type {note}
+
+## Electric hook-style (RIG) restraints are motor-driven and self-engaging and are the high-volume standard; manual hook-style restraints are hand-operated and lower cost for lower-volume docks; vertical-barrier restraints handle non-standard trailers that lack a usable ICC bar. OSHA requires positive securement but does not specify a numeric holding-force value, so the holding force is selected from the manufacturer's published rating for the dock's duty. {note}
+
+### The Contractor shall furnish the restraint type scheduled for each dock opening.
+
+```datasheet
+label: Vehicle restraint type
+type: radio
+options:
+ - Electric hook-style (RIG)
+ - Manual hook-style
+ - Vertical-barrier
+ - Wheel chocks (low-volume only)
+default: Electric hook-style (RIG)
+```
+
+### The restraint holding (pull-away) force rating shall be not less than the value scheduled for the dock's duty.
+
+```datasheet
+label: Restraint holding (pull-away) force rating
+type: range
+unit: lb
+min: 20000
+max: 60000
+step: 5000
+default: 40000
+```
+
+# Interlock Controls and Dock Lights {toc}
+
+## Interlock System {note}
+
+## The interlock is the logic that makes the dock safe and is the most common source of integration RFIs when the restraint and leveler come from different manufacturers without confirmed compatibility. When the restraint is engaged, the interior light turns green and the leveler is enabled; when it is not, the interior light is red and the leveler is locked out. A matching exterior light tells the driver red (do not pull away) or green (clear to depart). {note}
+
+### The restraint, leveler, and dock lights shall be wired as a single interlock so that the leveler cannot be operated until the restraint is positively engaged.
+
+### An interior traffic light shall indicate restraint-engaged (green) or not-engaged (red) status to dock personnel.
+
+### An exterior traffic light shall indicate to the driver red (do not depart) when the restraint is engaged and green (clear to depart) when it is released.
+
+### Where the restraint and leveler are from different manufacturers, the Contractor shall submit certification that their control systems interlock as specified before procurement.
+
+## Dock Management for Multi-Position Docks {note}
+
+## On larger facilities the per-opening interlocks should be coordinated at a system level so each door, leveler, and restraint set is not bid and integrated independently. A facility with many dock positions benefits from a common control panel or dock management system that standardizes the interlock logic across all openings. {note}
+
+### Where the project has 10 or more dock positions, a system-level interlock control panel or dock management system should be specified to standardize interlock logic across all openings.
+
+```datasheet
+label: Interlock and dock-light scope
+type: checkbox
+options:
+ - Restraint-to-leveler power-enable interlock
+ - Interior red/green status light
+ - Exterior driver red/green light
+ - System-level control panel / dock management system
+default:
+ - Restraint-to-leveler power-enable interlock
+ - Interior red/green status light
+ - Exterior driver red/green light
+```
+
+# Finishes and Corrosion Protection {toc}
+
+## Finish Selection {note}
+
+## The finish follows the service environment. Standard painted finish is acceptable indoors in a conditioned warehouse; hot-dip galvanizing is appropriate for exposed or damp service; and stainless or galvanized components with low-temperature hydraulic fluid are required at food-processing, wash-down, and cold-storage docks where corrosion and sanitation are concerns. {note}
+
+### The Contractor shall provide the finish scheduled for each dock opening consistent with its service environment.
+
+```datasheet
+label: Equipment finish / corrosion protection
+type: radio
+options:
+ - Standard paint (conditioned interior)
+ - Hot-dip galvanized
+ - Stainless / galvanized for food and cold storage
+default: Standard paint (conditioned interior)
+```
+
+### Powered levelers serving refrigerated, freezer, or wash-down docks shall be provided with low-temperature hydraulic fluid suitable for the service temperature.
+
+# Testing {toc}
+
+## Factory Testing {note}
+
+## Factory load-cycle testing is the assurance that the leveler will carry its rated load in service, and ANSI MH30.1 requires it before shipment for built-in levelers. The test certification belongs in the informational submittals so the project can verify it. {note}
+
+### Each built-in dock leveler shall be load-cycle tested at its rated capacity before shipment in accordance with ANSI MH30.1.
+
+### The factory test certification shall be provided for each leveler as an informational submittal.
+
+## Field Acceptance Testing {note}
+
+## Field acceptance confirms that the installed assembly actually works as a system: the leveler travels through its full range above and below dock level under load, the restraint engages, and the interlock prevents leveler operation until the restraint is set. A loaded forklift or an equivalent simulated load is used to exercise the leveler. {note}
+
+### Each leveler shall be field-tested through its full travel above and below dock level under a loaded forklift or an equivalent simulated load.
+
+### Each restraint shall be field-tested to confirm positive engagement of the trailer.
+
+### The interlock shall be field-tested to confirm the leveler cannot be operated until the restraint is engaged and the traffic lights indicate correctly.
+
+### Field acceptance test results shall be recorded for each dock opening and submitted as a closeout submittal.
+
+# Installation {toc}
+
+## Coordination {note}
+
+## Installation is where the system either comes together or generates RFIs. The leveler pit must already match the approved shop drawings, the bumpers must be set before the seal so seal compression is correct, and the approach apron grade must be within the civil tolerance or the trailer will not seat against the bumpers and the lip will not reach the trailer floor. {note}
+
+### Equipment shall be installed in accordance with the manufacturer's published instructions and the approved shop drawings.
+
+### Dock bumpers shall be installed before the dock seal or shelter so that seal compression against the trailer is established correctly.
+
+### The Contractor shall verify that the dock approach apron grade does not exceed 10% before accepting the dock for leveler installation, and shall report any steeper grade. [[drawing: dock approach apron grade]]
+
+### Powered leveler and restraint controls shall be connected to the building electrical supply and the interlock circuit by the electrical trade under coordinated scope. [[drawing: dock equipment power and control routing]]
+
+## Open dock openings shall be guarded against falls in accordance with OSHA 29 CFR 1910.23 during and after installation wherever a trailer is not present. {note}
+
+# Delivery, Storage, and Handling {toc}
+
+## Protection {note}
+
+## Levelers, restraints, and control panels are damaged by water intrusion and rough handling before installation, and the manufacturer's warranty depends on proper handling. {note}
+
+### Equipment shall be delivered in the manufacturer's packaging and stored under cover, protected from weather and physical damage until installation.
+
+### Hydraulic and pneumatic components and electrical control panels shall be protected from moisture and contamination during storage.
+
+# Warranty {toc}
+
+## Warranty Coverage {note}
+
+## Dock equipment is a long-service safety system, and the warranty terms differ by component: the leveler structure carries the longest term, while hydraulic, pneumatic, seal, and restraint components carry shorter wear-component terms. The specifier should set the required terms to match the Owner's expectation rather than accept the manufacturer's minimum. {note}
+
+### The Contractor shall provide the manufacturer's written warranty for each item of dock equipment for not less than the periods scheduled.
+
+```datasheet
+label: Leveler structural warranty period
+type: select
+unit: yr
+options:
+ - "5"
+ - "10"
+ - "Lifetime"
+default: "10"
+```
+
+```datasheet
+label: Hydraulic / pneumatic / seal / restraint component warranty period
+type: select
+unit: yr
+options:
+ - "1"
+ - "2"
+ - "5"
+default: "2"
+```
+
+# Spare Parts {toc}
+
+## Spare Parts and Maintenance Stock {note}
+
+## Keeping wear parts on hand keeps an active dock in service; seals, restraint hooks, and control components are the items most likely to wear or be damaged. {note}
+
+### The Contractor shall furnish the Owner with the manufacturer's recommended spare parts for the dock equipment as scheduled.
+
+```datasheet
+label: Spare parts to be furnished
+type: checkbox
+options:
+ - Replacement seal pads / shelter curtains
+ - Restraint hook / engagement components
+ - Hydraulic seals and fittings
+ - Control panel components and indicator lamps
+default:
+ - Replacement seal pads / shelter curtains
+ - Control panel components and indicator lamps
+```