High-Voltage Series-Circuit Cable
AGL Primary Cable (L-824)
Electrical backbone of the airport series circuit
Primary cable for airport series-circuit airfield lighting systems, selected according to voltage, conductor size and installation requirements.
Supplied by Precision AGL Solutions
Product Overview
AGL Primary Cable (L-824)
What It Is
AGL Primary Cable (L-824) carries high-voltage series-circuit power between the Constant Current Regulator (CCR), field isolating transformers and associated airfield ground lighting components.
It forms the electrical backbone of an airport series-circuit lighting system, providing suitable insulation, mechanical protection and environmental performance while remaining compatible with the selected primary connectors, transformers and jointing systems.
What We Supply
Precision AGL Solutions supplies primary cable configurations selected according to system voltage, conductor size, insulation construction, installation method and project requirements.
A continuous primary circuit supplies multiple fixtures. The cable may also be routed between field connection points and through approved cable joints or splices, so selection should be performed as part of the complete AGL circuit design.
The primary cable forms a closed loop from the CCR out to the field transformers and back to the CCR. A single open-circuit fault (cable break, failed connector or joint) stops current in the whole loop, which is why cable, joint and connector quality govern circuit reliability.
CCRConstant Current Regulator
Primary CableL-824
Primary ConnectorL-823
Isolating TransformerL-830
Secondary ConnectionFixture lead
AGL FixtureLight fixture
Applications
Where L-824 Primary Cable Is Used
Runway lighting circuitsSeries-circuit applications.
Taxiway lighting circuitsSeries-circuit applications.
Approach lighting circuitsSeries-circuit applications.
Apron & associated circuitsApron and associated AGL circuits.
Underground circuitsUnderground airfield lighting circuits.
Field transformer connectionsConnections at field isolating transformers.
CCR-to-field runsCCR-to-field cable runs.
Transformer-to-transformer sectionsSeries-circuit sections, joint and splice locations.
Installation & rehabilitationNew installations, rehabilitation, replacement, maintenance and extension of existing series circuits.
Series-Circuit Function
Carrying the Controlled CCR Current
Consider the Cable Together With
- CCR rated current
- Series-circuit operating characteristics
- Number and type of connected fixtures
- Isolating transformer ratings
- Primary connector configuration
- Cable route length
- Cable installation method
- System insulation requirements
Why It Matters
The primary cable carries the controlled current supplied by the AGL CCR through the series circuit.
A cable selection that does not match the complete circuit design can affect system reliability, insulation performance and maintenance requirements. Series circuits are normally regulated at up to 6.6 A (FAA 3-step regulators: 4.8, 5.5 and 6.6 A; 5-step: 2.8, 3.4, 4.1, 5.2 and 6.6 A), although some legacy installations use 20 A, so conductor size and insulation are chosen with the circuit length, regulator output voltage and transformer load, not the current alone.
Cable Construction
Technical Characteristics
Depending on the Selected Configuration
- Conductor material
- Conductor size
- Conductor construction
- Primary insulation
- Screen or shielding arrangement
- Protective sheath
- Overall cable diameter
- Temperature rating
- Mechanical characteristics
- Environmental resistance
Confirm the exact construction from the applicable product datasheet before procurement.
Electrical Selection
Conductor Size, Voltage Rating and Insulation
Conductor Size
Select according to the series-circuit design and project requirements.
- Circuit length
- Operating current
- Cable impedance
- System voltage
- Installation conditions
- Required electrical performance
- Project specification
Coordinate with the CCR, transformers, connectors and complete circuit design.
Voltage Rating
The cable must suit the electrical environment of the airport series circuit.
- Circuit operating voltage
- Maximum circuit voltage
- Insulation system
- CCR characteristics
- Series-circuit configuration
- Installation environment
- Applicable specification
Verify the voltage class against the complete system design and project requirements.
Insulation System
Provides electrical separation between conductor and surrounding environment.
- Insulation material
- Insulation thickness
- Dielectric strength
- Insulation resistance
- Temperature capability
- Moisture resistance
- Compatibility with connector and jointing systems
Must suit both the electrical requirements and installation environment.
Screen & Sheath
Screen, Shielding and Outer Sheath
Screen and Shielding
Where specified, the cable may incorporate a screen or shielding arrangement appropriate to the AGL cable design.
Consider screen construction and termination during installation and jointing. Where screening is present, follow the approved cable manufacturer’s termination and grounding/bonding requirements.
Outer Sheath
Provides additional protection to the cable construction. Relevant properties:
- Mechanical protection
- Moisture resistance
- Environmental resistance
- Abrasion resistance
- Temperature performance
- Compatibility with underground installation
The sheath should suit the intended installation method.
Underground Installation
Most Airport Primary Cable Networks Are Buried
Underground Installation Requires Consideration Of
- Cable route
- Burial depth
- Duct or direct-burial arrangement
- Soil conditions
- Drainage
- Mechanical protection
- Crossing points
- Cable identification
- Future maintenance access
Installation should follow the approved airport civil and electrical design.
Bending & Handling
Bending Radius, Pulling and Handling
Cable Bending Radius
Excessive bending can damage cable insulation or alter the internal construction. During installation:
- Respect the manufacturer’s minimum bending radius
- Avoid sharp bends
- Prevent excessive pulling tension
- Use appropriate cable handling equipment
- Avoid twisting the cable
- Protect the cable at entry and exit points
Take the minimum bending radius from the selected cable’s technical documentation.
Cable Pulling and Handling
- Suitable cable drums
- Controlled cable payout
- Appropriate pulling equipment
- Pulling tension limits
- Bend-radius control
- Protection from sharp edges
- Avoidance of dragging over abrasive surfaces
- Proper temporary storage
- Protection of cable ends
Damage during installation may not be immediately visible and can later result in insulation or circuit faults.
Compatibility
Connector, Transformer and Joint Compatibility
Primary Connector Kit (L-823)
Select the cable and connector as a matched connection system. Check:
- Conductor size
- Conductor construction
- Cable insulation
- Cable outside diameter
- Voltage class
- Connector termination method
- Sealing arrangement
Isolating Transformer (L-830)
L-824 Primary Cable → L-823 Primary Connector → L-830 Isolating Transformer
Confirm compatibility for:
- Transformer primary lead
- Connector configuration
- Cable dimensions
- Electrical rating
- Installation environment
Joint / Splice Kit
Where the route requires a joint or splice, the kit must be compatible with the cable construction:
- Conductor size
- Insulation construction
- Cable diameter
- Screen configuration, where applicable
- Voltage class
- Sealing requirements
- Environmental conditions
- Approved jointing procedure
Do not select a joint kit solely by conductor size. See Joint / Splice Kit.
Technical Data
AGL Primary Cable Specification
| Parameter | Specification |
|---|---|
| Product Type | AGL Primary Series-Circuit Cable |
| Designation | L-824 |
| Application | Airfield Ground Lighting (AGL) series circuits |
| Conductor | Model/project-specific |
| Conductor Size | Project-specific |
| Conductor Construction | Configuration-specific |
| Voltage Rating | 5,000 V class (primary series circuits) or 600 V class, per AC 150/5345-7F; confirm for the model |
| Insulation | Model-specific |
| Screen / Shield | Configuration-specific |
| Outer Sheath | Model-specific |
| Temperature Rating | Model-specific |
| Overall Diameter | Model-specific |
| Minimum Bending Radius | Manufacturer specified |
| Installation Method | Underground / project-specific |
| Cable Length | Drum / project-specific |
| Primary Connector Compatibility | According to cable construction |
| Joint / Splice Compatibility | According to selected cable |
| Weight | Model-specific |
| Compliance | Applicable FAA/project requirements |
Selection Procedure
Follow the Complete AGL Circuit Design
1. Establish the Circuit
- Runway, taxiway or approach circuit
- CCR location
- Field transformer locations
- Number of connected fixtures
- Approximate circuit length
2. Confirm Electrical Requirements
- Series-circuit current
- Voltage environment
- Required cable conductor size
- Frequency
- System insulation requirements
3. Confirm Installation Method
- Direct buried
- Installed in ducts
- Installed in conduits
- Routed through transformer pits
- Part of an existing cable network
4. Confirm Connector Requirements
- L-823 primary connectors
- Isolating transformer leads
- Joint/splice kits
- Existing field equipment
5. Confirm Project Requirements
- Airport authority specifications
- Applicable FAA requirements
- Project drawings
- Cable schedules
- Installation standards
- Testing requirements
Circuit Applications
Runway, Taxiway and Approach Circuits
Runway Circuits
- Runway edge lights
- Runway threshold lights
- Runway end lights
- Runway centreline lights
- Touchdown zone lights
Coordinate cable sizing and installation with the complete runway lighting circuit. Stop bars and runway guard lights protect the runway but are located at taxiway holding positions, so they are normally served from taxiway circuits (see Taxiway Circuits).
Taxiway Circuits
- Taxiway edge lighting
- Taxiway centreline lighting
- Stop bars
- Runway guard lights
- Holding position lighting
- Other series-circuit taxiway systems
Take special care over cable routing where multiple taxiways and pavement crossings create complex underground networks.
Approach Lighting
Primary cable may form part of suitable approach lighting series circuits. Coordinate with:
- Approach lighting configuration
- Field transformer locations
- Cable route
- Circuit length
- CCR characteristics
- Connector and jointing requirements
Route Planning
Cable Route Planning
Route design matters for both electrical performance and long-term maintenance.
Consider
- Total circuit length
- Number of cable joints
- Transformer locations
- Pavement crossings
- Duct routes
- Service crossings
- Drainage
- Future expansion
- Access for maintenance
- Identification and documentation
Minimizing unnecessary joints can simplify maintenance and reduce potential failure points.
Installation
Installation Considerations
During Installation
- Confirm cable drum identification
- Inspect cable before installation
- Verify cable type and construction
- Maintain approved pulling tension
- Maintain minimum bending radius
- Protect cable ends from moisture
- Prevent mechanical damage
- Maintain appropriate separation from other services
- Identify cable routes accurately
- Record joint and termination locations
Assess any damaged section according to the approved cable inspection and repair procedure before placing it into service.
Lightning Protection
Counterpoise and Earthing
In FAA practice a bare counterpoise conductor is laid in the cable trench above the primary cable and bonded as designed, for lightning protection (AC 150/5340-30J and AC 150/5370-10, Item L-108). Indian and other projects follow the airport design and national earthing standards. Confirm the counterpoise size, bonding points and test requirements with the approved design before the cable is installed.
Testing & Commissioning
Test According to the Approved AGL Procedure
Depending on the Project, Testing May Include
- Visual inspection
- Conductor continuity
- Insulation resistance
- High-voltage or dielectric testing where specified
- Cable identification
- Joint inspection
- Connector inspection
- Series-circuit verification
- Transformer connection verification
Base testing voltage, duration and acceptance criteria on the applicable project procedure and the cable manufacturer’s requirements.
Maintenance
Part of the Overall AGL Maintenance Program
Inspection May Include
- Accessible cable terminations
- Transformer pit connections
- Primary connectors
- Cable joints
- Signs of moisture ingress
- Insulation deterioration
- Mechanical damage
- Cable identification
- Evidence of overheating or electrical distress
Underground cable faults may require sectional testing to locate the affected portion of the circuit.
Troubleshooting
Symptoms and Possible Causes
Open Series Circuit
- Cable break
- Failed primary connector
- Failed joint
- Transformer connection fault
- Damaged conductor
- Incorrect termination
Insulation Fault
- Damaged insulation
- Moisture ingress
- Cable mechanical damage
- Failed joint
- Connector sealing problem
- Installation damage
Repeated Cable or Joint Failure
- Cable selection
- Installation method
- Excessive pulling tension
- Minimum bending radius
- Jointing procedure
- Environmental exposure
- Mechanical damage
- Water ingress
Investigate at system level rather than simply replacing the visible failed component.
Replacement & Rehabilitation
Primary Cable Replacement
Replacement May Be Required During
- Runway rehabilitation
- Taxiway reconstruction
- Lighting modernization
- Circuit extension
- Pavement reconstruction
- Repeated cable-fault remediation
- Replacement of obsolete cable systems
Before Replacing, Document
- Existing cable type
- Conductor size
- Route
- Circuit length
- Existing connector type
- Transformer configuration
- Joint locations
- Existing test results
Where new cable is installed into an existing series circuit, verify compatibility with the existing cable, connectors and transformers.
Procurement Checklist
When Requesting AGL Primary Cable, Provide
Information Required
- Cable designation
- Required conductor size
- Voltage class
- Insulation requirements
- Screen/shield requirements
- Sheath requirements
- Approximate cable length
- Installation method
- Operating current
- Operating frequency
- Primary connector type
- Joint/splice requirements
- Airport/project specification
- Required drum lengths
- Quantity
For an existing installation, a cable datasheet, cable marking or photograph of the cable identification can help confirm the required construction.
Safety
Electrical Safety — Isolation and Lock-Out
WARNING — never open a live series circuit. An open series circuit driven by a constant-current regulator can produce dangerously high voltage. Opening, cutting or disconnecting any part of an energised circuit can cause serious injury or death and damage equipment.
- De-energise the circuit at the regulator and apply the site lock-out / tag-out (LOTO) procedure before any work
- Where the circuit must be isolated or shorted, use the series circuit cut-out switch or approved isolation device — not an improvised bypass
- Verify the circuit is de-energised and the output is isolated before touching conductors, connectors, splices or transformers
- Work only under the airport's permit-to-work system, using qualified personnel and the manufacturer's instructions
- After any insulation-resistance or high-voltage test, discharge the cable and apply temporary earths before handling conductors, as cable capacitance can hold a dangerous charge
- Follow the applicable national electrical safety regulations and site procedures
Specification
Voltage Classes and Cable Specification
L-824 underground electrical cable for airport lighting series circuits is specified in the FAA AC 150/5345-7F series (Specification for L-824 Underground Electrical Cable for Airport Lighting Circuits). The standard defines 5,000 V and 600 V insulation classes. The 5,000 V class is the normal choice for primary series circuits; the 600 V class is typically used for secondary and other low-voltage runs. Select the class to suit the circuit design, and confirm the current AC edition and conductor/insulation construction with the manufacturer datasheet.
Standards & References
Associated Reference and Requirements
FAA L-824 Reference
L-824 cable is specified in FAA AC 150/5345-7F. Verify the applicable edition and revision for the airport project before procurement, because construction and acceptance requirements can vary with the authority.
Related Requirements
- FAA AC 150/5345-26E: L-823 connectors that terminate the cable
- FAA AC 150/5345-47C: isolation transformers (L-830)
- FAA AC 150/5370-10 (Item L-108): installation of underground airport power cable
- ICAO Doc 9157 Part 5: electrical systems
- Airport authority, national electrical and project AGL specifications
Documentation
Technical Documentation
Depending on the Selected Cable Configuration
- Product datasheet
- Cable construction details
- Conductor information
- Electrical characteristics
- Dimensional information
- Bending-radius information
- Installation instructions
- Test certificates
- Compliance documentation
- Drum identification and packing information
Project-specific cable schedules and technical submittals can be coordinated where required.
FAQ
AGL Primary Cable (L-824) — Frequently Asked Questions
What is L-824 primary cable used for?
L-824 primary cable carries high-voltage series-circuit power between the constant current regulator (CCR), the field isolating transformers and associated airfield ground lighting components. It is the electrical backbone of the series circuit and is used on runway, taxiway, approach, apron and other underground airfield lighting circuits.
Why can one cable fault stop a whole lighting circuit?
The primary cable forms a closed loop from the CCR out to the field transformers and back to the CCR. A single open-circuit fault, such as a cable break, failed connector or failed joint, stops current in the whole loop. This is why cable, joint and connector quality govern circuit reliability.
What does the FAA specify for L-824 cable?
L-824 underground electrical cable for airport lighting circuits is specified in the FAA AC 150/5345-7F series. It defines 5,000 V and 600 V insulation classes. The 5,000 V class is the normal choice for primary series circuits, while the 600 V class is typically used for secondary and other low-voltage runs. Confirm the current edition and the conductor and insulation construction on the manufacturer datasheet.
What series-circuit current does the cable carry, and how does it affect selection?
Series circuits are normally regulated at up to 6.6 A. FAA 3-step regulators use 4.8, 5.5 and 6.6 A, and 5-step regulators use 2.8, 3.4, 4.1, 5.2 and 6.6 A, although some legacy installations use 20 A. Conductor size and insulation are chosen with the circuit length, regulator output voltage and transformer load, not the current alone.
How must L-824 cable match L-823 connectors, L-830 transformers and joint kits?
Select the cable and connector as a matched connection system. Check conductor size, conductor construction, cable insulation, outside diameter and voltage class against the L-823 primary connector, and confirm the transformer primary lead and connector configuration for the L-830 isolating transformer. A joint or splice kit must suit the cable construction and should not be selected by conductor size alone.
How is primary cable installed on an airfield?
Most airport primary cable networks are buried, either direct-buried or in ducts. Installation should follow the approved airport civil and electrical design, with attention to route, burial depth, soil, drainage, crossings and future maintenance access. Respect the manufacturer minimum bending radius and pulling tension limits, because damage during installation may not be visible immediately and can later cause insulation or circuit faults.
Is a counterpoise needed with primary cable?
In FAA practice a bare counterpoise conductor is laid in the cable trench above the primary cable and bonded as designed, for lightning protection, under AC 150/5340-30J and AC 150/5370-10 (Item L-108). Indian and other projects follow the airport design and national earthing standards. Confirm the counterpoise size, bonding points and test requirements with the approved design before the cable is installed.
How is installed primary cable tested?
Depending on the project, testing may include visual inspection, conductor continuity, insulation resistance, high-voltage or dielectric testing where specified, cable identification, joint and connector inspection, series-circuit verification and transformer connection verification. Base the test voltage, duration and acceptance criteria on the applicable project procedure and the cable manufacturer requirements.
What are the common faults in primary cable circuits?
An open series circuit can come from a cable break, failed primary connector, failed joint, transformer connection fault, damaged conductor or incorrect termination. An insulation fault can come from damaged insulation, moisture ingress, mechanical damage, a failed joint or connector sealing problem. Underground faults may need sectional testing to locate the affected portion, and repeated failures should be investigated at system level rather than by replacing only the visible failed component.
Is it safe to work on primary cable while the circuit is energised?
No. An open series circuit driven by a constant-current regulator can produce dangerously high voltage, and opening, cutting or disconnecting any part of an energised circuit can cause serious injury or death. De-energise the circuit at the regulator, apply the site lock-out / tag-out procedure, use the series circuit cut-out switch or an approved isolation device rather than an improvised bypass, and work under the permit-to-work system. After any insulation-resistance or high-voltage test, discharge the cable and apply temporary earths, as cable capacitance can hold a dangerous charge. See the electrical safety warning on this page.
What should be confirmed before ordering L-824 primary cable?
Confirm the cable designation, conductor size, voltage class, insulation, screen or shield and sheath requirements, approximate length and drum lengths, installation method, operating current and frequency, primary connector type, joint or splice requirements, the airport or project specification and the quantity. For an existing installation, a cable datasheet, cable marking or a photograph of the cable identification helps confirm the required construction.
Why Precision AGL Solutions
Cable Selection Coordinated With the Series Circuit
Precision AGL Solutions supplies components for airport airfield ground lighting systems and understands the importance of coordinating cable selection with the complete series-circuit installation. We can assist with:
Our Support
- Primary cable selection
- Cable construction review
- Conductor sizing
- L-823 connector compatibility
- L-830 transformer compatibility
- Joint/splice compatibility
- Replacement cable identification
- AGL rehabilitation projects
- Technical documentation
Procurement Information for Indian Projects
Indian public tenders commonly ask for the documents below. State which ones your tender requires when you send the enquiry, so they are covered in the quotation.
- Manufacturer / OEM authorisation
- Country of origin and local-content declaration (for Make in India purchase preference)
- Type-test and routine-test certificates, and the FAA / ICAO / IEC compliance documents named in the specification
- Datasheets, drawings and installation instructions
- Warranty, delivery period and spares support
- GeM catalogue or tender-portal requirements, where applicable
Request AGL Primary Cable Selection
Planning a new airport lighting circuit or replacing existing AGL primary cable? Request a cable and connector compatibility review from Precision AGL Solutions. Send the available cable construction, conductor size, voltage requirements, installation method and existing connector information for evaluation. Send your cable requirements and existing connector details for a project-specific cable and connection compatibility review.
- Emailprecisionaglsolutions@gmail.com
- Websiterahulsharmaagl.in
- LinkedInPrecision AGL Solutions
- Phone+91 98214 96412
Engineering Note
Primary cable selection is configuration- and project-dependent. Conductor size, voltage rating, insulation system, screen/shield construction, sheath, temperature rating, cable dimensions, bending radius, installation method and connector/joint compatibility should be verified against the complete AGL series-circuit design before procurement. Final installation and testing should follow the approved cable manufacturer’s instructions and applicable airport/project requirements.
Product Disclaimer
Product availability, configuration, dimensions, electrical characteristics, photometric performance, certifications and compliance status depend on the selected manufacturer and project specification. The technical values published on this page should not be treated as a substitute for the manufacturer's current approved Technical Data Sheet.
Final selection shall be based on the approved project specification, applicable aviation standards, authority requirements, manufacturer documentation and site conditions. Use of this page is also subject to the Legal Notice, Disclaimer & Terms of Use.
Standards and editions referenced on this site are listed on the Standards Reference page.