Power cable screen grounding defines how the cable's metallic screen is connected, what current it may carry and how induced voltage is controlled. The screen, armor and separate protective or grounding conductor can have different functions and should not be treated as automatic substitutes.
Buyers need the system grounding method, earth-fault current, clearing time, route length, screen cross-section, bonding arrangement, joint and termination design, grounding-grid interface and acceptable voltage criteria. Power cable screen grounding belongs to qualified system engineering.
This page covers related procurement prompts about screen size, single-point or both-end bonding, cross-bonding, fault path, induced voltage, accessories, testing and handover records.
Screen Grounding Decision and Evidence Table
Use this specification table to compare each screen and grounding path review on the same approved project basis. Values are inputs to confirm, not assumptions for the supplier to invent.
| Specification item | Project input | Evidence to retain |
|---|---|---|
| Electrical system | Approved system grounding, earth-fault study, protection time and voltage criteria | Approved single-line diagram and load schedule |
| Conductor and size | Buyer-defined material, cross-section and circuit duty | Cable schedule and engineering approval |
| Insulation and sheath | Feeder length, phase arrangement, parallel routes, joints, substations and grounding points | Route map and environmental boundary |
| Mechanical protection | Screen wires, tapes, bonding leads and accessories protected through installation | Installation method and risk review |
| Fire performance | Project-required performance and test reference | Approved specification and test documents |
| Identification | Feeder, screen construction, joint, bonding point, grounding connection and test record | Drum list, cable register and final revision |
A compliant schedule makes technical and commercial differences visible before the cable screen grounding system cable order is released.
What must a screen grounding design answer?
A useful screen and grounding path review starts with a defined buyer, production outcome and project boundary. The following distinctions prevent a general factory inquiry from becoming an unqualified product request.
What is the screen's electrical duty?
Define shielding, earth-fault contribution and any continuous induced current.
Where is it bonded?
Identify termination, joint and grounding points on a controlled diagram.
What fault current applies?
Use the approved current path and protection clearing time.
How are voltages controlled?
Review induced and touch voltage for the route and bonding scheme.
The decision is strongest when each answer is supported by project-specific evidence for the cable screen grounding system.
Screen and grounding claim-to-evidence audit
The construction review should connect materials and components with actual cable screen grounding system routes.
- Screen construction: Material and cross-section match the approved fault duty; retain cable datasheet and calculation.
- Bonding arrangement: Connection points match the engineering diagram; retain bonding schedule.
- Accessory continuity: Joints and terminations preserve the intended path; retain compatibility and installation record.
- Commissioning evidence: Continuity and grounding checks are traceable; retain test report.
Power cable screen grounding evidence should connect factory construction with every installed bonding point. A grounding schedule should preserve that same connection logic through commissioning.
Scenario: the screen is large enough but bonded incorrectly
Situation: A feeder cable has an approved metallic screen sized for earth-fault duty.
Finding: One joint-bay bonding lead is installed differently from the released diagram.
Decision: The connection is held, identified and corrected before continuity and grounding tests are repeated.
Expected result: Power cable screen grounding matches the engineered current path instead of cable construction alone.
A screen grounding release workflow
The screen and grounding path review should follow named handoffs from production input to released output.
| Work stage | Primary owner | Required output |
|---|---|---|
| Define system | Production engineering | Electrical basis; confirm grounding method, fault case and protection. |
| Select screen | Plant engineering | Cable construction; confirm material, area and thermal withstand. |
| Design bonding | Quality team | Bonding diagram; confirm single-point, both-end or engineered arrangement. |
| Coordinate accessories | Construction team | Installation package; confirm joints, terminations and leads. |
| Test and hand over | Maintenance team | Grounding record; confirm continuity, connections, identity and revisions. |
The workflow prevents a correct cable screen from being undermined by an uncontrolled field connection.
Screen grounding review scorecard
Use this scorecard to test the quality evidence behind a screen and grounding path review. Certification names alone do not replace project-specific inspection and traceability.
| Criterion | Question | Evidence to request |
|---|---|---|
| Fault path | Is the screen duty tied to an approved earth-fault case? | Grounding study |
| Thermal fit | Can the screen withstand current and duration? | Calculation |
| Bonding fit | Are all points and accessories defined? | Bonding diagram |
| Field continuity | Can installed connections be verified and traced? | Test and location register |
Power cable screen grounding is accepted as a system of cable, accessories, connections and earth-grid interfaces.
Compare three screen bonding concepts
This comparison does not select a cable by industry label. It shows how three cable screen grounding system project configurations change the evidence a supplier must review.
| Project configuration | Defining features | Main advantage | Best fit | Relative cost level |
|---|---|---|---|---|
| Single-point concept | Screen bonded at a defined point | Limits circulating current | Qualified route | Medium |
| Both-end concept | Screen connected at both ends | Simple continuity | Routes with acceptable current | Medium |
| Engineered sectional bonding | Joint sections and bonding points coordinated | Controls long-route effects | Long MV feeders | High |
Power cable screen grounding concepts are engineering choices, not accessory options selected at installation.
Which bonding approach needs project review?
Which branch protects accepted cable system with a defined metallic screen and earth-fault path while meeting the required delivery date?
Short route with acceptable induced voltage
A simple bonding arrangement may be assessed against fault and voltage duty.
Long route
Review circulating current, induced voltage and an engineered bonding method.
Multiple joint sections
Control screen continuity and bonding at every joint bay.
Fault path is shared
Calculate current division among screens, armor and grounding conductors.
The selected arrangement must be supported by route-specific calculations and accessible records.
Commercial scope in screen grounding packages
The quoted price for a screen and grounding path review is meaningful only when route, quantity, testing, delivery and exclusions use the same basis.
| Cost driver | Project impact | Control before ordering |
|---|---|---|
| Screen area | More metallic material changes cable cost | Use fault calculation |
| Joint bays | More sections add accessories and labor | Map route |
| Bonding hardware | Leads, boxes and protection add scope | List equipment |
| Testing | Continuity and voltage checks require planning | Define ITP |
| Engineering | Long routes need studies and revisions | Name responsibility |
A complete quotation separates cable screen construction, bonding hardware, installation and engineering responsibility.
Screen grounding handover controls
OEM and project customization should make the screen and grounding path review easier to approve, receive, install and maintain.
Cable record
State screen material and cross-section.
Bonding register
Identify every joint, lead and connection.
Calculation file
Retain fault current, duration and voltage basis.
Test record
Link continuity and grounding results with feeder locations.
Information to include in a power cable RFQ
Suppliers can compare the same basis when the RFQ includes the following project inputs.
- System voltage and frequency
- Load or cable schedule
- Motor ratings and starting method
- Route length and installation method
- Actual wet, dusty, hot, outdoor or mechanical conditions
- Required conductor, insulation, sheath and armor details
- Destination, delivery stages and required records
- system grounding and fault current
- screen material, area and duration
- route length and phase arrangement
- bonding points, joints and link hardware
- installation, tests and handover records
For cable screen grounding system projects, references such as IEC 60502, IEC 60228 and IEC 60332 can help both sides use consistent terminology. They do not replace the approved specification or the buyer's responsibility to confirm the design.
How JINCHUAN Cable supports cable screen grounding system decisions
For medium-voltage buyers, EPC engineers, utilities, industrial owners and cable accessory teams evaluating the power cable screen grounding, JINCHUAN Cable can review buyer-approved schedules, metallic screen constructions, fault-duty data, cable dimensions, drum identity and accessory records, quantities, identification and document requirements for the cable screen grounding system.
The response can state assumptions, evidence and exclusions while final system design, protection, compliance approval and installation remain with qualified project teams responsible for the cable screen grounding system.
Buyers can review JINCHUAN Cable products and learn more about the JINCHUAN Cable company. Share the project purpose, critical loads, route conditions, quantities, destination and expected records to create a stronger basis for technical and commercial comparison.
Send the approved schedule and screen, bonding and earth-fault requirements to request a quotation with a traceable evidence package.
FAQ
What should buyers expect from a power cable screen grounding?
Buyers should expect the proposal to connect cable construction with metallic screen material, cross-section, earth-fault current, clearing time, bonding points, induced voltage, armor, grounding conductor and accessories, not merely repeat conductor sizes from a schedule.
Which part of the cable screen grounding system should be mapped first?
Start with system grounding study, fault-path definition, screen sizing, bonding selection, accessory coordination, installation inspection and commissioning. This shows which supporting loads can interrupt more than one production stage.
How should quotations for the cable screen grounding system be compared?
Compare the stated route assumptions, operating duty, included records, delivery grouping and exclusions beside price. That exposes scope differences before approval.
Which route conditions matter in a cable screen grounding system?
The inquiry should distinguish long feeders, joint bays, substations, parallel routes and areas where induced voltage or touch potential requires review. Broad labels such as indoor or industrial are rarely precise enough for a useful review.
What hidden risk deserves attention in this project?
A common hidden risk is treating cable screen, armor and separate grounding conductor as interchangeable without defining the actual fault-current path. Its production consequence may be greater than the connected load suggests.
Should future changes be discussed before ordering?
Yes. higher fault level, longer route, more joints, changed bonding points, new parallel circuits and revised protection time can affect route capacity, circuit names, distribution space and the value of today's approval records.
Which records help after installation?
Useful records include grounding study, fault duty, screen size, bonding diagram, accessory schedule, installation register, test results and revisions. They help receiving, installation and maintenance teams connect each cable with its purpose.
Which technical references may support the discussion?
IEC 60502, IEC 60228 and IEC 60332 may provide common terminology, while the approved project specification remains the final design basis.
What should be sent with the first RFQ?
Send the cable or load schedule plus project details such as system grounding and fault current, screen material, area and duration, route length and phase arrangement, bonding points, joints and link hardware, installation, tests and handover records. Clear inputs allow suppliers to identify assumptions instead of guessing.
How can JINCHUAN Cable support the cable screen grounding system?
JINCHUAN Cable can review the schedule, routes, operating conditions, quantities and required records against the result the buyer needs to protect: a screen construction and bonding arrangement connected with fault duty, induced voltage, grounding, accessories and test evidence.
