How to Review a Portable Earthing Set Drawing Before Production: Buyer Approval Checklist

A portable earthing set should not enter production only because the purchase order has been issued.

For custom or project-based portable earthing and short-circuiting equipment, the supplier normally needs to convert the approved RFQ, technical schedule, connection-point information, cable arrangement, clamps, and fault-duty requirement into a controlled assembly drawing.

That drawing becomes an important pre-production control document.

For utility buyers, EPC contractors, consultants, and technical procurement teams, the main review question is not:

Does the drawing look complete?

A stronger question is:

Does the proposed production drawing accurately represent the approved project requirement, and is the configuration supported by the required technical evidence?

The key approval chain is:

Approved RFQ → Supplier Drawing → Technical Review → Comments → Revised Drawing → Approval → Release for Production → FAT

The purpose of drawing approval is to identify configuration errors before manufacturing begins.

Follow local regulations and your site safety procedure.

Quick Answer: What Must Be Approved Before Manufacturing?

Before releasing a portable earthing set for production, buyers should confirm:

1. Drawing number and revision
2. Correct project and PO reference
3. Approved connection topology
4. Number of phase and earth leads
5. Individual cable cross-sections
6. Individual cable lengths
7. Phase clamp models and interfaces
8. Earth clamp model and interface
9. Ferrules and terminations
10. Connecting cluster or common point
11. Operating pole and adapters
12. Fault-current duty reference
13. Compatibility with supporting test evidence
14. BOM consistency
15. Marking and traceability
16. Declared technical deviations
17. Closed review comments
18. Final production-release status

A strong drawing-review process follows:

Specification → Configuration → Interfaces → Evidence → Revision Control → Approval

The drawing should translate an approved procurement requirement into a manufacturable assembly.

It should not silently rewrite the requirement.

For the upstream specification stage, see how to specify a portable earthing kit in a tender.

Why the Production Drawing Is a Control Document

A portable earthing set may contain:

• Phase clamps
• Earth clamp
• Flexible conductors
• Phase leads
• Earth lead
• Ferrules
• Lugs
• Connecting cluster
• Common connection point
• Adapters
• Insulating operating pole
• Storage accessories

These components work as one system.

The drawing should therefore do more than show the product shape.

It should define the approved configuration.

A controlled production drawing helps connect:

Buyer requirement

to

Supplier proposal

to

Manufacturing

to

FAT

to

Delivered product

If that link is weak, problems often appear later as:

• Wrong cable lengths
• Wrong clamp models
• Incorrect topology
• Missing accessories
• Unsupported substitutions
• BOM differences
• Fault-duty evidence that applies to another configuration

These issues are much easier to correct before production.

Step 1: Confirm Drawing Number, Revision, and Project Reference

Before reviewing the technical details, confirm that you are reviewing the correct document.

Check:

• Drawing title
• Drawing number
• Revision number
• Revision date
• Customer
• Project
• Purchase order
• Tender or contract reference
• Supplier model
• Item number
• Prepared-by information
• Checked-by information
• Approval status

This seems simple, but revision control is one of the most important parts of pre-production approval.

For example:

Revision A

• 50 mm² cables
• 1.5 m phase leads
• 3 m earth lead
• Clamp model A

Revision B

• 70 mm² cables
• 2 m phase leads
• 5 m earth lead
• Clamp model B

If the project approved Revision B but production uses Revision A, the final product can be wrong even though both drawings look technically complete.

Check the revision before checking the components.

Do not release production from an uncontrolled screenshot, quotation attachment, or old email drawing when the project requires formal document control.

Step 2: Compare the Drawing With the Approved RFQ

The next step is to compare the supplier drawing with the approved procurement requirement.

Review the major engineering inputs:

• Application
• AC or DC system
• System context
• Approved fault-current duty
• Rated time
• Peak-current requirement where applicable
• Number of phases
• Earthing arrangement
• Connection points
• Cable cross-section
• Cable lengths
• Clamp interfaces
• Earth connection
• Operating-pole requirement
• Accessories
• Marking
• Documentation

The supplier drawing should reflect the accepted technical offer.

It should not introduce new assumptions.

For example, if the RFQ states:

70 mm² flexible copper conductors

the production drawing should not show:

50 mm²

without an approved technical deviation.

Likewise, if the project requires:

flat-busbar phase clamps

the supplier should not replace them with another clamp type without declaring the change.

The supplier drawing should translate the approved specification into a manufacturable assembly, not silently modify the specification.

Step 3: Verify the Connection Topology

“Three-phase portable earthing set” does not define one universal arrangement.

The drawing should clearly show how the complete current path is arranged.

Check:

• Number of phase clamps
• Number of phase leads
• Phase-to-phase connections
• Phase-to-earth path
• Common cluster
• Individual earth leads
• Common earth lead
• Branch arrangement
• Neutral connection where applicable
• Earth connection point

A buyer should be able to understand the electrical topology without guessing from the cable count.

For example, the project may require:

Three phase branches → common cluster → one earth lead

or:

Three independent phase-to-earth leads

These are different assemblies.

For a detailed explanation, see phase-to-phase and phase-to-earth connections in portable earthing sets.

During drawing approval, the question is simpler:

Does the supplier drawing show the same topology that the engineer approved?

Step 4: Review Every Cable and Lead Separately

Do not approve the drawing from one general cable statement.

A multi-phase assembly may contain several different lead lengths.

Review each lead separately.

A useful schedule can look like this:

Depending on the project, also confirm:

• Cable construction
• Sheath or insulation
• Color
• Flexible conductor requirement
• Identification
• Termination type

Avoid one vague drawing note such as:

Cable length: 5 m.

That does not explain whether 5 m refers to:

• Every phase lead
• Total cable length
• Earth lead
• One branch
• Complete assembly

For technical approval, each important lead should be identifiable.

Step 5: Compare Lead Lengths With Site Geometry

Cable length should not be approved from the supplier drawing alone.

Compare the proposed lengths with the actual connection geometry.

Useful engineering inputs include:

• Phase spacing
• Busbar spacing
• Equipment width
• Connection-point position
• Earth-point location
• Equipment height
• Cabinet depth
• Approved cable route
• Access restriction

The purpose is not to create a field installation procedure.

The purpose is to answer:

Does the proposed assembly physically fit the approved connection points?

For example, an earth lead that is technically suitable in cross-section may still be unsuitable if the approved earth point is farther away than the proposed cable can reach.

Likewise, excessively long leads may affect:

• Handling
• Storage
• Routing
• Assembly geometry
• Technical evidence

Do not approve cable length from the principle:

Longer is safer.

The required length should come from the approved project geometry.

Step 6: Match Phase and Earth Clamps to the Actual Interfaces

The words:

universal clamp

are not enough for drawing approval.

Each clamp should be linked to a real connection point.

For phase clamps, review:

• Clamp model
• Jaw design
• Jaw opening range
• Flat or round conductor interface
• Busbar dimensions
• Conductor diameter
• Ball-stud interface where applicable
• Contact-face design
• Cable connection
• Operating-pole interface

For the earth clamp, review:

• Earth bar
• Rod
• Stud
• Fixed terminal
• Structural earth point
• Other approved connection geometry

The drawing or BOM should identify which clamp is used at each location.

A clamp should be approved against an interface, not only against a product name.

A photograph may help explain the site condition, but dimensions are more useful when clamp fit depends on geometry.

Step 7: Review Ferrules, Terminations, and the Connecting Cluster

Cable cross-section is only one part of the current path.

The drawing package should also identify how the flexible conductor connects to:

• Phase clamp
• Earth clamp
• Connecting cluster
• Lug
• End fitting

Review:

• Ferrule reference
• Lug reference where applicable
• Cable-to-clamp connection
• Cable-to-cluster connection
• End fitting
• Strain-relief arrangement where specified
• Component reference

The production drawing does not always need to show every manufacturing detail.

However, the termination should be defined well enough to prevent uncontrolled substitution.

Do not approve the conductor size while leaving the termination undefined.

For detailed termination inspection criteria, see grounding cable terminations: ferrules, lugs, and clamp connections.

Do Not Ignore the Cluster

For clustered multi-phase sets, the common connection point is part of the complete current path.

Check:

• Cluster model
• Number of branches
• Cable connection method
• Earth-lead connection
• Component reference
• Arrangement in the assembly

A cluster is not simply an accessory between several cables.

Its configuration can be relevant to the complete assembly evidence.

Step 8: Compare the Production Drawing With Fault-Duty Evidence

This is one of the most important approval steps.

The drawing may look correct geometrically but still differ from the configuration supported by the supplier’s test evidence.

For portable earthing and short-circuiting equipment, buyers should review:

• Rated current
• Rated time
• Peak-current basis
• Cable cross-section
• Cable lengths
• Phase clamps
• Earth clamp
• Ferrules
• Cluster
• Branch arrangement
• Complete tested configuration

The production drawing should be compared with the drawing or configuration referenced by the supporting evidence.

For example:

Tested Configuration

• 70 mm² conductor
• Clamp A
• Ferrule F1
• Cluster C1
• Defined branch arrangement

Proposed Production Drawing

• 50 mm² conductor
• Clamp B
• Ferrule F2
• Cluster C2
• Different lead arrangement

These should not automatically be treated as the same product because both documents show:

25 kA.

A buyer should ask:

Does the available fault-duty evidence actually support the configuration shown on the production drawing?

For a detailed rating review, see portable earthing kit fault-current rating.

Compare Three Technical Configurations Before Approval

A strong review normally connects three different engineering references.

1. Project Requirement

This describes what the site needs.

It may include:

• Connection points
• Required topology
• Fault duty
• Distances
• Access conditions

2. Tested Configuration

This shows what the supplier’s technical evidence actually supports.

It may identify:

• Cable
• Clamp
• Ferrule
• Cluster
• Lead arrangement
• Test duty

3. Proposed Production Drawing

This shows what the factory intends to manufacture.

Before approval:

Production Drawing must match the Project Requirement

and

Technical Evidence must support the Production Drawing

After manufacturing, a fourth comparison is added:

4. Finished Product

That becomes part of FAT.

This creates a clean evidence chain:

Project requirement → Tested configuration → Approved production drawing → Finished assembly

Step 9: Check the Drawing Against the BOM

Do not review the assembly drawing without the Bill of Materials.

A drawing can be technically correct while the BOM still contains the wrong component.

For example:

Drawing

Phase clamp: C-100

BOM

Phase clamp: C-120

If manufacturing follows the BOM, the finished equipment may not match the approved drawing.

Check:

• Drawing item number
• BOM item number
• Component name
• Part number
• Quantity
• Material where specified
• Component revision
• Supplier model

Typical BOM items may include:

• Phase clamps
• Earth clamp
• Phase cables
• Earth cable
• Ferrules
• Lugs
• Cluster
• Adapters
• Operating pole
• Pole head
• Storage bag
• Labels
• Accessories

A correct drawing with an inconsistent BOM can still produce the wrong product.

Both documents should be aligned before production release.

Step 10: Confirm Operating Poles, Adapters, and Accessories

Portable earthing set drawings often focus on cables and clamps.

Do not forget the operating equipment.

If the supply includes an insulating operating pole, confirm:

• Pole type
• Fixed, sectional, or telescopic design
• Required working length
• Collapsed length where relevant
• Head type
• Clamp interface
• Adapter
• Storage bag
• Quantity

The most important interface question is:

Does the operating pole actually connect to the selected clamp mechanism?

A correct pole and a correct clamp can still be incompatible if their interfaces differ.

Also confirm other project accessories such as:

• Storage case
• Transport bag
• Spare clamps
• Spare adapters
• Labels
• Inspection tags

If these are part of the approved supply scope, they should appear in the drawing package or BOM.

Step 11: Define Marking and Traceability Before Production

Do not wait until FAT to decide how the product will be identified.

The approved technical package should define the required marking system.

Depending on the project, this may include:

• Kit ID
• Serial number
• Cable identification
• Cable cross-section
• Cable length
• Clamp ID
• Component number
• Customer asset number
• Batch reference
• Rating reference
• QR code
• Project name

The identification system should connect:

Physical set → production record → drawing → test evidence → FAT record → delivery documents

For lifecycle control, see identification and traceability for portable earthing sets.

If markings must appear in specific positions, define them before manufacturing.

This is especially useful for:

• Large orders
• Multiple kit configurations
• Utility projects
• EPC packages
• Projects with component-level traceability

Step 12: Identify Technical Deviations

A supplier drawing should not hide technical deviations.

Suppose the RFQ requires:

70 mm² copper conductor.

The supplier drawing shows:

50 mm².

The buyer should not be expected to discover that difference manually without a deviation statement.

Likewise, deviations may include:

• Different clamp model
• Different conductor material
• Different cable length
• Different topology
• Different ferrule
• Different cluster
• Different operating pole
• Different accessories
• Different marking
• Different supporting evidence

A strong technical submittal separates:

Compliant requirement

from

Approved alternative

from

Technical deviation

Every material technical deviation should be declared, not hidden inside a revised drawing.

This makes approval more transparent and protects both buyer and supplier from later disputes.

Step 13: Control Review Comments and Drawing Revisions

Drawing comments should be traceable.

Avoid relying only on:

• WhatsApp messages
• Verbal discussions
• Marked screenshots
• Uncontrolled email instructions

For project orders, use a comment register or controlled drawing-markup process.

For example:

The purpose is not to create unnecessary paperwork.

It is to make sure:

The factory knows exactly which comments have been incorporated into the production version.

Drawing Approval Status Should Be Clear

Different EPC companies, utilities, and consultants use different approval codes.

A project may use statuses such as:

The exact terminology should follow the contract.

Do not assume every organization uses the same approval code.

The important point is:

The manufacturing team should be able to tell whether the drawing is formally released for production.

A Purchase Order Is Not Automatically a Drawing Approval

This distinction matters for custom equipment.

A buyer may issue the PO first and complete technical submittal approval afterward.

In that case:

Purchase Order

does not automatically mean:

Approved for Production

unless the contract specifically says otherwise.

For project-specific portable earthing equipment, a controlled workflow may be:

PO issued

↓

Supplier drawing submitted

↓

Buyer comments

↓

Revised drawing

↓

Technical approval

↓

Production release

This reduces the risk of manufacturing an assembly that later needs to be changed.

When Is a Drawing Ready for Production Release?

Before approving manufacturing, ask:

Is the revision correct?

No open revision conflict.

Does the drawing match the RFQ?

No uncontrolled technical change.

Is the topology correct?

The required current path is clear.

Are all important leads defined?

Cross-section and individual length are shown.

Are clamps matched to real interfaces?

No generic or assumed interface.

Are terminations and cluster defined?

The complete current path is controlled.

Does the evidence support the configuration?

No unexplained gap between tested and offered design.

Does the BOM match the drawing?

No component inconsistency.

Are operating poles and accessories included?

The complete scope is controlled.

Are markings defined?

Traceability can be implemented during manufacturing.

Are all technical deviations approved?

No hidden alternative.

Are review comments closed?

No unresolved technical action.

If these questions cannot be answered, production release may be premature.

Portable Earthing Set Drawing Review Checklist

This checklist can be used as a practical technical-review worksheet before manufacturing begins.

Common Drawing Approval Mistakes

Approving From the Product Name Alone

“Three-phase grounding set” does not define the complete assembly.

Reviewing an Obsolete Revision

Production may follow different technical data from the approved version.

Checking Cable Cross-Section but Not Individual Lengths

Correct cable size does not prove correct geometry.

Ignoring Actual Clamp Interfaces

A clamp must match the physical connection point.

Approving Topology Without Checking Site Geometry

A theoretically correct arrangement may still not fit the intended connection points.

Not Comparing the Drawing With Test Evidence

The production configuration may differ from the tested configuration.

Ignoring Ferrules and Terminations

The cable-to-clamp interface is part of the complete current path.

Ignoring the Connecting Cluster

The common point can be part of the supported assembly configuration.

Allowing the BOM to Differ From the Drawing

Manufacturing may follow the wrong component list.

Leaving Operating-Pole Interfaces Undefined

The supplied pole may not fit the clamp mechanism.

Accepting Hidden Technical Deviations

Differences should be declared before approval.

Approving Through Uncontrolled Messages

The factory may not know which revision is final.

Starting Production Before Comments Are Closed

The project may later require rework.

Waiting Until FAT to Discover a Drawing Error

FAT should verify production against an approved drawing, not become the first detailed engineering review.

How We Review a Portable Earthing Set Drawing Before Production

When we prepare a project-specific portable earthing set for production, we review the technical package in a fixed sequence.

We Confirm the Current Drawing Revision

We make sure engineering, production, sales, and the customer are reviewing the same document.

We Compare the Drawing With the Approved RFQ

We check the required fault duty, interfaces, topology, cables, accessories, and documentation.

We Confirm the Connection Topology

We identify the phase and earth current path clearly.

We Check Each Lead Separately

We review conductor material, cross-section, and length for each phase and earth lead.

We Compare the Layout With Site Geometry

We review the approved connection distances and interface information supplied by the customer.

We Match Each Clamp to Its Connection Point

Phase clamps and earth clamps are checked against the actual interface.

We Review Ferrules and the Cluster

The complete current path is reviewed as one assembly.

We Compare the Drawing With Technical Evidence

We check whether the proposed production configuration remains supported by the declared fault-duty evidence.

We Compare the Drawing With the BOM

Component references and quantities should agree.

We Confirm Operating Poles and Accessories

The complete delivery scope is reviewed before release.

We Define Marking and Traceability

Kit IDs and component identification are included in the production requirements where required.

We Record Technical Deviations

Any proposed difference from the approved requirement is made visible.

We Close Review Comments

A revised controlled drawing is issued when technical changes are required.

We Release the Approved Revision to Production

Manufacturing should follow the final controlled document.

After production, the next control point is FAT.

Our factory acceptance checklist for portable earthing and short-circuiting sets explains how the finished assembly should then be compared with the approved drawing.

FAQ About Portable Earthing Set Drawing Approval

Should a Portable Earthing Set Drawing Be Approved Before Production?

For custom, project, tender, or technically controlled orders, drawing approval is often an important part of the supplier-submittal process. The exact approval requirement should follow the contract, purchaser specification, and project procedure.

What Should a Portable Earthing Set Drawing Show?

It should identify the complete configuration, including topology, cables, individual lengths, phase clamps, earth clamp, terminations, cluster, operating pole, accessories, relevant technical references, and identification requirements.

Is a Quotation Drawing the Same as an Approved Production Drawing?

Not automatically. A quotation drawing may be preliminary. The production drawing should reflect the final approved technical configuration and controlled revision.

Should the Test-Report Drawing Match the Production Drawing?

The buyer should be able to understand how the available technical evidence relates to the proposed production configuration. Material differences should be declared and reviewed.

Does an Approved Drawing Prove the Fault-Current Rating?

No. The drawing defines the proposed configuration. The declared fault-duty rating still needs suitable supporting technical evidence.

Should Each Cable Length Be Shown Separately?

For multi-lead assemblies, this is good procurement practice because different phase and earth leads may require different lengths.

What Happens if the Supplier Changes a Clamp After Drawing Approval?

The change should be technically reviewed. Depending on the project and significance of the change, a revised drawing, deviation approval, and review of supporting evidence may be required before production continues.

Is a Purchase Order Enough to Start Manufacturing?

That depends on the contract. If technical drawing approval is required, PO issuance should not automatically be treated as production approval.

Practical Buyer Summary

A portable earthing set drawing should be reviewed as a configuration-control document, not as a product illustration.

Before production, confirm:

• Drawing number
• Revision
• Project reference
• Connection topology
• Cable material
• Cable cross-sections
• Individual lead lengths
• Phase clamps
• Earth clamp
• Ferrules
• Terminations
• Connecting cluster
• Operating pole
• Adapters
• Accessories
• Fault-duty reference
• Supporting technical evidence
• BOM
• Marking
• Traceability
• Technical deviations
• Review comments
• Approval status

The strongest approval chain is:

Approved RFQ → Site and Interface Data → Supplier Drawing → BOM → Technical Evidence → Comment Closure → Approved Revision → Production → FAT

The drawing-review stage is where the buyer can confirm that the factory is about to manufacture the correct assembly.

FAT comes later.

FAT should verify that the finished product matches the approved production drawing.

It should not be the first time the project discovers that the cable lengths, clamps, topology, or BOM were wrong.

For the full procurement sequence, buyers can start with how to specify a portable earthing kit in a tender, review portable earthing kit fault-current ratings, and then use our portable earthing set FAT checklist after manufacturing.

For available configurations, see our portable earthing and short-circuiting kits.

Follow local regulations and your site safety procedure.