Modello di richiesta di offerta per rilevatori di alta tensione: scheda tecnica, matrice di conformità e registro delle deviazioni.

For power companies, EPC contractors, substation project procurement teams and distributors of electrical safety equipment, the most common issue when procuring high-voltage detectors is not a lack of suppliers, but rather the lack of comparability between quotations provided by different suppliers.

For example, three suppliers may all quote for a 35 kV voltage detector, but one may supply only the detector unit itself, another may include an insulated operating pole, whilst the third may employ a different detection principle or comply with different standards. If the procurement documentation merely specifies the product name and voltage rating, it becomes very difficult to make a fair technical comparison between these three quotations.

Consequently, an effective RFQ (Request for Quotation) should not merely require suppliers to provide a price, but should clearly specify the project’s electrical system, testing tasks, product configuration, applicable standards, technical documentation and requirements for reporting deviations.

This article provides a methodology for drafting a High Voltage Detector RFQ for B2B project procurement, including a Buyer’s Technical Input Form, a Supplier’s Technical Response Form, a Technical Compliance Matrix and a Deviation Register, to assist procurement teams in identifying specification discrepancies during the quotation stage and completing technical reviews prior to order confirmation.

For projects where the type of detector has not yet been determined, it is recommended to first clarify the actual testing tasks and operating conditions, and then have suppliers with the relevant technical capabilities propose solutions. This avoids locking in unsuitable product configurations too early during the RFQ stage.

Why a High Voltage Detector RFQ Needs More Than a Voltage Rating

Voltage rating is an important parameter when selecting a High Voltage Detector, but it cannot alone determine whether a product is suitable.

Procurement teams must distinguish between at least four dimensions:

These four items of information should correspond to one another in the RFQ.

For example, if the procurement team merely specifies “35 kV High Voltage Detector”, suppliers will still be unable to determine which detection principle, contact method or operating frequency the project requires, or whether an insulated operating rod is required.

If the project involves railway traction, energy storage systems or other DC electrical installations, it must also be made clear that the target system is DC; AC detectors cannot be used as substitutes based solely on voltage values.

For large-scale substation projects, it is recommended that the RFQ for voltage detectors be incorporated into the overall procurement plan for electrical safety equipment, whilst retaining a separate technical specifications sheet and acceptance criteria. This ensures consistency across project documentation without forcing different products to adhere to a single set of technical standards that may not be applicable.

Step 1: Define the Project and Electrical System

The first section of the RFQ should describe the project background and the actual electrical system, rather than directly specifying product models.

It is recommended that the buyer provide the following information.

An important principle to note here is that if the purchaser has already determined the detection principle and standards via the project specifications, these should be explicitly stated in the RFQ; if they have not yet been determined, the purchaser may request suppliers to provide technical proposals, specifying the scope of application and any matters requiring the purchaser’s confirmation.

The mere presence of a product in a supplier’s catalogue does not imply that it is suitable for the current electrical system.

Step 2: Specify the Detector Type and Detection Method

In the RFQ, ‘Detector Type’ and ‘Detection Method’ should be listed separately.

Different voltage detectors may employ different detection principles and methods of application. The purchaser should determine requirements based on actual work tasks, approved operating procedures and applicable standards, rather than selecting solely on the basis of product name or appearance.

It is recommended that the following fields be clearly specified in the RFQ.

If a contact-type voltage detector is used for the project, the actual contact points and contact conditions must be specified. If a non-contact detector is used, it must be confirmed that the device is suitable for the detection tasks required by the project.

‘Capacitive’ should not be equated directly with ‘non-contact’, nor should a detector be deemed to meet the requirements of all voltage verification scenarios merely because it features audible and visual alarms.

If the project has not yet decided on the detection principle, the supplier may be asked to list in their quotation the recommended solution, applicable conditions, technical basis and any restrictions relevant to the project requirements, for confirmation by the project’s technical lead.

For information on different detection principles and the scope of applicable standards, please refer to the article on this website: Rivelatori di alta tensione capacitivi vs resistivi: come gli acquirenti dovrebbero scegliere l'applicazione e l'ambito di applicazione standard.

Step 3: Define the Complete Supply Configuration

The RFQ must clearly specify exactly what the supplier is required to deliver.

If the procurement documents merely state ‘High Voltage Detector’, this may lead the supplier to assume they are only required to provide the detector unit itself, whilst the buyer actually requires a complete configuration comprising the detection head, insulated operating pole, adaptor, functional verification device and carrying case.

It is recommended to draw up a separate scope of supply table.

In particular, the compatibility between the tester and the insulated operating rod must be clearly established.

The fact that mechanical interfaces can be connected does not imply that full technical compatibility between the two components has been confirmed. The purchaser should require the supplier to provide accurate interface model numbers, connection drawings and the corresponding compatibility specifications.

For projects requiring the separate procurement of operating handles, the length, structural design, connectors and relevant technical documentation of the operating handles should also be verified to avoid mistaking the test report for the tester unit itself as comprehensive certification for the entire combined equipment set.

For guidance on reviewing the configuration of voltage detectors and operating poles, please refer to Come abbinare un rilevatore di tensione a un polo operativo.

Step 4: Specify Applicable Standards and Technical Documents

The RFQ should not merely state “compliant with IEC standards” or “provide test reports”.

Such wording fails to specify the exact standards, scope of application and versions, nor does it guarantee that the documentation provided by the supplier will support the actual models quoted.

It is recommended that the buyer categorise standards and technical documentation requirements into three tiers.

Tier 1: Applicable product standards.

Specify the standard number, section and version required for the project. If the project’s technical specifications have already designated applicable standards, these should take precedence. Should a supplier propose the use of other standards or solutions, any discrepancies must be reported as technical deviations and await approval.

Tier 2: Product test evidence.

Suppliers must be required to provide test reports or other agreed technical supporting documents that correspond to the quoted model, and to confirm that the reports cover the product structure, testing methods and performance scope.

Third tier: Delivery documentation.

Specify the product manuals, labelling materials, conformity documents, inspection records and product traceability information required upon final delivery.

It is recommended that the following list of documents be used in the RFQ.

Documentation requirements should be specified at the quotation stage, rather than being requested from the supplier at short notice only after the product has been completed.

For high-voltage testers, test reports must correspond to the specific type of tester, the applicable standards and the actual model. It is not sufficient to assume that the product complies with all procurement requirements merely because the report bears the words ‘IEC’ or ‘ASTM’.

For further information on how to review test reports, please refer to Come leggere il rapporto di prova di un rilevatore di alta tensione prima dell'acquisto.

Step 5: Create a Technical Data Schedule for Supplier Replies

This is the part of the RFQ most worthy of standardisation.

If the buyer merely sends a statement of product requirements without requiring suppliers to provide technical data item by item, quotations will often contain a large number of vague responses, such as ‘complies with requirements’, ‘can be provided’ or ‘manufactured to standard’.

These responses are insufficient to support a technical review.

It is recommended that a Technical Data Schedule be included as an annex to the RFQ, requiring suppliers to provide actual parameters, corresponding documentation and any necessary clarifications.

Suppliers should enter actual data rather than simply copying the buyer’s requirements.

If a parameter is not applicable, enter ‘N/A’ and explain the reason; if further clarification is required, enter ‘Pending Clarification’; if it differs from the buyer’s requirements, it should be recorded in the Technical Deviation Register.

This approach enables the procurement team to identify discrepancies during the technical approval stage, rather than waiting until the order has been confirmed or production has been completed.

Step 6: Use a Technical Compliance Matrix

The Technical Compliance Matrix is used to determine whether the technical proposal submitted by the supplier meets the RFQ requirements.

It is recommended that each requirement be cross-referenced with the supplier’s declaration, supporting documentation and assessment results.

It is recommended to use the following four statuses:

• Conforme: There is sufficient documentation to support compliance with the requirements.
• Non conforme: It has been confirmed that the requirements are not met.
• Pending Clarification: Insufficient information; awaiting further details from the supplier.
• Non applicabile: It has been confirmed that this item does not apply to the current product or project.

For critical safety performance requirements, items lacking evidence should not be directly marked as ‘Compliant’.

Furthermore, supplier declarations and objective evidence should be recorded separately. Even if a supplier claims compliance, the status should remain ‘Pending Confirmation’ if the test reports or technical documentation for the relevant model are incomplete.

Step 7: Establish a Deviation Register Before Order Confirmation

The Technical Deviation Register is used to record discrepancies between the supplier’s proposal and the purchaser’s requirements.

In project procurement, a technical deviation does not necessarily mean that the supplier’s proposal is entirely unacceptable. Certain discrepancies may be resolved through technical clarification, configuration adjustments or project approval.

What must be avoided at all costs is the supplier failing to disclose discrepancies, or the procurement team tacitly accepting them without completing an assessment.

It is recommended that the RFQ explicitly require suppliers to disclose all deviations, using the table below.

For each deviation, the following questions must be answered as a minimum:

1. What are the specific differences compared to the buyer’s requirements?
2. Why has the supplier proposed this solution?
3. Does it affect the product’s suitability, performance or test evidence?
4. Does it affect price, delivery time, accessories or maintenance requirements?
5. Does the buyer accept this deviation?
6. Is it necessary to update the technical specifications, drawings or order attachments?

Technical deviations that have not been approved by an authorised person should not automatically become final supply requirements.

It is recommended that the approved deviation register be included as part of the technical annex to the contract or purchase order, and that version confirmation be completed prior to production.

Step 8: Compare Supplier Quotations on an Equal Technical Basis

When multiple suppliers submit quotations, technical criteria should first be standardised before comparing commercial terms.

The following is an example of a procurement evaluation. The suppliers and evaluation results in the table are illustrative only and do not represent actual JINPOWER clients or project records.

This example illustrates that quotation amounts cannot be compared in isolation from the technical specifications.

If a supplier’s price is lower but does not include necessary accessories, the test reports provided do not correspond to the actual model, or significant technical deviations have not been disclosed, then their quotation is not directly comparable with those offering a complete configuration.

The procurement team should first complete a technical compliance audit before comparing price, lead time, packaging, payment terms and other commercial conditions.

For project procurement, it is also essential to confirm that the final quotation, technical specifications, drawings and bill of materials are all based on the same version, to avoid changes to the actual order after technical approval has been granted.

How JINPOWER Supports High Voltage Detector RFQ Review

JINPOWER supplies electrical safety equipment for applications in the power sector, substations, power transmission and distribution, railways and industrial electrical maintenance.

For the procurement of voltage detectors, JINPOWER’s current product pages include the AC High Voltage Detector product range, as well as the DC Voltage Electroscope product range equipped with insulated operating rods. The voltage configurations, detection methods, operating rod lengths and technical documentation requirements for different products should be confirmed according to the specific model.

For example, JINPOWER’s currently published DC Voltage Electroscope with Insulated Operating Rod product range lists 0.75 kV, 1.5 kV, 4.8 kV and 10 kV DC configurations, and specifies that the product utilises an insulated FRP operating rod, equipped with audible and visual indicators and a Manual Self-Test function.

These configurations represent different product options and do not imply that a single electroscope automatically covers all the voltage ranges listed above. Purchasers must still confirm the appropriate model based on the actual DC system, test points, required operating distance and project requirements.

For AC electroscopes, it is similarly necessary to confirm the system voltage, testing principle, applicable standards, contact conditions and relevant test documentation based on the specific application. The parameters or standards of DC products must not be directly applied to AC products.

At the RFQ stage, it is recommended that customers, where possible, provide the following information:

• Project application scenario and target electrical system.
• AC or DC, and the actual rated voltage.
• Required testing range and test points.
• Specified testing principles or technical specifications.
• Whether an insulated operating pole is required.
• Target length, interface and accessory requirements.
• Applicable standards and versions.
• Requirements for test reports, markings and other technical documentation.
• Purchase quantities, delivery times and packaging requirements.

JINPOWER can assist in verifying technical specifications, the scope of supply and any matters requiring further clarification, based on the confirmed product configuration and project requirements. For testing methods or standards that have not yet been finalised, technical confirmation should be completed before proceeding to the final quotation and order approval.

To view the current product range, please visit JINPOWER Voltage Detector Product Categories.

Copyable High Voltage Detector RFQ Template

The template below can be used directly as a base version for a purchase enquiry document. The buyer may delete any fields that are not applicable based on the actual circumstances of the project and enter the confirmed technical requirements into the ‘Buyer Requirement’ column.

When using this template, it should be made clear which fields must be completed by the buyer and which by the supplier. For technical parameters that the buyer is unable to determine, the supplier may be asked to propose a solution; however, this must be reviewed and confirmed by the buyer or the project’s technical lead.

This template is intended to standardise request for quotation (RFQ) information and does not replace specific product standards, design documents or on-site safety procedures.

Common Mistakes When Preparing a High Voltage Detector RFQ

Only Stating the Voltage Rating

The voltage rating alone cannot determine the detection principle, AC/DC compatibility, detection location or the full scope of supply.

Stating Only “IEC Compliant”

This fails to specify the relevant sections and versions of the applicable standards, nor does it clarify what evidence the supplier is required to submit.

Leaving the Detection Point Undefined

Different equipment configurations and detection locations may require different detection methods, interfaces or accessories.

Ignoring the Operating Pole

If the project requires the detector to be used in conjunction with an insulated operating pole, the interfaces, length, compatibility and corresponding documentation must be confirmed.

Accepting “Comply” Without Technical Values

Suppliers should provide actual parameters and the corresponding technical documentation, rather than merely repeating the buyer’s requirements.

Failing to Request a Deviation Register

Failure to list technical deviations separately may prevent a fair comparison between proposals from different suppliers.

Comparing Prices Before Technical Review

Low-cost quotations lacking necessary accessories, test evidence or a complete configuration should not be directly compared with comprehensive technical proposals.

Changing Specifications After Approval Without Revision Control

Technical specifications, drawings, test documentation and order configurations must remain consistent. Where changes occur, their impact must be reassessed and the results of approval documented.

FAQ: High Voltage Detector RFQ Requirements

What information should be included in a High Voltage Detector RFQ?

At a minimum, the project application, AC/DC system, nominal voltage, required detection range, detection principle or solution requirements, detection location, applicable standards, operating lever and accessory configuration, test documentation, quantity and delivery time should be specified. Specific fields should be adjusted according to product type and project requirements.

Should the buyer specify the detection principle or let the supplier choose?

If the project’s technical specifications have already determined the detection principle, this should be explicitly stated in the RFQ. If it has not yet been determined, suppliers may be asked to propose solutions; however, the applicable conditions, technical basis and limitations must be specified, and these must be approved by the project’s technical lead.

Is a voltage rating sufficient to compare different detector quotations?

No. It is also necessary to compare the detection principle, system type, scope of applicable standards, product configuration, control lever compatibility, technical documentation and any deviations. Only when the technical scope is broadly consistent does a comparison of quotations hold practical significance.

What is the purpose of a Technical Compliance Matrix?

It links the buyer’s requirements, the supplier’s declarations, corresponding evidence and audit status, helping the procurement team to identify non-conformities, missing documentation and matters requiring clarification.

Why should suppliers submit a Deviation Register?

The Deviation Register enables technical discrepancies to be disclosed prior to order confirmation and records the causes, impacts and approval status, thereby preventing unauthorised alternatives from entering the final supply configuration.

Should the test report be requested before or after ordering?

It is recommended that suppliers be required to provide applicable existing test evidence during the technical approval stage, whilst clearly defining the requirements for final delivery documentation. The specific report format and submission timeline should be stipulated in the RFQ, contract and inspection plan.

Does the detector test report also serve as proof for the insulated operating pole?

Not necessarily. The detector unit and the separate insulated operating pole may require separate verification against applicable standards and technical evidence.
If both are supplied as a complete assembly, interface compatibility and the scope of certification for the complete configuration should also be confirmed.

Final Recommendation: Turn the RFQ Into a Controlled Technical Document

A valid High Voltage Detector RFQ is not merely a document through which the procurement department requests quotations from suppliers; it also serves as the basis for engineering, quality, procurement and suppliers to jointly confirm technical requirements.

It is recommended that the procurement process be standardised as follows:

Project Requirements Confirmation → RFQ Technical Specification Sheet → Supplier Technical Response → Technical Compliance Matrix → Deviation Register → Technical Approval → Commercial Comparison → Order Configuration Confirmation → Acceptance of Delivery Documentation.

Within this process, the buyer is responsible for clarifying project requirements and approving standards; the supplier is responsible for providing accurate product parameters, declarations of conformity and corresponding evidence; and technical reviewers are responsible for determining whether any deviations are acceptable.

For the procurement of voltage testers by JINPOWER, it is recommended that the AC/DC specifications, test tasks, product models, joystick configurations, applicable standards and test documentation requirements be clarified at the quotation stage. Any technical options that remain undetermined should be clarified during the quotation stage, rather than being addressed only at the production or delivery stage.

The key to procurement quality lies not in the number of quotations received, but in ensuring that each quotation corresponds to clear, verifiable and traceable technical requirements.