This is what a buyer checks before they shortlist a electrical and electronics supplier.

What does a contractor check before specifying switchgear or panels?

They check the short-circuit withstand rating against the fault level, whether the assembly is type tested or verified to the assembly standard, and the protection rating. Fault rating is a safety specification, so it is checked before anything commercial.

An electrical contractor is specifying equipment that must survive a fault and satisfy an inspecting engineer.

Reviewed 4 August 2026 · Written for electrical equipment manufacturers selling to business buyers

Buyer asks

What does a contractor check before specifying switchgear or panels?

Illustrative. The question is real; it is the one this guide answers.
WHAT THEY NEED TO BELIEVEWHAT SETTLES ITWHEN THEY ASKThat the assembly design m…Type test or design verific…Specification and appro…Tests performed on the del…Routine test certificateEvery assembly, at hand…The rating and how it was…Short-circuit withstand doc…Design approval
Every claim on a supplier site has a document behind it or it does not. Buyers in electrical equipment know which is which.

What a buyer needs to identify the product

These are the fields a buyer scans before deciding whether you are worth contacting. Missing one of them usually ends the visit without an email.

  1. 1

    Equipment type

    Distribution boards, motor control centres, switchboards and panels differ.

  2. 2

    Rated current and voltage

    The basic electrical specification.

  3. 3

    Short-circuit withstand rating

    The safety specification the installation depends on.

  4. 4

    Assembly standard and verification route

    How the design is proved.

  5. 5

    Ingress and impact protection rating

    Determines the installation environment.

  6. 6

    Form of separation

    Governs maintenance safety and access.

  7. 7

    Component brands used

    Contractors and end users have strong preferences.

The documents buyers ask for

Not all of them belong on a public page. Naming the ones you can issue is what separates a supplier who can be audited from one who cannot.

Documents buyers ask a electrical equipment manufacturer for, what each proves, and whether it belongs on the public site
DocumentWhat it provesWhere it belongs
Type test or design verification reportAsked at: specification and approvalThat the assembly design meets the assembly standardPublish it
Routine test certificateAsked at: every assembly, at handoverTests performed on the delivered assemblyPer shipment
Short-circuit withstand documentationAsked at: design approvalThe rating and how it was verifiedPublish it
Declaration of ConformityAsked at: before installationConformity with the applicable directivesPublish it
Component datasheets and scheduleAsked at: maintenance planningWhat is actually inside the assemblyPublish it
As-built drawings and schematicsAsked at: handoverThe record the maintenance team will rely onPublish it
Ingress protection test evidenceAsked at: environmental suitabilityVerified protection rating for the enclosureName it, share on request

Where electrical equipment sites lose the enquiry

Each of these is common, cheap to fix, and costs an enquiry that never arrives — so nobody ever reports it.

  • Verification route not stated

    Assembly standards allow different verification routes and inspectors ask which was used. Ambiguity here delays energisation.

  • Short-circuit rating omitted

    It is a safety specification tied to the installation's fault level. A panel without it cannot be approved.

  • Component brands not disclosed

    End users standardise on components for spares and maintenance. Concealing what is inside suggests the cheapest available parts.

What the enquiry form should ask

A form that collects these can be answered properly the first time. A form that collects a name and a message cannot.

Enquiry form — electrical equipment

Enough to reply usefully, short enough that a buyer finishes it.

Application and installation type
Determines the equipment class.
Rated current and fault level
The core safety specification.
Protection and form of separation required
Set by the specification.
Component preferences
End users frequently mandate brands.
Environment
Indoor, outdoor and corrosive settings change construction.
Drawings and programme dates
Panel build sits on the critical path.

Questions suppliers ask

How should verification of an assembly be explained?

By naming the standard, the verification route used and what evidence exists. Inspecting engineers ask precisely this, and being able to point to a published answer shortens approval and distinguishes you from panel builders who cannot answer it at all.

Do buyers care which components are inside?

End users care intensely, because spares, maintenance familiarity and support all follow the component brand. Publishing the brands you build with attracts the buyers who have standardised on them and avoids disputes discovered at handover.

What documentation matters most at handover?

As-built drawings and a component schedule that match what was actually installed. Maintenance teams live with this documentation for decades, and a panel builder known for accurate as-built records is remembered when the next project comes.

Documents and standards named here are the ones buyers in this industry commonly ask for; requirements vary by market, customer and contract, so treat this as a starting checklist rather than a compliance list. Clearer pages can help discovery and evaluation. They do not guarantee rankings, AI citations, enquiries or revenue.

Illustrative

An enquiry from this search looks like: Component preferences · Drawings and programme dates · Application and installation type · Rated current and fault level

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