What does a contractor check before specifying switchgear or panels?
Answer
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.
Information to make clear
Use the fields that affect this buying decision. Leave unsupported claims out.
- Equipment type
- Distribution boards, motor control centres, switchboards and panels differ.
- Rated current and voltage
- The basic electrical specification.
- Short-circuit withstand rating
- The safety specification the installation depends on.
- Assembly standard and verification route
- How the design is proved.
- Ingress and impact protection rating
- Determines the installation environment.
- Form of separation
- Governs maintenance safety and access.
- Component brands used
- Contractors and end users have strong preferences.
Documents to prepare
State what can be published, shared on request or issued with an order.
| Document | What it supports | Suggested handling |
|---|---|---|
| Type test or design verification reportMay be requested at: specification and approval | That the assembly design meets the assembly standard | Publish |
| Routine test certificateMay be requested at: every assembly, at handover | Tests performed on the delivered assembly | Issue per shipment |
| Short-circuit withstand documentationMay be requested at: design approval | The rating and how it was verified | Publish |
| Declaration of ConformityMay be requested at: before installation | Conformity with the applicable directives | Publish |
| Component datasheets and scheduleMay be requested at: maintenance planning | What is actually inside the assembly | Publish |
| As-built drawings and schematicsMay be requested at: handover | The record the maintenance team will rely on | Publish |
| Ingress protection test evidenceMay be requested at: environmental suitability | Verified protection rating for the enclosure | Share on request |
Details to ask in an enquiry
Collect only the information needed to assess the request and respond.
- 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.
Related questions
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.
This is an editorial checklist, not a compliance standard. Requirements vary by market, customer and contract. Confirm current requirements with the responsible technical and commercial teams.
Plact Research. Plact's editorial desk for buyer-evidence guides. The guides organize common buyer questions, documents and enquiry fields. Requirements should be checked against current standards, regulations and contracts.