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15 Mar, 2026
Posted by Chris Wilson
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What Information Is Required to Quote a Switchboard?

QuotingUpdated · 7 min read

What Information Is Required to Quote a Switchboard?

The information you send with an enquiry has more effect on your quote turnaround than anything we do at the workshop. Arrive with the right documents and your quote lands the same day. Arrive without them and the quote sits in a follow-up queue.

Quick answer

To quote a switchboard accurately, we need three documents at minimum: a loading schedule, a single-line diagram, and a confirmed fault level (PSCC) at the point of installation. Helpful extras: form of internal separation, IP rating, enclosure constraints, preferred platform (Logstrup, Simotrol or Schneider Prisma Plus G), and any project-specific component preferences.

Switchboard quote documents on the desk at Clive Wilson Switchboards

This guide covers what to include with a switchboard enquiry so it gets quoted cleanly and quickly. Clive Wilson Switchboards has been quoting and building LV switchboards for NZ industrial and commercial sites for over 55 years.

The three essentials we need first

  1. 1.Loading schedule: a row-by-row list of every circuit in the board, its connected load, its design current, and any diversity factor that applies. This is the single most important document; without it, we cannot size the busbars, the breakers or the enclosure.
  2. 2.Single-line diagram (SLD): the electrical architecture from incoming supply through to outgoing feeders. Shows protection devices, busbar layout, metering and any tie or coupler arrangements.
  3. 3.Confirmed fault level (PSCC): the prospective short-circuit current at the board’s point of installation, in kA. From the network operator or your consulting engineer.

With those three documents we can scope the platform, size the busbars and breakers, confirm form of separation, propose an enclosure layout, and produce a firm quote in writing.

Helpful extras that speed things up

Not strictly required, but each one of these removes a round trip and shortens turnaround:

  • Form of internal separation (Form 1, 2, 3, 4a or 4b). See our forms of segregation guide if unsure
  • IP rating for the installation environment. See our IP rating guide
  • Enclosure constraints: floor plan, doorway dimensions, ceiling height, cable entry direction (top, bottom or both)
  • Platform preference: Logstrup, Simotrol, Schneider Prisma Plus G, or open
  • Component preferences: specific breaker manufacturer, metering style, protection relay brand
  • Project timeline: required FAT date and site delivery date
  • Labelling and engraving requirements: we can supply Traffolyte or laser-engraved labels through our in-house engraving line
Builder’s note: Attach the loading schedule and SLD to the first email rather than promising to send them separately. Every extra round trip adds a day or two to the quote. Three round trips can easily cost a week.

What happens when information is missing?

Without the three essentials we can still respond, but the quote will either be a budget range with assumptions called out, or a written request for the missing items before pricing.

If PSCC is open, we usually scope for a typical kA range and flag that the final number sets the breaker selection. If the loading schedule is incomplete, we can scope from a draft schedule but the quote will note which feeders are subject to confirmation.

For projects where the engineering information is still in flight, our in-house consulting and design team can help work through the loading schedule, fault calculation and SLD.

Pre-enquiry checklist

Before sending an enquiry, run through this short list. Each item answered shortens the turnaround:

  • Loading schedule attached
  • Single-line diagram attached
  • PSCC stated in kA (or noted as TBC with expected range)
  • Form of internal separation specified or noted as TBC
  • Required IP rating stated
  • Enclosure constraints (footprint, doorway, cable entry) stated
  • Project timeline given (FAT date, site delivery date)
  • Any specific component or platform preferences noted

A complete enquiry packs gets a same-day or next-day quote. An incomplete one starts a back-and-forth that can add a week before pricing is even possible. The difference is in the information, not the workshop.

Frequently asked questions

Can you quote without a single-line diagram?+

We can give a budget range based on the loading schedule alone, but a firm quote needs the SLD. The architecture of the board (tie arrangements, sub-board feeders, metering structure) directly affects the busbar layout and the enclosure size.

What if the PSCC has not been confirmed yet?+

We can scope to a typical kA range and flag that the final PSCC drives breaker selection. The network operator or consulting engineer should be confirming PSCC in parallel; until they do, the quote includes a note that the kA rating is subject to confirmation.

How quickly do you turn around a quote?+

Same-day or next-day for a complete enquiry pack on a standard switchboard. Larger or more complex projects (multi-section MSBs, large MCCs) may take a day or two longer for the engineering review. Missing information adds time.

Can you help develop the loading schedule and SLD?+

Yes. Our in-house consulting and design team uses EPLAN Electric P8 and EPLAN Pro Panel to produce single-line diagrams, GA drawings and loading schedules from a brief.

What is the difference between a budget quote and a firm quote?+

A budget quote is an indicative price based on a partial information pack, with assumptions called out. A firm quote is the price we will build to, based on a complete information pack and locked-in scope.

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Next step

Ready to send your enquiry?

Attach your loading schedule, single-line diagram and confirmed fault level. We will scope the board and quote in writing.

Phone: 03 214 4264
Email: admin@clivewilson.co.nz

Request a Quote →

Reviewed by Chris Wilson, Co-Director, Clive Wilson Switchboards. Registered electrician, 15+ years in LV switchboards. Updated May 2026.

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