Ampacities .com
2 416on platform
— Vol. VII · MMXXVI Spring Edition Fourteen instruments compiled, audited, and shipped from the Sydney atelier.
— Catalogue 14 instruments Each cites its primary standard inline within the calculation.
— Compliance AS/NZS · IEEE · IEC Audited annually against the latest published revisions.
— Reference ME · 2018 · UK Engineered in Surry Hills. Distributed worldwide.

Fourteen instruments for the considered engineer.

14 Calculators
07 Platform Tools
09 Standards Bodies
Est. MMXVIII Sydney
Ampacities publishes a small, deliberate suite of electrical engineering calculators — each traceable, each typeset, each cited to its governing standard.

The library covers the full lifecycle of an electrical design: cable sizing through arc-flash incident energy, earthing grids through lightning protection, fault current through battery-string sizing.

Every calculation carries a footnote in the export, naming the clause and revision used. Audit-ready by construction.

→ Compiled to AS/NZS 3008, AS/NZS 3000, IEEE 1584-2018, IEEE 80, IEC 60909, IEC 62305, IEEE C57.12, IES RP-1, IEEE 485, IEEE 446 + more.

Enter the Library→ Standards Index↘
Chapter One · The Library

The Library
of Calculation.

— Fourteen instruments · audited spring MMXXVI

The collection in full. Hover any instrument to study its cited standard. Click to enter the solver — each opens in its own page with an exportable, typeset audit trail.

— A AS/NZS Standards Australia / New Zealand Wiring rules, cable selection, lighting & supply harmonisation.
— B IEEE Institute of Electrical & Electronic Engineers Arc flash, earthing, transformers, batteries, UPS and continuity.
— C IEC International Electrotechnical Commission Short-circuit calculation, lightning protection, EMC, harmonics.
— D NEC National Electrical Code · NFPA 70 North-American conductor ampacity, tray fill and overcurrent rules.
— A small mercy

Saved calculations.

Any calculation can be saved against a project and reopened with its original inputs. The next engineer — or you, six months from now — sees the same figures, the same standard, the same footnote.

— per project ∞ reopen with inputs
Chapter Two · The Platform

Beyond the
calculation.

— Seven instruments · one studio

The library is the heart, but the studio runs on more than figures. Projects link every calculation to a client, a job, and a quote — and every hour you spend to an invoice. Built for the small electrical practice; opinionated, audited, Australian-aware.

B / 01 · Projects→
Projects
A folder for every engagement. Link the client, set a budget of hours and fees, and watch the work assemble itself.
  • Track work, end to end
  • Link client & jobs
  • Hours · fees budget
B / 02 · Jobs→
Jobs
A pipeline from first enquiry to a finished job — with notes, attached files and checklists waiting at every stage.
  • Enquiry → scheduled
  • In progress → complete
  • Notes · files · checklists
B / 03 · Clients→
Clients
A built-in CRM, light on its feet: contacts, sites, correspondence — and a thread back to every project and invoice on file.
  • Built-in CRM
  • Linked to projects
  • History · per client
B / 04 · Quotes→
Quotes
Itemised quotes that read like a proper letter — GST handled, a public acceptance link, and a one-click conversion to an invoice.
  • Line items · GST modes
  • Public accept link
  • Convert → invoice
B / 05 · Invoices→
Invoices
Issue, track and mark paid. Set a recurring schedule for the steady accounts, and let the rest send themselves.
  • Line items · GST
  • Recurring billing
  • Mark paid · audit
B / 06 · Timesheets→
Timesheets
Live timer for the work in front of you. Weekly and monthly views; duplicate last week with a click; invoice the uninvoiced.
  • Live timer · week / month
  • Duplicate week
  • Invoice uninvoiced hours
B / 07 · Business→
Business profile
Company details, ABN, payment terms, bank details and a GST flag — set once, applied to every quote and invoice you ever send.
  • ABN · GST flag
  • Payment terms
  • Bank · payout details
— The Manifesto

A discipline of cited figures.

An electrical calculation is not merely arithmetic. It is a citation — a small declaration to the next engineer, the inspector, the auditor: I obtained this number by following this rule, on this page, of this revision.

Ampacities treats every solver as an audit-ready document. The page is the calculation. The calculation is its source. Nothing is hidden behind a generic spreadsheet.

It is software for engineers who would prefer to be remembered for the figures they signed, not the figures they could not justify.

— Compliance Matrix

Specification, in brief.

SolverNewton — Raphson10⁻⁹ tol.
NumericsDouble · 64-bitIEEE 754
UnitsSI · Imperial · CGSnative
ExportPDF · LaTeX · DOCX · CSVarchival
Latency< 6 ms · per solveavg
AuditInline citation · every resultalways
ProvenanceSurry Hills, SydneyAU
We do not ship calculators. We ship the smallest possible piece of paper that can defend itself in a court of engineering.
— Iona Bourne · Principal, Ampacities · Surry Hills
Chapter Three · The Subscription

Three stations
at the bench.

— Soliste · Studio · Bureau

A small house, plainly priced. One figure per seat, monthly or annual — no quotas on calculations, only the instruments and their citations. The audition opens the full Studio tier for fourteen days; the card on file is required only when you commit.

N° I / Soliste →
Soliste.
For the single practitioner.
$39 AUD · per month or $390 paid annually
  • All fourteen instruments
  • One user · unlimited saved calculations
  • PDF export · typeset audit trail
  • AS/NZS · IEEE · IEC · NEC citations
Begin Audition→
N° II / Studio Most chosen
Studio.
For the small practice.
$29 AUD · per seat · month billed annually — or $35 / seat / month
  • Everything in Soliste
  • Projects · jobs · clients
  • Quotes · invoices · timesheets
  • Up to ten seats
  • Recurring invoicing
  • Branded PDF templates
Begin Audition→
N° III / Bureau ↘
Bureau.
For the established firm.
Sur mesure. spoken for · on request
  • Everything in Studio
  • Unlimited seats
  • SSO · SAML / OAuth
  • Audit-log export
  • White-label exports
  • Custom citation profiles
  • Priority studio support
Speak with Studio↘

All prices in AUD. GST inclusive for Australian customers; ex-GST for international. The fourteen-day audition opens the full Studio tier — no card on file.

Enter the
Atelier.

Begin a fourteen-day audition of the full library. No contract — only the calculators, the citations, and the small dignity of work done right.

Begin Audition→ Speak with Studio↘