Size it, spec it, check your work
Twenty calculators that show their method, eighteen guides that answer one question each, and open boards for practising one-lines, power PODs and rack elevations.
Three ways in
Most people arrive with one of three questions. Each of these opens onto the rest.
Work it out
Twenty calculators — voltage drop, transformer sizing, arc-flash incident energy, cable ampacity, fault current — each showing the method, not just the answer.
Understand it
Eighteen guides, each written to answer a single question — how a nameplate reads, what an arc-flash boundary is, why PUE lies to you — plus a plain-language glossary.
Practise it
Open boards for laying out real equipment — a one-line, a packaged power module, a rack elevation — with the result checked against sizing, load and code rules as you build.
Get it wrong here, not on site
Three open boards for laying out real equipment and having the result checked against sizing, load and code rules — with 32 procedural 3D models of the actual kit behind them.
Five sectors of power equipment
Each opens onto the guides, reference specifications and standards for that sector.
Data centers
Transformers, switchgear, generators, UPS, CDUs and busway for hyperscale and colo builds.
Renewables
Modules, inverters, trackers, GSUs and balance of system for solar, wind and hybrid sites.
Battery storage
DC blocks, PCS, BMS, EMS, fire suppression and thermal management for utility-scale BESS.
Oil & gas
Wellheads, BOPs, tubulars, artificial lift and fittings — new, rebuilt or recertified.
Industrial supply
Fasteners, raw stock, tools, safety gear, motors and plumbing — materials, grades and standards reference.
Guides that answer one question each
No overviews, no listicles. Each one takes a single thing engineers actually get asked and works through it properly.
How to Read a Transformer Nameplate
kVA ratings, cooling class codes, impedance, BIL and vector group: what every field means, and which ones decide the rest of your design.
Transformers & substationArc-Flash Boundary Basics
What an arc-flash boundary is, how it relates to incident energy, and what NFPA 70E requires on equipment labels.
Switchgear & protectionGrounding & Bonding Basics
They do two different jobs. What each actually does, and why the equipment grounding conductor is not the neutral.
Switchgear & protectionShort-Circuit Studies & Breaker Coordination
What a short-circuit study calculates, why a quick fault-current estimate is not a substitute, and how coordination follows from it.
Switchgear & protectionPUE Explained
The formula, what counts as facility power, typical ranges from 1.1 to 2.0, and what actually drives the number.
Data center power & coolingLiquid vs Air Cooling for AI Racks
Why GPU rack density is pushing data centers to liquid: direct-to-chip, immersion and rear-door heat exchangers compared.
Data center power & coolingNot sure what you need yet?
The tools hub lists everything on the site in one place — every calculator, every practice board, the glossary quiz and the PCB builder. Nothing needs an account.
Browse all free toolsWhere the numbers come from
Every figure on the site carries a basis, and the methodology page sets out how each is derived, what it is good for, and where it should not be relied on.
Read the methodology