Engineering verification workbench

A second look at the power system you designed.

RokBench cross-checks, analyzes, compares and explains electrical designs built by engineers. It does not design for you. It tells you whether what you designed holds up. Screening tool. Not an engineering service.

Start — pick a layout ↗Browse tools Quick reference

New · Contingency study for in-plant distribution

What PSS/E-style N-1 analysis does for the grid, done for your one-line.

Load a model in the Workbench and the engine runs every credible failure — of each device, in each operating state, with protection that may not clear — and reports which loads are lost, how they come back and how often. Deterministic, catalog-driven, reproducible. Open to everyone for now.

Pick a layout like yours and run it ↗How it is computed

01Every single contingencyEach cable, breaker, transformer, bus, UPS and source fails in the ways equipment actually fails: internal fault, failure to open, failure to start, failure to transfer, room fire, shared duct bank, common fuel. Then the same again during a utility outage and during maintenance.

02Clearing and damage, not just a cutWhich device trips, whether an arcing fault even reaches the instantaneous pickup, and what gets damaged when it does not clear.

03Restoration grade per loadE1 seamless · E2 automatic transfer · E3 manual switching · E4 after repair · E5 after replacement. Critical loads pass N-1 at E2 or better; a transfer inside the load's ride-through counts as continuous supply.

04Two scores, one chartSupply reliability 0–10 from public failure-rate data (USACE TM 5-698-5), capital 0–10 from the equipment you drew. Your model sits on the same chart as 27 library topologies.

VerifyRe-check a design you already have: cable sizing, voltage drop, transformer secondary fault current.

AnalyzeRun thousands of deterministic contingency cases on your one-line and see which loads are lost, how they come back and how often.

CompareDiff two model files by node and edge, with the difference in results side by side.

ExplainEvery warning states what was found, which inputs caused it and which criterion it was measured against.

Browse by category

Full catalog →

Cables & RacewaysSizing, voltage drop, fill and conductor data.9 live Loads & Power QualityCurrent, power triangle, power factor and loading.12 live Short Circuit & ProtectionFault current, protective devices and relaying.7 live Power Sources & BackupGenerators, UPS, batteries and solar.7 live Grounding, Lightning & CorrosionElectrodes, step and touch voltage, lightning risk, cathodic protection.8 live Hazardous LocationsArea classification and protection concepts, NEC and IEC.3 live Electrical Rooms & LightingHeat dissipation, cooling and illumination.5 live Reliability & TopologySingle points of failure and resilience of the distribution.3 live Testing & MaintenanceChecklists and field test corrections.5 live Units & General ReferenceUnits, voltages, colors, ratings and terminology.5 live · 1 planned

How RokBench works

Formulas are publicEvery check has a Methods page with its formulas, assumptions and limits.
Your data stays yoursNo accounts, no stored inputs. Your model lives in the browser and in the JSON file you export.
Results are reproducibleSame input, same output. Every result records the engine version that produced it.
Errors are publishedValidation cases run against textbook examples; deviations and fixes go in the Changelog.

Start here

Engineering Notes

Load a textbook topology in the Workbench and find its single points of failure, or check a single cable in under a minute.

Workbench →
Topology, contingency study, supply reliability and capital scores, loading and batch cable checks on one model.
Cable Check →
Ampacity and running / starting voltage drop for the cable you specified.
Maintenance Checklist →
Printable checklists for six equipment types, with document pointers.
AWG to mm² →
Generated from the AWG definition, with the nearest IEC sizes.